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These \u003cstrong\u003eM3 aluminum alloy countersunk bolts\u003c\/strong\u003e solve that. The hex socket drive gives you a solid grip without stripping, and the anodized surface resists corrosion while letting you choose from ten vibrant colors. Whether you’re assembling an aerospace model, tuning a golf club head, or modding computer accessories, these flat-head screws sit flush – no snagging, no ugly hardware.\u003c\/p\u003e\n\u003ch3\u003e✨ Why These M3 Allen Socket Screws Stand Out\u003c\/h3\u003e\n\u003cul class=\"hdiy-feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnodized aluminum alloy\u003c\/strong\u003e – Excellent corrosion resistance and rust prevention. Your \u003cstrong\u003eM3 countersunk bolts\u003c\/strong\u003e stay bright and functional even after repeated handling or exposure to humidity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 vibrant colors available\u003c\/strong\u003e – Dark red, rose red, gold, royal blue, sky blue, black, silver, green, purple, and orange. Match your DIY model or high-end bicycle frame perfectly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide application range\u003c\/strong\u003e – From aerospace industry and aviation model toys to aluminum bike frames, golf heads, mechanical equipment, mold processing, and computer mods. These \u003cstrong\u003eAllen socket screws\u003c\/strong\u003e fit right in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountersunk head design\u003c\/strong\u003e – Sits flush with the surface for a clean, professional look. No protruding heads that catch on cables or skin.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision tolerance (±0.3mm)\u003c\/strong\u003e – Consistent threading and dimensions mean you won’t fight with cross-threading or loose fits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e📏 Technical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Name\u003c\/th\u003e\n\u003ctd\u003eM3 Aluminum Alloy Countersunk Bolt – Allen Socket Head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eScrew Size\u003c\/th\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk (Flat Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eHex Allen Socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eAnodized (Corrosion \u0026amp; Oxidation Resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColors Available\u003c\/th\u003e\n\u003ctd\u003eDark Red, Rose Red, Gold, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Orange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTolerance Range\u003c\/th\u003e\n\u003ctd\u003e±0.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eAerospace models, bicycle frames, golf heads, mechanical equipment, mold processing, and computer accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003e❓ Frequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔩 Will these M3 countersunk bolts work with standard M3 nuts or threaded holes?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eYes – they follow standard M3 metric thread pitch (0.5mm). They fit any standard M3 nut, tapped hole, or threaded insert. The ±0.3mm tolerance ensures smooth engagement without being too tight or loose.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🎨 Are the colors anodized or just painted? Will they scratch off?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThe color is from an anodizing process, not surface paint. Anodizing bonds the dye into the aluminum oxide layer, so it’s much more durable than paint. Normal handling and tool contact won’t easily remove it. However, hard impacts or heavy abrasion may leave marks – treat them like any quality aluminum hardware.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e⚙️ Can I use these on a high-stress application like a bicycle stem or motor mount?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThese are aluminum alloy screws, which are lighter but not as strong as steel. For high-torque or safety-critical parts (e.g., brake mounts, steering components), we recommend steel hardware. But for fairings, battery covers, non-structural brackets, and visual accents on bike frames, they work great.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e📦 What length are these M3 countersunk screws? The spec only shows M3 size.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eWe offer various lengths (e.g., 4mm, 6mm, 8mm, 10mm, 12mm, 16mm, 20mm). Please check the variant dropdown above for available lengths in each color. If you need a specific length not listed, just message our support team – we’ll try to source it for you.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🛠️ What Allen key do I need for the hex socket?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThese M3 countersunk Allen screws require a 2.5mm hex key (or 2.5mm Allen wrench). A standard ball-end or long-arm hex driver works perfectly. Avoid using worn or undersized keys to prevent rounding the socket.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🚚 Do you ship mixed color packs?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eYes – you can order individual colors per pack, or contact us for custom mixed-color assortments. Our customer service team will help you put together exactly what your DIY model project needs.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Royal Blue \/ M3 x 6mm","offer_id":51330437284114,"sku":"LRP12953x1","price":2.5,"currency_code":"USD","in_stock":true},{"title":"Green \/ M3 x 6mm","offer_id":51330437316882,"sku":"LRP12954x1","price":2.5,"currency_code":"USD","in_stock":true},{"title":"Golden \/ M3 x 6mm","offer_id":51330437349650,"sku":"LRP12955x1","price":2.5,"currency_code":"USD","in_stock":true},{"title":"Dark Red \/ M3 x 6mm","offer_id":51330437382418,"sku":"LRP12956x1","price":2.5,"currency_code":"USD","in_stock":true},{"title":"Black \/ M3 x 6mm","offer_id":51330437415186,"sku":"LRP12957x1","price":2.5,"currency_code":"USD","in_stock":true},{"title":"Silver \/ M3 x 6mm","offer_id":51330437447954,"sku":"LRP12958x1","price":2.5,"currency_code":"USD","in_stock":true},{"title":"Purple \/ M3 x 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Surface Treatment Anodize\u003cbr\u003e\n● 【widely used】：Aerospace industry, aviation model toy accessories, production of high-end aluminum alloy bicycle frames, golf heads, mechanical equipment, mold processing, computer accessories, etc\u003cbr\u003e\n● 【Vibrant Colors】 ：Add style and uniqueness to your project with our colored aluminum screws. Available in a variety of vibrant colors, they are perfect for enhancing the visual appeal of your piece. \u003cbr\u003e\n●【 Exceptional Customer Service】 : We take pride in providing excellent customer support. If you have any questions or concerns, our friendly and knowledgeable team is always ready to assist you.\u003cbr\u003e\n● Material:aluminum Alloy\u003cbr\u003e\n● Screw Size:M4\u003cbr\u003e\n● Head Style:countersunk\u003cbr\u003e\n● Color:dark Red\/Rose Red\/Golden\/Royal Blue\/Sky Blue\/Black\/Silver\/Green\/Purple\/Orange\u003cbr\u003e\n● Tolerance Range: ± 0.3mm\u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Dark Red \/ M4 x 6mm","offer_id":51330440266002,"sku":"LRP13043x1","price":2.57,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M4 x 6mm","offer_id":51330440298770,"sku":"LRP13044x1","price":2.68,"currency_code":"USD","in_stock":true},{"title":"Golden \/ M4 x 6mm","offer_id":51330440331538,"sku":"LRP13045x1","price":2.57,"currency_code":"USD","in_stock":true},{"title":"Royal Blue \/ M4 x 6mm","offer_id":51330440364306,"sku":"LRP13046x1","price":2.57,"currency_code":"USD","in_stock":true},{"title":"Sky Blue \/ M4 x 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25mm","offer_id":51330442690834,"sku":"LRP13117x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Dark Red \/ M4 x 25mm","offer_id":51330442723602,"sku":"LRP13118x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Black \/ M4 x 25mm","offer_id":51330442756370,"sku":"LRP13119x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Silver \/ M4 x 25mm","offer_id":51330442789138,"sku":"LRP13120x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Purple \/ M4 x 25mm","offer_id":51330442821906,"sku":"LRP13121x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M4 x 25mm","offer_id":51330442854674,"sku":"LRP13122x1","price":3.04,"currency_code":"USD","in_stock":true},{"title":"Sky Blue \/ M4 x 25mm","offer_id":51330442887442,"sku":"LRP13123x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Royal Blue \/ M4 x 30mm","offer_id":51330442920210,"sku":"LRP13124x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Green \/ M4 x 30mm","offer_id":51330442952978,"sku":"LRP13125x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Golden \/ M4 x 30mm","offer_id":51330442985746,"sku":"LRP13126x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Dark Red \/ M4 x 30mm","offer_id":51330443018514,"sku":"LRP13127x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Black \/ M4 x 30mm","offer_id":51330443051282,"sku":"LRP13128x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Silver \/ M4 x 30mm","offer_id":51330443084050,"sku":"LRP13129x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Purple \/ M4 x 30mm","offer_id":51330443116818,"sku":"LRP13130x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M4 x 30mm","offer_id":51330443149586,"sku":"LRP13131x1","price":3.04,"currency_code":"USD","in_stock":true},{"title":"Sky Blue \/ M4 x 30mm","offer_id":51330443182354,"sku":"LRP13132x1","price":2.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/1_4_ab48ba1e-069e-403d-ac97-668fdde27578.jpg?v=1762200646"},{"product_id":"m5-aluminum-alloy-countersunk-allen-socket-screws-anodized-9-colors","title":"M5 Aluminum Alloy Countersunk Allen Socket Screws – Anodized, 9 Colors, 6–30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM5 Aluminum Alloy Countersunk Allen Socket Screws — Anodized, 9 Colors, 6–30mm, ±0.3mm Tolerance\u003c\/h2\u003e\n    \u003cp\u003eStandard steel countersunk screws add unnecessary weight and corrode over time in precision builds — a real problem in aerospace models, high-end bicycle frames, and mechanical equipment where every gram and every surface finish matters. These anodized aluminum M5 countersunk Allen socket screws deliver a flush, clean installation with a fraction of the weight of steel, in 9 vibrant anodized colors to match or accent your build.\u003c\/p\u003e\n    \u003cp\u003eMachined from high-strength aluminum alloy with an anodized surface treatment, each screw features a countersunk (flat) head for flush-mount installation and an Allen (hex socket) drive for precise torque application with a standard hex key. Available in 9 anodized colors — Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, and Purple — and thread lengths from 6mm to 30mm (M5 thread). Tolerance: ±0.3mm.\u003c\/p\u003e\n    \u003cp\u003eThese M5 countersunk Allen socket screws are widely used in aerospace industry components, aviation and RC model toy accessories, high-end aluminum alloy bicycle frames, golf club heads, mechanical equipment, mold processing, computer accessories, and general DIY precision builds where a flush, lightweight, corrosion-resistant fastener is required.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e✅\u003c\/span\u003e\n    Compatible with M5 metric threaded holes. Available in 8 thread lengths: 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, and 30mm. Requires a standard M5 hex (Allen) key for installation. Tolerance: ±0.3mm.\n  \u003c\/div\u003e\n\n  \u003cdiv\u003e\n    \u003ch2\u003e✅ Key Features of These M5 Aluminum Countersunk Allen Socket Screws\u003c\/h2\u003e\n    \u003cul class=\"hdiy-features\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eHigh-Strength Aluminum Alloy — Lightweight \u0026amp; Corrosion Resistant:\u003c\/strong\u003e Machined from high-strength aluminum alloy that provides excellent corrosion resistance and rust prevention, ensuring long-lasting durability in both indoor and outdoor precision build applications.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003e9 Anodized Color Options:\u003c\/strong\u003e Available in Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, and Purple anodized finishes. Color-match your build, color-code different fastener zones, or add a custom accent to your project.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eCountersunk Head for Flush-Mount Installation:\u003c\/strong\u003e The flat countersunk head sits flush with or below the surface of the material, creating a clean, snag-free finish ideal for aerodynamic surfaces, bicycle frames, model components, and any application where a protruding head is unacceptable.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔐\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eAllen (Hex Socket) Drive for Precise Torque:\u003c\/strong\u003e The internal hex socket drive allows precise torque application with a standard Allen key, reducing the risk of cam-out and surface damage compared to Phillips or slotted drives — important in precision aluminum builds where thread stripping must be avoided.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003e8 Thread Lengths — 6mm to 30mm:\u003c\/strong\u003e Available in 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, and 30mm thread lengths, covering a wide range of material thicknesses and stack-up requirements in precision mechanical and model building applications.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003e±0.3mm Precision Tolerance:\u003c\/strong\u003e Consistent thread dimensions and head geometry ensure reliable fit and flush seating across all M5 countersunk holes in standard aluminum, composite, and plastic components.\u003c\/span\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-usecases\"\u003e\n    \u003ch2\u003e🎯 Who Is This For?\u003c\/h2\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e✈️\u003c\/span\u003e\n      \u003cstrong\u003eRC \u0026amp; Aviation Model Builders\u003c\/strong\u003e\n      \u003cp\u003eIdeal for aerospace industry components, aviation model toy accessories, and RC builds where lightweight, flush-mount fasteners are required to reduce weight and maintain aerodynamic surfaces.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🚴\u003c\/span\u003e\n      \u003cstrong\u003eBicycle Frame \u0026amp; Sports Equipment Builders\u003c\/strong\u003e\n      \u003cp\u003eUsed in high-end aluminum alloy bicycle frames and golf club head assembly where flush-mount, corrosion-resistant, lightweight fasteners are needed for both performance and aesthetics.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🔧\u003c\/span\u003e\n      \u003cstrong\u003eMechanical Equipment \u0026amp; Mold Processors\u003c\/strong\u003e\n      \u003cp\u003eSuitable for mechanical equipment assembly, mold processing, and computer accessories where precise, flush-mount M5 fasteners with consistent tolerances are required for reliable component alignment.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🎨\u003c\/span\u003e\n      \u003cstrong\u003eDIY Makers \u0026amp; Custom Builders\u003c\/strong\u003e\n      \u003cp\u003ePerfect for any DIY precision build, custom enclosure, or fabrication project where a lightweight, anodized color-matched countersunk screw adds both function and visual appeal to the finished piece.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy (Anodized)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk (Flat Head, Flush Mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eAllen (Hex Socket \/ Internal Hex)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, 30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Colors\u003c\/th\u003e\n\u003ctd\u003eDark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple (anodized)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eAnodizing\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTolerance\u003c\/th\u003e\n\u003ctd\u003e±0.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003eAerospace models, RC toys, bicycle frames, golf club heads, mechanical equipment, mold processing, computer accessories, DIY precision builds\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread size are these countersunk screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese countersunk Allen socket screws are M5 metric thread. They are available in 8 thread lengths: 6mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm, and 30mm. Select your preferred color and length from the variant options above.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat drive type do these screws use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese screws use an Allen (hex socket \/ internal hex) drive. A standard M5 hex key (Allen key) is required for installation. The internal hex drive allows precise torque application and reduces the risk of cam-out compared to Phillips or slotted drives.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWill the head sit flush with the surface?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These are countersunk (flat head) screws designed to sit flush with or below the surface of the material when installed in a properly countersunk hole. This creates a clean, snag-free finish suitable for aerodynamic surfaces, bicycle frames, and precision model components.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these screws lighter than steel countersunk screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Aluminum alloy is significantly lighter than steel — typically about one-third the weight for the same volume. This makes these screws well-suited for weight-sensitive applications such as RC models, aviation accessories, and bicycle frames where reducing fastener weight contributes to overall performance.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWill the anodized color fade or chip over time?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe anodized finish is integrated into the surface of the aluminum rather than applied as a paint or coating, making it generally more resistant to fading and chipping than painted alternatives under normal use conditions.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the tolerance on these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese M5 countersunk Allen socket screws are manufactured to a tolerance of ±0.3mm on thread length and head dimensions, ensuring consistent fit across standard M5 countersunk holes in aluminum, composite, and plastic components.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eAre all 9 colors available in all 8 lengths?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMost color and length combinations are available. Select your preferred color and thread length from the variant dropdowns above to confirm availability. Note that not all color\/length combinations may be listed — check the variant selector for the full available range.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Color and Thread Diameter x Length above, then add to cart.\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Dark Red \/ M5 x 6mm","offer_id":51330443706642,"sku":"LRP13133x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M5 x 6mm","offer_id":51330443739410,"sku":"LRP13134x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Golden \/ M5 x 6mm","offer_id":51330443772178,"sku":"LRP13135x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"Royal Blue \/ M5 x 6mm","offer_id":51330443804946,"sku":"LRP13136x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"Sky Blue \/ M5 x 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12mm","offer_id":51330444755218,"sku":"LRP13165x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"Purple \/ M5 x 12mm","offer_id":51330444787986,"sku":"LRP13166x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M5 x 12mm","offer_id":51330444820754,"sku":"LRP13167x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Sky Blue \/ M5 x 12mm","offer_id":51330444853522,"sku":"LRP13168x1","price":2.72,"currency_code":"USD","in_stock":true},{"title":"Dark Red \/ M5 x 15mm","offer_id":51330444886290,"sku":"LRP13169x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M5 x 15mm","offer_id":51330444919058,"sku":"LRP13170x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Golden \/ M5 x 15mm","offer_id":51330444951826,"sku":"LRP13171x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Royal Blue \/ M5 x 15mm","offer_id":51330444984594,"sku":"LRP13172x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Sky Blue \/ M5 x 15mm","offer_id":51330445017362,"sku":"LRP13173x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Black \/ M5 x 15mm","offer_id":51330445050130,"sku":"LRP13174x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Silver \/ M5 x 15mm","offer_id":51330445082898,"sku":"LRP13175x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Green \/ M5 x 15mm","offer_id":51330445115666,"sku":"LRP13176x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Purple \/ M5 x 15mm","offer_id":51330445148434,"sku":"LRP13177x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Dark Red \/ M5 x 20mm","offer_id":51330445181202,"sku":"LRP13178x1","price":2.86,"currency_code":"USD","in_stock":true},{"title":"Rose Red \/ M5 x 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Encapsulated styles for Shopify product description\n ======================== *\/\n .hd-csk-wrapper {\n width: 100%;\n margin: 0;\n padding: 0;\n box-sizing: border-box;\n font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n color: #1a1a1a;\n line-height: 1.5;\n background: transparent;\n }\n .hd-csk-wrapper *,\n .hd-csk-wrapper *::before,\n .hd-csk-wrapper *::after {\n box-sizing: inherit;\n }\n .hd-csk-container {\n max-width: 1400px;\n margin: 0 auto;\n padding: 1.5rem 1rem;\n background: #ffffff;\n }\n .hd-csk-title {\n font-size: 1.9rem;\n font-weight: 600;\n margin: 0 0 0.5rem 0;\n letter-spacing: -0.01em;\n line-height: 1.2;\n color: #0a0a0a;\n }\n .hd-csk-brand {\n font-size: 1rem;\n color: #2c7da0;\n margin-bottom: 1rem;\n font-weight: 500;\n display: inline-block;\n background: #eef4fc;\n padding: 0.2rem 0.8rem;\n border-radius: 30px;\n }\n .hd-csk-section-title {\n font-size: 1.6rem;\n font-weight: 600;\n margin: 1.8rem 0 1rem 0;\n padding-bottom: 0.5rem;\n border-bottom: 3px solid #2c7da0;\n display: inline-block;\n color: #0b3b4f;\n }\n .hd-csk-description {\n font-size: 1rem;\n margin: 1rem 0 1.2rem;\n color: #2c2c2c;\n }\n .hd-csk-features-list {\n list-style: none;\n padding: 0;\n margin: 1.2rem 0 1.8rem;\n }\n .hd-csk-features-list li {\n padding: 0.75rem 0 0.75rem 1.8rem;\n position: relative;\n font-size: 1rem;\n border-bottom: 1px solid #f0f0f0;\n }\n .hd-csk-features-list li:last-child {\n border-bottom: none;\n }\n .hd-csk-features-list li::before {\n content: \"✅\";\n position: absolute;\n left: 0;\n top: 0.75rem;\n font-size: 1rem;\n }\n .hd-csk-table-wrapper {\n overflow-x: auto;\n margin: 1.5rem 0 1rem;\n border-radius: 16px;\n border: 1px solid #e2e8f0;\n background: #ffffff;\n }\n .hd-csk-specs-table {\n width: 100%;\n border-collapse: collapse;\n font-size: 0.9rem;\n min-width: 500px;\n }\n .hd-csk-specs-table th,\n .hd-csk-specs-table td {\n padding: 0.9rem 0.8rem;\n text-align: left;\n border-bottom: 1px solid #e9ecef;\n }\n .hd-csk-specs-table th {\n background-color: #f1f9fe;\n font-weight: 700;\n color: #0b3b4f;\n font-size: 0.9rem;\n }\n .hd-csk-specs-table tr:last-child td {\n border-bottom: none;\n }\n .hd-csk-note {\n background: #f8fafc;\n padding: 0.8rem 1rem;\n border-radius: 12px;\n font-size: 0.85rem;\n color: #2c5a74;\n margin: 0.8rem 0 1rem;\n border-left: 4px solid #2c7da0;\n }\n .hd-csk-faq-item {\n margin-bottom: 1.5rem;\n border-bottom: 1px solid #e9ecef;\n padding-bottom: 1.2rem;\n }\n .hd-csk-faq-question {\n font-weight: 700;\n font-size: 1.05rem;\n margin: 0 0 0.5rem 0;\n color: #0f4c5f;\n display: flex;\n align-items: center;\n gap: 8px;\n }\n .hd-csk-faq-question::before {\n content: \"🔩\";\n font-size: 1.1rem;\n }\n .hd-csk-faq-answer {\n font-size: 0.95rem;\n color: #2d3e50;\n line-height: 1.5;\n margin-left: 1.2rem;\n }\n @media (max-width: 768px) {\n .hd-csk-container {\n padding: 1rem 0.9rem;\n }\n .hd-csk-title {\n font-size: 1.6rem;\n }\n .hd-csk-section-title {\n font-size: 1.4rem;\n }\n .hd-csk-specs-table th,\n .hd-csk-specs-table td {\n padding: 0.7rem 0.5rem;\n font-size: 0.8rem;\n }\n }\n .hd-csk-divider {\n height: 1px;\n background: #e9ecef;\n margin: 1.5rem 0;\n }\n .hd-csk-text-small {\n font-size: 0.85rem;\n color: #5a6874;\n }\n \u003c\/style\u003e\n\u003cdiv class=\"hd-csk-wrapper\"\u003e\n\u003cdiv class=\"hd-csk-container\"\u003e\n\u003c!-- Product title (customer-facing) --\u003e\n\u003ch1 class=\"hd-csk-title\"\u003e🔩 A2 Stainless Steel Countersunk Socket Screws – Allen Key Flat Head Bolts M3 to M8 | DIN7991\u003c\/h1\u003e\n\u003cdiv class=\"hd-csk-brand\"\u003e🏷️ Brand: HomeDIYer Fastener | DIN7991 | A2-70 | Fully Threaded | Hex Bits Included\u003c\/div\u003e\n\u003c!-- Product Overview: natural, solution-oriented --\u003e\n\u003cdiv class=\"hd-csk-description\"\u003e\n\u003cstrong\u003e📌 Overview — Flush-fit fastening with high torque capability.\u003c\/strong\u003e When you need a completely smooth surface with no protruding heads, our \u003cstrong\u003eA2 Stainless Steel Countersunk Socket Screws (DIN7991)\u003c\/strong\u003e are the answer. The 90° flat head sits flush with or below the workpiece surface when used in a countersunk hole, providing a clean, snag-free finish. The hex socket drive (Allen key) allows high torque without cam-out, while the A2-70 stainless steel construction resists rust and corrosion – ideal for marine hardware, decking, machinery guards, furniture, and any application where a smooth surface is critical. Fully threaded from M3 to M8, these screws are measured overall (including the head). We include the correct hex screwdriver bits with your order. Choose your exact length and quantity – perfect for builders, woodworkers, and industrial assemblers.\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-description\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/KAY019_9.jpg?v=1776762825\" alt=\"\"\u003e\u003c\/div\u003e\n\u003c!-- Features: vertical list for SEO \u0026 readability --\u003e\n\u003ch2 class=\"hd-csk-section-title\"\u003e✨ Key Features of Countersunk Socket Screws (DIN7991)\u003c\/h2\u003e\n\u003cul class=\"hd-csk-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountersunk 90° Flat Head\u003c\/strong\u003e – Sits flush with or below the surface when installed in a countersunk hole – no snagging, no protruding heads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex Socket Drive (Allen Key)\u003c\/strong\u003e – Enables high torque transfer without cam-out; hex bits included with your order (2mm to 5mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA2-70 Stainless Steel (304 equivalent)\u003c\/strong\u003e – Excellent corrosion resistance for outdoor, marine, and industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Threaded (DIN7991)\u003c\/strong\u003e – Threads run the entire length for maximum grip; length is measured overall (includes head).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric Coarse Threads M3–M8\u003c\/strong\u003e – Standard pitches: M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUntreated Natural Stainless Finish\u003c\/strong\u003e – Clean, smooth surface with no coatings to chip or peel – professional appearance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Length Options\u003c\/strong\u003e – Order any overall length you need, from short (6mm) to longer (50mm+), fully threaded throughout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/KAY019_7.jpg?v=1776762825\" alt=\"\"\u003e\u003c\/p\u003e\n\u003c!-- Specifications Table: detailed dimensions --\u003e\n\u003ch2 class=\"hd-csk-section-title\"\u003e📏 Technical Specifications – Countersunk Socket Screws (DIN7991, Metric Coarse)\u003c\/h2\u003e\n\u003cdiv class=\"hd-csk-table-wrapper\"\u003e\n\u003ctable class=\"hd-csk-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n\u003cth\u003eAllen Key Size (mm)\u003c\/th\u003e\n\u003cth\u003eHead Diameter (mm)\u003c\/th\u003e\n\u003cth\u003eHead Height (mm)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e2.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e4.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e4.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e6.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-note\"\u003e💡 \u003cstrong\u003eLength \u0026amp; ordering info:\u003c\/strong\u003e Screws are \u003cstrong\u003efully threaded\u003c\/strong\u003e. Length is measured \u003cstrong\u003eoverall (including the head)\u003c\/strong\u003e – this is standard for countersunk screws. \u003cstrong\u003eChoose your preferred overall length\u003c\/strong\u003e (e.g., 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm) — sold as per your requirement. \u003cstrong\u003eHex bits are included\u003c\/strong\u003e with your order – one bit per size or a multi-bit driver, depending on the pack.\u003c\/div\u003e\n\u003c!-- Additional note on countersinking --\u003e\n\u003cdiv class=\"hd-csk-note\" style=\"background: #fef9e6; border-left-color: #e6a017;\"\u003e🔧 \u003cstrong\u003eInstallation tip:\u003c\/strong\u003e For a perfect flush fit, pre-drill a countersunk hole with a 90° countersink bit. The head diameter and angle are standard (90°). These screws are not self-countersinking – proper preparation ensures a professional finish.\u003c\/div\u003e\n\u003c!-- FAQ section (expanded, no accordion) --\u003e\n\u003ch2 class=\"hd-csk-section-title\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/KAY019_6.jpg?v=1776762825\" alt=\"\"\u003e❓ Frequently Asked Questions – Countersunk Allen Socket Screws\u003c\/h2\u003e\n\u003cdiv class=\"hd-csk-faq-item\"\u003e\n\u003cdiv class=\"hd-csk-faq-question\"\u003eHow is the length measured for countersunk screws?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-answer\"\u003e📏 For DIN7991 countersunk socket screws, the length is measured \u003cstrong\u003eoverall\u003c\/strong\u003e – from the top of the head to the tip. This is different from hex head or button head screws (which measure under the head). Always verify your required length based on the overall measurement.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-item\"\u003e\n\u003cdiv class=\"hd-csk-faq-question\"\u003eDo I need to countersink the hole before using these screws?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-answer\"\u003e🔧 Yes. For the head to sit flush with the surface, you must pre-drill a 90° countersink. These screws are not self-countersinking. Proper countersinking ensures a professional finish and prevents material cracking (especially in wood or plastic).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-item\"\u003e\n\u003cdiv class=\"hd-csk-faq-question\"\u003eAre these screws fully threaded? What lengths are available?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-answer\"\u003e✅ Yes, all sizes are fully threaded per DIN7991. Overall lengths from 6mm up to 50mm (common: 6,8,10,12,16,20,25,30,35,40,45,50mm). Custom lengths available for bulk orders – contact us.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-item\"\u003e\n\u003cdiv class=\"hd-csk-faq-question\"\u003eWhat hex key\/bit do I need? Do you include them?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-answer\"\u003e🔩 M3 → 2mm, M4 → 2.5mm, M5 → 3mm, M6 → 4mm, M8 → 5mm. \u003cstrong\u003eYes, the box includes the correct hex screwdriver bits\u003c\/strong\u003e for the screws you order – no need to buy tools separately.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-item\"\u003e\n\u003cdiv class=\"hd-csk-faq-question\"\u003eAre these screws corrosion-resistant for outdoor use?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-faq-answer\"\u003e🌊 Yes – A2-70 stainless steel (304 grade) provides excellent corrosion resistance for outdoor furniture, marine hardware, decking, and coastal environments. They will not rust like carbon steel. For continuous saltwater immersion, consider A4 (316) stainless.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-divider\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"hd-csk-text-small\" style=\"text-align: center; margin-top: 1rem;\"\u003e⚙️ \u003cstrong\u003eHomeDIYer Fastener\u003c\/strong\u003e — Precision stainless steel countersunk screws for flush-mount applications. Order your exact size, length, and quantity today.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 6mm \/ 100","offer_id":52196978426130,"sku":"KAYFST019-1","price":7.5,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8mm \/ 100","offer_id":52196978458898,"sku":"KAYFST019-2","price":7.5,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 100","offer_id":52196978491666,"sku":"KAYFST019-3","price":7.2,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 100","offer_id":52196978524434,"sku":"KAYFST019-4","price":7.2,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 100","offer_id":52196978557202,"sku":"KAYFST019-5","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 20mm \/ 100","offer_id":52196978589970,"sku":"KAYFST019-6","price":8.04,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 25mm \/ 100","offer_id":52196978622738,"sku":"KAYFST019-7","price":8.34,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 30mm \/ 100","offer_id":52196978655506,"sku":"KAYFST019-8","price":8.64,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 35mm \/ 100","offer_id":52196978688274,"sku":"KAYFST019-9","price":9.24,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 40mm \/ 100","offer_id":52196978721042,"sku":"KAYFST019-10","price":9.6,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 100","offer_id":52196978753810,"sku":"KAYFST019-11","price":8.4,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 100","offer_id":52196978786578,"sku":"KAYFST019-12","price":8.7,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20mm \/ 100","offer_id":52196978819346,"sku":"KAYFST019-13","price":9.54,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 25mm \/ 100","offer_id":52196978852114,"sku":"KAYFST019-14","price":10.14,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 100","offer_id":52196978884882,"sku":"KAYFST019-15","price":9.84,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 100","offer_id":52196978917650,"sku":"KAYFST019-16","price":10.44,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 100","offer_id":52196978950418,"sku":"KAYFST019-17","price":12.0,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 100","offer_id":52196978983186,"sku":"KAYFST019-18","price":12.54,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 50","offer_id":52196979015954,"sku":"KAYFST019-19","price":10.5,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 35mm \/ 50","offer_id":52196979048722,"sku":"KAYFST019-20","price":9.9,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 50","offer_id":52196979081490,"sku":"KAYFST019-21","price":36.0,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 50mm \/ 50","offer_id":52196979114258,"sku":"KAYFST019-22","price":11.25,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 100","offer_id":52196979147026,"sku":"KAYFST019-23","price":11.1,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 100","offer_id":52196979179794,"sku":"KAYFST019-24","price":12.24,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 100","offer_id":52196979212562,"sku":"KAYFST019-25","price":12.24,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 100","offer_id":52196979245330,"sku":"KAYFST019-26","price":14.64,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 50","offer_id":52196979278098,"sku":"KAYFST019-27","price":10.5,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 35mm \/ 50","offer_id":52196979310866,"sku":"KAYFST019-28","price":11.64,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 50","offer_id":52196979343634,"sku":"KAYFST019-29","price":12.24,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 50","offer_id":52196979376402,"sku":"KAYFST019-30","price":13.44,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 50","offer_id":52196979409170,"sku":"KAYFST019-31","price":12.09,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 50","offer_id":52196979441938,"sku":"KAYFST019-32","price":11.79,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 50","offer_id":52196979474706,"sku":"KAYFST019-33","price":13.29,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 50","offer_id":52196979507474,"sku":"KAYFST019-34","price":17.08,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 50","offer_id":52196979540242,"sku":"KAYFST019-35","price":18.43,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 35mm \/ 40","offer_id":52196979573010,"sku":"KAYFST019-36","price":14.52,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 45mm \/ 30","offer_id":52196979605778,"sku":"KAYFST019-37","price":14.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/019.jpg?v=1776762903"},{"product_id":"grade-10-9-high-tensile-countersunk-socket-screws-allen-key-flat-head-bolts-m3-to-m8-din7991","title":"Grade 10.9 High Tensile Countersunk Socket Screws – Allen Key Flat Head Bolts M3 to M8 | DIN7991","description":"\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003e \u003cmeta content=\"width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=yes\" name=\"viewport\"\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n \/* ========================\n Prefix: hd-csk10- (prevents theme conflicts)\n Encapsulated styles for Shopify product description\n ======================== *\/\n .hd-csk10-wrapper {\n width: 100%;\n margin: 0;\n padding: 0;\n box-sizing: border-box;\n font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\n color: #1a1a1a;\n line-height: 1.5;\n background: transparent;\n }\n .hd-csk10-wrapper *,\n .hd-csk10-wrapper *::before,\n .hd-csk10-wrapper *::after {\n box-sizing: inherit;\n }\n .hd-csk10-container {\n max-width: 1400px;\n margin: 0 auto;\n padding: 1.5rem 1rem;\n background: #ffffff;\n }\n .hd-csk10-title {\n font-size: 1.9rem;\n font-weight: 600;\n margin: 0 0 0.5rem 0;\n letter-spacing: -0.01em;\n line-height: 1.2;\n color: #0a0a0a;\n }\n .hd-csk10-brand {\n font-size: 1rem;\n color: #2c7da0;\n margin-bottom: 1rem;\n font-weight: 500;\n display: inline-block;\n background: #eef4fc;\n padding: 0.2rem 0.8rem;\n border-radius: 30px;\n }\n .hd-csk10-section-title {\n font-size: 1.6rem;\n font-weight: 600;\n margin: 1.8rem 0 1rem 0;\n 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text-align: left;\n border-bottom: 1px solid #e9ecef;\n }\n .hd-csk10-specs-table th {\n background-color: #f1f9fe;\n font-weight: 700;\n color: #0b3b4f;\n font-size: 0.9rem;\n }\n .hd-csk10-specs-table tr:last-child td {\n border-bottom: none;\n }\n .hd-csk10-note {\n background: #f8fafc;\n padding: 0.8rem 1rem;\n border-radius: 12px;\n font-size: 0.85rem;\n color: #2c5a74;\n margin: 0.8rem 0 1rem;\n border-left: 4px solid #2c7da0;\n }\n .hd-csk10-faq-item {\n margin-bottom: 1.5rem;\n border-bottom: 1px solid #e9ecef;\n padding-bottom: 1.2rem;\n }\n .hd-csk10-faq-question {\n font-weight: 700;\n font-size: 1.05rem;\n margin: 0 0 0.5rem 0;\n color: #0f4c5f;\n display: flex;\n align-items: center;\n gap: 8px;\n }\n .hd-csk10-faq-question::before {\n content: \"⚙️\";\n font-size: 1.1rem;\n }\n .hd-csk10-faq-answer {\n font-size: 0.95rem;\n color: #2d3e50;\n line-height: 1.5;\n margin-left: 1.2rem;\n }\n @media (max-width: 768px) {\n .hd-csk10-container {\n padding: 1rem 0.9rem;\n }\n .hd-csk10-title {\n font-size: 1.6rem;\n }\n .hd-csk10-section-title {\n font-size: 1.4rem;\n }\n .hd-csk10-specs-table th,\n .hd-csk10-specs-table td {\n padding: 0.7rem 0.5rem;\n font-size: 0.8rem;\n }\n }\n .hd-csk10-divider {\n height: 1px;\n background: #e9ecef;\n margin: 1.5rem 0;\n }\n .hd-csk10-text-small {\n font-size: 0.85rem;\n color: #5a6874;\n }\n \u003c\/style\u003e\n\u003cdiv class=\"hd-csk10-wrapper\"\u003e\n\u003cdiv class=\"hd-csk10-container\"\u003e\n\u003c!-- Product title (customer-facing) --\u003e\n\u003ch1 class=\"hd-csk10-title\"\u003e🔩 Grade 10.9 High Tensile Countersunk Socket Screws – Allen Key Flat Head Bolts M3 to M8 | DIN7991\u003c\/h1\u003e\n\u003cdiv class=\"hd-csk10-brand\"\u003e🏷️ Brand: HomeDIYer Fastener | DIN7991 | Grade 10.9 Steel | Black Uncoated | Hex Bits Included\u003c\/div\u003e\n\u003c!-- Product Overview: natural, problem-solving tone --\u003e\n\u003cdiv class=\"hd-csk10-description\"\u003e\n\u003cstrong\u003e📌 Overview — Flush-fit strength for the most demanding assemblies.\u003c\/strong\u003e When you need a completely smooth surface and extreme clamping force, our \u003cstrong\u003eGrade 10.9 High Tensile Countersunk Socket Screws (DIN7991)\u003c\/strong\u003e deliver. With a tensile strength of 1040 MPa (151,000 psi), these fasteners are significantly stronger than standard stainless or Grade 8.8 hardware. The 90° flat head sits flush with or below the workpiece surface, providing a clean, snag-free finish ideal for machinery guards, tooling fixtures, automotive components, and structural applications where protrusions are unacceptable. The hex socket drive (Allen key) allows high torque without cam-out, and we include the correct bits with your order. Fully threaded from M3 to M8, these screws are measured overall (including the head). Choose your exact length and quantity – engineered for professionals who demand both strength and a flush finish.\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-description\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/KAY020_9.jpg?v=1776763230\" alt=\"\"\u003e\u003c\/div\u003e\n\u003c!-- Features: vertical list for SEO \u0026 readability --\u003e\n\u003ch2 class=\"hd-csk10-section-title\"\u003e✨ Key Features – Grade 10.9 Countersunk Socket Screws\u003c\/h2\u003e\n\u003cul class=\"hd-csk10-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade 10.9 High Tensile Alloy Steel\u003c\/strong\u003e – 1040 MPa tensile strength, 900 MPa yield strength – ideal for high-stress, safety-critical applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountersunk 90° Flat Head\u003c\/strong\u003e – Sits flush with or below the surface when installed in a countersunk hole – no snagging, no protruding heads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex Socket Drive (Allen Key)\u003c\/strong\u003e – Enables high torque transfer without cam-out; hex bits included with your order (2mm to 5mm).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIN7991 Standard\u003c\/strong\u003e – Precision metric threads and head geometry for reliable fit in standard countersunk holes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Threaded\u003c\/strong\u003e – Threads run the entire length for maximum grip; length is measured overall (includes head).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric Coarse Threads M3–M8\u003c\/strong\u003e – Standard pitches: M3x0.5, M4x0.7, M5x0.8, M6x1.0, M8x1.25.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack Self-Color (Uncoated) Finish\u003c\/strong\u003e – Natural steel with light oil for storage; suitable for dry or oil-lubricated environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/KAY020_7.jpg?v=1776763229\" alt=\"\"\u003e\u003c\/p\u003e\n\u003c!-- Specifications Table: detailed dimensions --\u003e\n\u003ch2 class=\"hd-csk10-section-title\"\u003e📏 Technical Specifications – Countersunk Socket Screws (DIN7991, Metric Coarse)\u003c\/h2\u003e\n\u003cdiv class=\"hd-csk10-table-wrapper\"\u003e\n\u003ctable class=\"hd-csk10-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n\u003cth\u003eAllen Key Size (mm)\u003c\/th\u003e\n\u003cth\u003eHead Diameter (mm)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-note\"\u003e💡 \u003cstrong\u003eLength \u0026amp; ordering info:\u003c\/strong\u003e Screws are \u003cstrong\u003efully threaded\u003c\/strong\u003e. Length is measured \u003cstrong\u003eoverall (including the head)\u003c\/strong\u003e – this is standard for countersunk screws. \u003cstrong\u003eChoose your preferred overall length\u003c\/strong\u003e (e.g., 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm) — sold as per your requirement. \u003cstrong\u003eHex bits are included\u003c\/strong\u003e with your order – one bit per size or a multi-bit driver, depending on the pack.\u003c\/div\u003e\n\u003c!-- Additional note on material and corrosion --\u003e\n\u003cdiv class=\"hd-csk10-note\" style=\"background: #fef9e6; border-left-color: #e6a017;\"\u003e⚠️ \u003cstrong\u003eMaterial note:\u003c\/strong\u003e Grade 10.9 steel offers exceptional strength but is not corrosion-resistant. The black uncoated finish has light oil to prevent rust during storage. For indoor, dry, or oil-lubricated applications (engines, machinery, tooling), these are ideal. For outdoor or wet environments, use stainless steel or apply a protective coating.\u003c\/div\u003e\n\u003c!-- FAQ section (expanded, no accordion) --\u003e\n\u003ch2 class=\"hd-csk10-section-title\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/KAY020_6.jpg?v=1776763230\" alt=\"\"\u003e❓ Frequently Asked Questions – Grade 10.9 Countersunk Socket Screws\u003c\/h2\u003e\n\u003cdiv class=\"hd-csk10-faq-item\"\u003e\n\u003cdiv class=\"hd-csk10-faq-question\"\u003eHow is the length measured for countersunk screws?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-answer\"\u003e📏 For DIN7991 countersunk socket screws, the length is measured \u003cstrong\u003eoverall\u003c\/strong\u003e – from the top of the head to the tip. This is different from hex head or button head screws (which measure under the head). Always verify your required length based on the overall measurement.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-item\"\u003e\n\u003cdiv class=\"hd-csk10-faq-question\"\u003eDo I need to countersink the hole before using these screws?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-answer\"\u003e🔧 Yes. For the head to sit flush with the surface, you must pre-drill a 90° countersink. These screws are not self-countersinking. Proper countersinking ensures a professional finish and prevents material cracking (especially in metal or plastic).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-item\"\u003e\n\u003cdiv class=\"hd-csk10-faq-question\"\u003eWhat hex key\/bit do I need? Do you include them?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-answer\"\u003e🔩 M3 → 2mm, M4 → 2.5mm, M5 → 3mm, M6 → 4mm, M8 → 5mm. \u003cstrong\u003eYes, the box includes the correct hex screwdriver bits\u003c\/strong\u003e for the screws you order – no need to buy tools separately.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-item\"\u003e\n\u003cdiv class=\"hd-csk10-faq-question\"\u003eHow strong is Grade 10.9 compared to other grades?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-answer\"\u003e📊 Grade 10.9 has a minimum tensile strength of 1040 MPa (151,000 psi) and a yield strength of 900 MPa. For comparison: Grade 8.8 is 800 MPa, A2-70 stainless is 700 MPa. These are excellent for high-stress bolted joints in machinery, automotive, and structural applications.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-item\"\u003e\n\u003cdiv class=\"hd-csk10-faq-question\"\u003eWill these screws rust? Are they suitable for outdoor use?\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-faq-answer\"\u003e🌧️ Grade 10.9 steel is not stainless – it will rust if exposed to moisture. The black uncoated finish has light oil for storage, but for outdoor or wet environments, we recommend applying a rust-preventative coating (paint, zinc spray) or switching to A2\/A4 stainless steel countersunk screws. These are best for dry, indoor, or oil-wetted applications.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-divider\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"hd-csk10-text-small\" style=\"text-align: center; margin-top: 1rem;\"\u003e⚙️ \u003cstrong\u003eHomeDIYer Fastener\u003c\/strong\u003e — High-strength flush-mount fasteners for demanding applications. Order your exact size, length, and quantity today.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 8mm \/ 100","offer_id":52196979638546,"sku":"KAYFST020-1","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 100","offer_id":52196979671314,"sku":"KAYFST020-2","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 12mm \/ 100","offer_id":52196979704082,"sku":"KAYFST020-3","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 16mm \/ 100","offer_id":52196979736850,"sku":"KAYFST020-4","price":7.44,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 20mm \/ 100","offer_id":52196979769618,"sku":"KAYFST020-5","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 8mm \/ 100","offer_id":52196979802386,"sku":"KAYFST020-6","price":6.84,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 10mm \/ 100","offer_id":52196979835154,"sku":"KAYFST020-7","price":6.9,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 100","offer_id":52196979867922,"sku":"KAYFST020-8","price":6.9,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 16mm \/ 100","offer_id":52196979900690,"sku":"KAYFST020-9","price":7.2,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 20mm \/ 100","offer_id":52196979933458,"sku":"KAYFST020-10","price":7.44,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 25mm \/ 100","offer_id":52196979966226,"sku":"KAYFST020-11","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 30mm \/ 100","offer_id":52196979998994,"sku":"KAYFST020-12","price":10.63,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 40mm \/ 100","offer_id":52196980031762,"sku":"KAYFST020-13","price":11.73,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 10mm \/ 100","offer_id":52196980064530,"sku":"KAYFST020-14","price":6.84,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 100","offer_id":52196980097298,"sku":"KAYFST020-15","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 100","offer_id":52196980130066,"sku":"KAYFST020-16","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 100","offer_id":52196980162834,"sku":"KAYFST020-17","price":7.5,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 30mm \/ 100","offer_id":52196980195602,"sku":"KAYFST020-18","price":8.34,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 40mm \/ 80","offer_id":52196980228370,"sku":"KAYFST020-19","price":8.64,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 12mm \/ 100","offer_id":52196980261138,"sku":"KAYFST020-20","price":7.5,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 100","offer_id":52196980293906,"sku":"KAYFST020-21","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 100","offer_id":52196980326674,"sku":"KAYFST020-22","price":8.04,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 50","offer_id":52196980359442,"sku":"KAYFST020-23","price":7.05,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 50","offer_id":52196980392210,"sku":"KAYFST020-24","price":7.35,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 40mm \/ 50","offer_id":52196980424978,"sku":"KAYFST020-25","price":8.34,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 50mm \/ 50","offer_id":52196980457746,"sku":"KAYFST020-26","price":9.24,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 70mm \/ 25","offer_id":52196980490514,"sku":"KAYFST020-27","price":8.62,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 50","offer_id":52196980523282,"sku":"KAYFST020-28","price":8.19,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 40","offer_id":52196980556050,"sku":"KAYFST020-29","price":7.92,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 30","offer_id":52196980588818,"sku":"KAYFST020-30","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 50mm \/ 25","offer_id":52196980621586,"sku":"KAYFST020-31","price":8.64,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 100mm(partial thread) \/ 10","offer_id":52196980654354,"sku":"KAYFST020-32","price":8.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/20_079b306e-9c2b-4821-b0f8-b70ccc41008d.jpg?v=1776763211"},{"product_id":"m2-m12-countersunk-socket-screws-a2-stainless-steel-allen-hex-flat-head-bolts","title":"M2–M12 Countersunk Socket Screws, A2 Stainless Steel Allen Hex Flat Head Machine Bolts","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eA2 Stainless Steel Countersunk Socket Screws — Flush Fit, Clean Finish, Every Time\u003c\/h2\u003e\n\u003cp\u003eWhen a protruding screw head gets in the way — snagging cables, blocking panels, or ruining a clean surface — you need a fastener that disappears into the material. These \u003cstrong\u003eA2 stainless steel countersunk socket screws\u003c\/strong\u003e are built for makers, engineers, and DIYers who demand a flush, professional result without compromise. Whether you're assembling electronics enclosures, CNC-machined parts, or furniture frames, the right flat-head hex bolt makes all the difference.\u003c\/p\u003e\n\u003cp\u003eEach screw features a \u003cstrong\u003e90° countersunk flat head\u003c\/strong\u003e with an Allen hex drive socket, machined from \u003cstrong\u003eA2 (304) stainless steel\u003c\/strong\u003e for reliable corrosion resistance. Sizes span \u003cstrong\u003eM2 through M12\u003c\/strong\u003e, with lengths ranging from 3mm to 100mm depending on diameter — covering the vast majority of metric fastening needs. Available in convenient \u003cstrong\u003e10-piece or 50-piece packs\u003c\/strong\u003e so you can stock exactly what your project requires.\u003c\/p\u003e\n\u003cp\u003eThese \u003cstrong\u003emetric countersunk hex bolts\u003c\/strong\u003e are a go-to choice for 3D printer frames, electronics enclosures, aluminum extrusion builds, cabinetry hardware, and general mechanical assembly. The ISO metric coarse thread ensures compatibility with standard nuts, threaded inserts, and tapped holes across all common M-series designations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e These screws use standard ISO metric coarse thread. Verify your hole diameter, countersink angle (90°), and thread pitch before ordering. Select your size and quantity using the variant options above.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These A2 Stainless Steel Countersunk Socket Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003eAllen Hex Drive Socket\u003c\/strong\u003e — Internal hex socket drive delivers high torque transfer and resists cam-out, making installation fast and reliable even in tight spaces with a standard hex key or Allen wrench.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e90° Flat Countersunk Head\u003c\/strong\u003e — Designed to sit perfectly flush with the surface when installed in a properly countersunk hole, eliminating snag points and creating a clean, finished appearance on panels and frames.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eA2 (304) Stainless Steel Construction\u003c\/strong\u003e — Contains approximately 18% chromium and 8% nickel for solid corrosion resistance in indoor and light outdoor environments, including humid workshops and mild weather exposure.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range: M2 to M12\u003c\/strong\u003e — Covers the most common metric fastener sizes used in electronics, machinery, and structural assembly, with multiple length options per diameter so you can match the exact grip length your application needs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔗\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread\u003c\/strong\u003e — Standard thread pitch on every size ensures direct compatibility with metric nuts, threaded inserts, and tapped holes — no adapters or special tooling required.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e10-Piece or 50-Piece Pack Options\u003c\/strong\u003e — Order a small quantity to complete a single repair, or stock up with a 50-piece pack for ongoing builds and workshop inventory. Both options ship from our US warehouse.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Countersunk Hex Socket Machine Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (equivalent to 304 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCountersunk Flat Head (90° included angle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eHex Socket (Allen \/ Internal Hex)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003eM2, M2.5, M3, M4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Range\u003c\/th\u003e\n\u003ctd\u003e3mm (≈1\/8\") to 100mm (≈3.9\") — varies by diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBright \/ Natural Stainless (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty Class\u003c\/th\u003e\n\u003ctd\u003eTypically Class 70 (≈700 MPa tensile strength)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHex Key Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options (varies by screw diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e10 pieces or 50 pieces (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003ctd\u003eStandard metric nuts, threaded inserts, tapped holes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Use\u003c\/th\u003e\n\u003ctd\u003eElectronics, machinery, furniture, DIY, 3D printers, CNC frames\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eBefore You Order:\u003c\/strong\u003e Confirm your countersink angle is 90°, your hole diameter matches the screw's nominal size, and your thread pitch matches standard ISO metric coarse. If in doubt, contact us to confirm compatibility.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right screw length?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA general rule of thumb is that the screw should engage the base material by at least 2–3 times the screw diameter. For example, an M4 screw typically needs at least 8–12mm of thread engagement in the base material. Remember to account for the countersink depth — the flat head sits below the surface, so the effective clamping length is the total screw length minus the head depth. When in doubt, go slightly longer and trim or select the next size down.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does A2 stainless steel mean, and how does it compare to A4?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel is the ISO designation for 304 stainless steel, containing approximately 18% chromium and 8% nickel. It offers good corrosion resistance for most indoor and light outdoor applications. A4 stainless steel (316 SS) adds molybdenum for enhanced resistance to chlorides and salt — making it the better choice for marine or coastal environments. For typical workshop, home, and electronics use, A2 is generally sufficient.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these screws outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel generally handles light outdoor exposure well — rain, humidity, and mild temperature swings are typically not a problem. However, in environments with heavy salt air, chlorine exposure, or constant moisture (such as coastal or marine settings), A4 (316) stainless steel is usually recommended for longer service life. For most outdoor DIY and garden furniture applications, A2 performs reliably.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat Allen key (hex wrench) size do I need for each screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe required hex key size generally corresponds to the screw diameter as follows (typical values — verify with your specific fastener):\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003eM2 → 1.5mm hex key\u003c\/li\u003e\n\u003cli\u003eM2.5 → 2mm hex key\u003c\/li\u003e\n\u003cli\u003eM3 → 2.5mm hex key\u003c\/li\u003e\n\u003cli\u003eM4 → 3mm hex key\u003c\/li\u003e\n\u003cli\u003eM5 → 4mm hex key\u003c\/li\u003e\n\u003cli\u003eM6 → 5mm hex key\u003c\/li\u003e\n\u003cli\u003eM8 → 6mm hex key\u003c\/li\u003e\n\u003cli\u003eM10 → 8mm hex key\u003c\/li\u003e\n\u003cli\u003eM12 → 10mm hex key\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard metric nuts and threaded inserts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These screws use standard ISO metric coarse thread, which is the most common thread standard for metric fasteners worldwide. They are compatible with standard metric hex nuts, nylon lock nuts, heat-set threaded inserts, and tapped holes of the same M-size designation. Common thread pitches: M3×0.5, M4×0.7, M5×0.8, M6×1.0, M8×1.25, M10×1.5, M12×1.75.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a countersunk screw and a button head or pan head screw?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA \u003cstrong\u003ecountersunk (flat head)\u003c\/strong\u003e screw has a tapered underside that seats into a matching countersunk hole, allowing the head to sit flush with or below the surface. This is ideal when you need a smooth, snag-free surface. A \u003cstrong\u003epan head\u003c\/strong\u003e screw has a low-profile rounded head that sits above the surface — good for clamping thin materials. A \u003cstrong\u003ebutton head\u003c\/strong\u003e has a dome-shaped low-profile head, also sitting above the surface. Choose countersunk when flush mounting is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these screws? Are they suitable for structural use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel socket screws are generally rated to property class 70, with a tensile strength of approximately 700 MPa. They are well-suited for general mechanical assembly, electronics enclosures, furniture, and light machinery. For safety-critical or high-load structural applications, we recommend consulting a qualified engineer and verifying load requirements against the specific fastener's rated capacity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to pre-drill and countersink the hole?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — for a proper flush fit, you need to drill a clearance hole matching the screw's nominal diameter, then use a 90° countersink bit to create the tapered recess for the head. The countersink depth should match the head height of the screw so the top of the head sits level with the surface. In softer materials like wood or plastic, the head may self-countersink slightly, but pre-drilling is always recommended for accuracy and to avoid splitting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2*3mm \/ 10Pcs","offer_id":52254024761618,"sku":"FXLGB04445x10","price":1.8,"currency_code":"USD","in_stock":true},{"title":"M2*4mm \/ 10Pcs","offer_id":52254024794386,"sku":"FXLGB04446x10","price":1.8,"currency_code":"USD","in_stock":true},{"title":"M2*5mm \/ 10Pcs","offer_id":52254024827154,"sku":"FXLGB04447x10","price":1.8,"currency_code":"USD","in_stock":true},{"title":"M2*6mm \/ 10Pcs","offer_id":52254024859922,"sku":"FXLGB04448x10","price":1.86,"currency_code":"USD","in_stock":true},{"title":"M2*7mm \/ 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50Pcs","offer_id":52254032920850,"sku":"FXLGB04343x50","price":2.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of7_0cc0b02a-2d16-44fc-b7dc-3258a9745b95.jpg?v=1779092010"},{"product_id":"m4-aluminum-hex-pan-head-screws","title":"Hex Socket Screws Pan Head Color Aluminum Alloy M4 6-14mm Round Machine Bolts","description":"\u003c!-- Part 1: Product Description HTML for Shopify --\u003e\n\u003cdiv class=\"hdiy-aluminum-hex-screws\"\u003e\n\u003c!-- Product Overview Section --\u003e\n\u003ch2\u003e🔩 Hex Socket Pan Head Screws – M4 Aluminum Alloy 7075, Colored Anodized (6–14mm Lengths)\u003c\/h2\u003e\n\u003cp\u003eYou’re building a lightweight drone, customizing a motorcycle, or assembling a piece of high‑end camera gear – and steel screws are just too heavy. These M4 hex socket pan head screws are machined from 7075 aluminum alloy, then anodized in your choice of color. The result is a fastener that’s strong, corrosion‑resistant, and about one‑third the weight of steel. The hex socket (Allen) drive lets you torque them precisely without slipping, while the pan head provides a wide bearing surface. Available in lengths from 6mm to 14mm (M4 x 0.7 thread). Perfect for aerospace projects, bicycle parts, electronics enclosures, or any build where every gram matters.\u003c\/p\u003e\n\u003c!-- Features Section --\u003e\n\u003ch2\u003e✨ Key Features – M4 Aluminum Hex Socket Pan Head Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-feature-list\"\u003e\n\u003cli\u003e🎨 \u003cstrong\u003eColored anodized finish\u003c\/strong\u003e – Anodizing adds a durable, scratch‑resistant color layer (multiple colors available). Also improves corrosion resistance and gives a professional look.\u003c\/li\u003e\n\u003cli\u003e🔩 \u003cstrong\u003e7075 aluminum alloy\u003c\/strong\u003e – High strength (comparable to mild steel) with excellent fatigue resistance. Commonly used in aerospace and high‑performance applications.\u003c\/li\u003e\n\u003cli\u003e🔧 \u003cstrong\u003eHex socket (Allen) drive\u003c\/strong\u003e – Allows high torque without cam‑out. Clean, recessed drive doesn’t collect dirt.\u003c\/li\u003e\n\u003cli\u003e🔘 \u003cstrong\u003ePan head design\u003c\/strong\u003e – Low profile with wide bearing surface. Distributes clamping force evenly – ideal for thin materials and plastic parts.\u003c\/li\u003e\n\u003cli\u003e⚖️ \u003cstrong\u003eUltra‑lightweight\u003c\/strong\u003e – About 1\/3 the weight of steel screws. Reduces overall assembly mass – critical for drones, racing bikes, and portable equipment.\u003c\/li\u003e\n\u003cli\u003e📏 \u003cstrong\u003eM4 metric thread, lengths 6–14mm\u003c\/strong\u003e – Standard 0.7mm pitch. Fully threaded for maximum grip. Choose from 6, 8, 10, 12, or 14mm.\u003c\/li\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eCorrosion \u0026amp; wear resistant\u003c\/strong\u003e – Anodized surface protects against oxidation and mild chemicals. Good for outdoor and marine (freshwater) use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Specifications Table --\u003e\n\u003ch2\u003e📏 Available Sizes – M4 Colored Aluminum Hex Pan Head Screws\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto;\" class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Diameter (M)\u003c\/th\u003e\n\u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n\u003cth\u003eLength (mm) *\u003c\/th\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003cth\u003eTypical Weight (approx.)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #f5f5f5; text-align: center;\" colspan=\"6\"\u003e📐 Fully threaded – length measured from under the head to tip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e7075 Aluminum\u003c\/td\u003e\n\u003ctd\u003eAnodized (color option)\u003c\/td\u003e\n\u003ctd\u003e~0.2g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e7075 Aluminum\u003c\/td\u003e\n\u003ctd\u003eAnodized\u003c\/td\u003e\n\u003ctd\u003e~0.25g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e7075 Aluminum\u003c\/td\u003e\n\u003ctd\u003eAnodized\u003c\/td\u003e\n\u003ctd\u003e~0.3g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e7075 Aluminum\u003c\/td\u003e\n\u003ctd\u003eAnodized\u003c\/td\u003e\n\u003ctd\u003e~0.35g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e7075 Aluminum\u003c\/td\u003e\n\u003ctd\u003eAnodized\u003c\/td\u003e\n\u003ctd\u003e~0.4g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size: 0.85rem; margin-top: 0.5rem;\" class=\"hdiy-note\"\u003e* Length = threaded portion under the head. Overall length adds approx. 2mm for pan head. Custom lengths available on request.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Technical Specifications Table --\u003e\n\u003ch2\u003e📋 Material \u0026amp; Performance – 7075 Aluminum Alloy\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x: auto;\" class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue \/ Description\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlloy grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7075 (zinc‑based, highest strength of common aluminum alloys)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTensile strength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~570 MPa (comparable to mild steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDensity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.81 g\/cm³ (approx. 1\/3 of steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface treatment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAnodized – colored, hard, corrosion‑resistant layer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCorrosion resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood (anodized layer protects against moisture and mild chemicals)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMagnetic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNon‑magnetic – safe for electronics and sensitive equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTypical applications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAerospace, drones, bicycles, camera rigs, automotive racing, electronics, lightweight structures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- FAQ Section – all expanded --\u003e\n\u003ch2\u003e❓ Frequently Asked Questions – Aluminum Hex Socket Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e1. Are these screws strong enough for structural applications?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003e7075 aluminum has a tensile strength of about 570 MPa, which is similar to mild steel (400‑550 MPa). They are absolutely strong enough for most structural and load‑bearing applications – bike stems, drone frames, camera rigs. However, they are slightly less hard than steel, so avoid over‑torquing. Use a torque wrench for critical assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e2. Will the anodized color scratch or wear off?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eAnodizing is an electrochemical process that creates a hard, bonded oxide layer. It resists scratching much better than paint or plating. However, heavy abrasion or contact with harder materials (steel tools) can leave marks. For normal assembly and use, the color stays intact.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. Can I use these screws outdoors or in saltwater?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eAnodized aluminum has good corrosion resistance in freshwater and mild outdoor environments. For saltwater or coastal areas, untreated aluminum can corrode – but the anodized layer provides protection. For continuous marine use, we recommend clear‑coating or using stainless steel. For most land‑based outdoor projects (bicycles, garden equipment, drones), these are fine.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e4. What hex key size do I need for these M4 screws?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eStandard M4 socket cap screws use a 3mm hex key (Allen wrench). The pan head design typically uses the same size. Always use a good quality hex key that fits snugly to avoid rounding the socket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e5. How do I measure the length of a pan head screw?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eFor pan head screws, length is measured from the underside of the head (the flat bearing surface) to the tip. The head itself is not included. So an “M4 x 10mm” screw has a 10mm threaded shaft under the head. Our lengths follow this standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e6. Do you offer other colors or custom lengths?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"hdiy-faq-answer\"\u003eYes – we can anodize in many colors (red, blue, black, gold, green, etc.) and can produce custom lengths. Contact customer service with your requirements. Minimum order quantities may apply for custom runs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n  .hdiy-aluminum-hex-screws {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-aluminum-hex-screws h2 {\n    font-size: 1.75rem;\n    margin: 1.5rem 0 0.75rem 0;\n    font-weight: 600;\n    border-bottom: 2px solid #eaeaea;\n    padding-bottom: 0.5rem;\n  }\n  .hdiy-aluminum-hex-screws h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-aluminum-hex-screws p {\n    margin-bottom: 1rem;\n    font-size: 1rem;\n  }\n  .hdiy-feature-list {\n    list-style: none;\n    padding-left: 0;\n    margin: 1rem 0;\n  }\n  .hdiy-feature-list li {\n    margin-bottom: 0.75rem;\n    padding-left: 0.25rem;\n    font-size: 1rem;\n    display: flex;\n    align-items: flex-start;\n    gap: 0.5rem;\n  }\n  .hdiy-feature-list li strong {\n    font-weight: 600;\n  }\n  .hdiy-table-wrapper {\n    margin: 1.25rem 0;\n    border: 1px solid #e2e2e2;\n    border-radius: 8px;\n    background: #fff;\n    overflow-x: auto;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.9rem;\n    min-width: 550px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n  }\n  .hdiy-note {\n    font-style: italic;\n    color: #555;\n  }\n  .hdiy-faq {\n    margin: 1.5rem 0;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.5rem;\n    padding-bottom: 0.5rem;\n    border-bottom: 1px solid #ececec;\n  }\n  .hdiy-faq-question {\n    margin-bottom: 0.25rem;\n    font-size: 1.05rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0.25rem;\n    color: #2c2c2c;\n  }\n  @media (max-width: 768px) {\n    .hdiy-aluminum-hex-screws h2 {\n      font-size: 1.5rem;\n    }\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n      font-size: 0.85rem;\n    }\n  }\n\u003c\/style\u003e","brand":"HomeDIYer","offers":[{"title":"M4 x 0.7 x 6mm \/ Wine Red \/ 1","offer_id":52260032151826,"sku":"GLFBJSYGDDTGK04636x1","price":2.16,"currency_code":"USD","in_stock":true},{"title":"M4 x 0.7 x 6mm \/ Wine Red \/ 5","offer_id":52260032184594,"sku":"GLFBJSYGDDTGK04636x5","price":3.93,"currency_code":"USD","in_stock":true},{"title":"M4 x 0.7 x 6mm \/ Wine Red \/ 10","offer_id":52260032217362,"sku":"GLFBJSYGDDTGK04636x10","price":6.11,"currency_code":"USD","in_stock":true},{"title":"M4 x 0.7 x 6mm \/ Wine Red \/ 20","offer_id":52260032250130,"sku":"GLFBJSYGDDTGK04636x20","price":10.73,"currency_code":"USD","in_stock":true},{"title":"M4 x 0.7 x 6mm \/ Rose Red \/ 1","offer_id":52260032282898,"sku":"GLFBJSYGDDTGK04637x1","price":2.16,"currency_code":"USD","in_stock":true},{"title":"M4 x 0.7 x 6mm \/ Rose Red \/ 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and extreme corrosion resistance are non‑negotiable, reach for these 316 stainless steel countersunk hex socket screws. The flat 90° head sits perfectly flush in a countersunk hole – no snagging, no protruding metal. The internal hex drive (Allen key) delivers high torque without slipping, and A4 (316) stainless stands up to saltwater, chemicals, and coastal humidity. Available from M3 up to M12, with lengths from 4mm to 100mm (overall length including head). Choose your pack quantity (1, 3, 5, 10, 20, or 40). Perfect for marine hardware, chemical plants, outdoor machinery, and precision equipment.\u003c\/p\u003e\n\n  \u003c!-- Features --\u003e\n  \u003ch2\u003e✨ Why These 316 Stainless Countersunk Hex Screws\u003c\/h2\u003e\n  \u003cul class=\"hdiy-feature-list\"\u003e\n    \u003cli\u003e🧪 \u003cstrong\u003e316 stainless steel (A4 grade)\u003c\/strong\u003e – Molybdenum‑enhanced for superior pitting and chloride resistance. Ideal for marine, coastal, and chemical environments.\u003c\/li\u003e\n    \u003cli\u003e🔽 \u003cstrong\u003eCountersunk flat head (90°)\u003c\/strong\u003e – Flush fit with any standard countersink. No protruding heads to catch tools or clothing.\u003c\/li\u003e\n    \u003cli\u003e🛠️ \u003cstrong\u003eHex socket drive (Allen)\u003c\/strong\u003e – Internal hex allows high torque transfer with zero cam‑out. Use standard metric hex keys.\u003c\/li\u003e\n    \u003cli\u003e📏 \u003cstrong\u003eFull metric range M3 to M12\u003c\/strong\u003e – Seven diameters cover electronics (M3) to heavy machinery (M12).\u003c\/li\u003e\n    \u003cli\u003e📐 \u003cstrong\u003eLengths from 4mm to 100mm (overall)\u003c\/strong\u003e – Overall length includes the head – simply measure from top to tip.\u003c\/li\u003e\n    \u003cli\u003e📦 \u003cstrong\u003eFlexible pack quantities\u003c\/strong\u003e – 1, 3, 5, 10, 20, or 40 pieces per pack.\u003c\/li\u003e\n    \u003cli\u003e🏭 \u003cstrong\u003eDIN7991 \/ GB standard\u003c\/strong\u003e – Precision metric threads, natural stainless finish.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- Table 1: Size \u0026 Length overview (correct table structure) --\u003e\n  \u003ch2\u003e📏 Available Sizes – M3 to M12 Countersunk Hex Screws (316 Stainless)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eLength Range (overall, mm)\u003c\/th\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e4 – 50\u003c\/td\u003e\n\u003ctd\u003eElectronics, 3D printers, marine instruments\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e5 – 70\u003c\/td\u003e\n\u003ctd\u003eFurniture, boat deck fittings, light machinery\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e6 – 80\u003c\/td\u003e\n\u003ctd\u003eEquipment enclosures, marine hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e6 – 100\u003c\/td\u003e\n\u003ctd\u003eHeavy machinery, boat engines, outdoor fixtures\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e8 – 100\u003c\/td\u003e\n\u003ctd\u003eAutomotive, industrial equipment, deck rails\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e10 – 100\u003c\/td\u003e\n\u003ctd\u003eStructural connections, machinery bases\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e12 – 100\u003c\/td\u003e\n\u003ctd\u003eCrane components, large marine fixtures\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n    \u003cp class=\"hdiy-note\"\u003e📌 Length measured from the top of the head to the tip (overall). Example: M6×30 = M6 thread, 30mm overall length.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Table 2: Full specifications (clean, no rowspan) --\u003e\n  \u003ch2\u003e📋 Full Specifications – DIN7991 Countersunk Hex Socket Screws (316)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e316 stainless steel (A4) with molybdenum\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCountersunk flat head, 90° included angle\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrive style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHex socket (Allen key)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM3, M4, M5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4mm – 100mm (overall, varies by size)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIN7991 \/ GB (metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUntreated, natural stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack quantities\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1, 3, 5, 10, 20, 40 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMarine hardware, chemical plants, outdoor machinery, electronics, automotive\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Stainless comparison note --\u003e\n  \u003cdiv class=\"hdiy-note-box\"\u003e\n    \u003cp\u003e📌 \u003cstrong\u003eStainless steel grade guide:\u003c\/strong\u003e\u003cbr\u003e\n    • 201 stainless – Dry use only, rusts with water.\u003cbr\u003e\n    • 304 stainless (A2) – Good for outdoor\/humid, corrosion resistant.\u003cbr\u003e\n    • \u003cstrong\u003e316 stainless (A4)\u003c\/strong\u003e – Added molybdenum → superior pitting and chloride resistance. Ideal for seawater, chemicals, and salt spray. \u003cstrong\u003eThis product is 316.\u003c\/strong\u003e\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ (expanded) --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions – Countersunk Hex Socket Screws (M3–M12, 316)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e1. What hex key (Allen wrench) size do I need for each screw size?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eM3 = 2mm, M4 = 2.5mm, M5 = 3mm, M6 = 4mm, M8 = 5mm, M10 = 6mm, M12 = 8mm. Always use a good quality metric hex key that fits snugly to avoid rounding the socket.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e2. Why choose 316 (A4) over 304 (A2) stainless?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003e316 contains molybdenum, which dramatically improves resistance to pitting and corrosion from chlorides – saltwater, deicing salts, pool chemicals. If your project will be near the ocean, on a boat, or exposed to harsh chemicals, 316 is the right choice. For general outdoor use, 304 is adequate, but these screws are 316 for maximum durability.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. How do I measure the length correctly?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eFor countersunk screws, length is the overall length – from the top of the head to the tip. Place the screw head‑down on a ruler; measure to the tip. Our lengths (4–100mm) are overall.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e4. Can I use these with nuts or only into tapped holes?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eBoth. They are standard machine screws – use with matching metric nuts (M3–M12) or into pre‑tapped holes. For a flush finish on the nut side, add a countersunk washer or flat washer.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e5. Are these screws fully threaded?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eLengths up to about 60mm are fully threaded. Longer lengths (70–100mm) may have a short unthreaded shank under the head. If you need fully threaded for a specific long size, please contact us.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e6. What pack quantities are available?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYou can order 1, 3, 5, 10, 20, or 40 pieces per pack. Select your desired quantity in the product options.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n  .hdiy-countersunk-hex-screws {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-countersunk-hex-screws h2 {\n    font-size: 1.75rem;\n    margin: 1.5rem 0 0.75rem 0;\n    font-weight: 600;\n    border-bottom: 2px solid #eaeaea;\n    padding-bottom: 0.5rem;\n  }\n  .hdiy-countersunk-hex-screws h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-countersunk-hex-screws p {\n    margin-bottom: 1rem;\n    font-size: 1rem;\n  }\n  .hdiy-feature-list {\n    list-style: none;\n    padding-left: 0;\n    margin: 1rem 0;\n  }\n  .hdiy-feature-list li {\n    margin-bottom: 0.75rem;\n    padding-left: 0.25rem;\n    font-size: 1rem;\n    display: flex;\n    align-items: flex-start;\n    gap: 0.5rem;\n  }\n  .hdiy-table-wrapper {\n    margin: 1.25rem 0;\n    border: 1px solid #e2e2e2;\n    border-radius: 8px;\n    background: #fff;\n    overflow-x: auto;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.9rem;\n    min-width: 450px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n  }\n  .hdiy-note {\n    font-style: italic;\n    color: #555;\n  }\n  .hdiy-note-box {\n    background: #f9f9f9;\n    padding: 0.75rem;\n    border-left: 3px solid #2c7a4d;\n    margin: 1rem 0;\n  }\n  .hdiy-note-box p {\n    margin: 0;\n  }\n  .hdiy-faq {\n    margin: 1.5rem 0;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.5rem;\n    padding-bottom: 0.5rem;\n    border-bottom: 1px solid #ececec;\n  }\n  .hdiy-faq-question {\n    margin-bottom: 0.25rem;\n    font-size: 1.05rem;\n    font-weight: 600;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0.25rem;\n    color: #2c2c2c;\n  }\n  @media (max-width: 768px) {\n    .hdiy-countersunk-hex-screws h2 {\n      font-size: 1.5rem;\n    }\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n      font-size: 0.85rem;\n    }\n  }\n\u003c\/style\u003e","brand":"HomeDIYer","offers":[{"title":"316 Stainless Steel \/ M3*4mm \/ 20","offer_id":52260106273042,"sku":"QTLJGB03716x20","price":3.71,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*4mm \/ 40","offer_id":52260106305810,"sku":"QTLJGB03716x40","price":4.69,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*5mm \/ 20","offer_id":52260106338578,"sku":"QTLJGB03717x20","price":3.71,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*5mm \/ 40","offer_id":52260106371346,"sku":"QTLJGB03717x40","price":4.69,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*6mm \/ 20","offer_id":52260106404114,"sku":"QTLJGB03718x20","price":3.71,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*6mm \/ 40","offer_id":52260106436882,"sku":"QTLJGB03718x40","price":4.69,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*8mm \/ 20","offer_id":52260106469650,"sku":"QTLJGB03719x20","price":3.85,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*8mm \/ 40","offer_id":52260106502418,"sku":"QTLJGB03719x40","price":4.98,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*10mm \/ 20","offer_id":52260106535186,"sku":"QTLJGB03720x20","price":4.01,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*10mm \/ 40","offer_id":52260106567954,"sku":"QTLJGB03720x40","price":5.28,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*12mm \/ 20","offer_id":52260106600722,"sku":"QTLJGB03721x20","price":4.12,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*12mm \/ 40","offer_id":52260106633490,"sku":"QTLJGB03721x40","price":5.51,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*14mm \/ 20","offer_id":52260106666258,"sku":"QTLJGB03722x20","price":4.28,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*14mm \/ 40","offer_id":52260106699026,"sku":"QTLJGB03722x40","price":5.83,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*16mm \/ 20","offer_id":52260106731794,"sku":"QTLJGB03723x20","price":4.42,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*16mm \/ 40","offer_id":52260106764562,"sku":"QTLJGB03723x40","price":6.32,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*18mm \/ 20","offer_id":52260106797330,"sku":"QTLJGB03724x20","price":4.56,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*18mm \/ 40","offer_id":52260106830098,"sku":"QTLJGB03724x40","price":6.79,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*20mm \/ 20","offer_id":52260106862866,"sku":"QTLJGB03725x20","price":4.69,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*20mm \/ 40","offer_id":52260106895634,"sku":"QTLJGB03725x40","price":7.21,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*22mm \/ 20","offer_id":52260106928402,"sku":"QTLJGB03726x20","price":4.83,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*22mm \/ 40","offer_id":52260106961170,"sku":"QTLJGB03726x40","price":7.66,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*25mm \/ 20","offer_id":52260106993938,"sku":"QTLJGB03727x20","price":5.03,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*25mm \/ 40","offer_id":52260107026706,"sku":"QTLJGB03727x40","price":8.47,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*30mm \/ 20","offer_id":52260107059474,"sku":"QTLJGB03728x20","price":5.55,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*30mm \/ 40","offer_id":52260107092242,"sku":"QTLJGB03728x40","price":9.86,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*35mm \/ 20","offer_id":52260107125010,"sku":"QTLJGB03729x20","price":6.2,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*35mm \/ 40","offer_id":52260107157778,"sku":"QTLJGB03729x40","price":11.14,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*40mm \/ 10","offer_id":52260107190546,"sku":"QTLJGB03730x10","price":4.53,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*40mm \/ 20","offer_id":52260107223314,"sku":"QTLJGB03730x20","price":7.43,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*45mm \/ 10","offer_id":52260107256082,"sku":"QTLJGB03731x10","price":4.8,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*45mm \/ 20","offer_id":52260107288850,"sku":"QTLJGB03731x20","price":8.34,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*50mm \/ 10","offer_id":52260107321618,"sku":"QTLJGB03732x10","price":5.15,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M3*50mm \/ 20","offer_id":52260107354386,"sku":"QTLJGB03732x20","price":9.08,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M4*6mm \/ 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3","offer_id":52260113121554,"sku":"QTLJGB17095x3","price":27.32,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M12*100mm \/ 1","offer_id":52260113154322,"sku":"QTLJGB17096x1","price":11.64,"currency_code":"USD","in_stock":true},{"title":"316 Stainless Steel \/ M12*100mm \/ 3","offer_id":52260113187090,"sku":"QTLJGB17096x3","price":32.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of10_9640ae6c-0333-4747-968a-d379852d1022.jpg?v=1778916357"},{"product_id":"hex-socket-flat-round-head-screws-m2-m4-a2-stainless","title":"M2 M3 M4 Flat Round Head Hex Socket Screws – A2 Stainless Steel, Fully Threaded (3–50mm)","description":"\u003cstyle\u003e\n  \/* 统一前缀 hdiy-，避免样式冲突 *\/\n  .hdiy-product-wrap {\n    margin: 0;\n    padding: 0;\n  }\n  .hdiy-product-wrap h2,\n  .hdiy-product-wrap h3 {\n    margin-top: 1.5em;\n    margin-bottom: 0.5em;\n    font-weight: 600;\n  }\n  .hdiy-product-wrap p {\n    margin-bottom: 1em;\n    line-height: 1.5;\n  }\n  .hdiy-features-list {\n    list-style: none;\n    padding-left: 0;\n  }\n  .hdiy-features-list li {\n    margin-bottom: 0.75em;\n    padding-left: 1.5em;\n    position: relative;\n    line-height: 1.4;\n  }\n  .hdiy-features-list li::before {\n    content: \" \";\n    position: absolute;\n    left: 0;\n    top: 0;\n  }\n  .hdiy-table-wrapper {\n    overflow-x: auto;\n    margin: 1.2em 0;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.95rem;\n    background: #fff;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n    width: 35%;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.25rem;\n    border-bottom: 1px solid #eee;\n    padding-bottom: 0.75rem;\n  }\n  .hdiy-faq-question {\n    font-weight: 700;\n    margin-bottom: 0.35rem;\n    font-size: 1rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0;\n    line-height: 1.45;\n    color: #2c2c2c;\n  }\n  @media (max-width: 640px) {\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n\u003c!-- 产品概述 --\u003e\n\u003ch2\u003e🔩 Product Overview: M2–M4 Flat Round Head Hex Socket Screws – A2 Stainless Steel (Grade 4.8)\u003c\/h2\u003e\n\u003cp\u003eNeed a low‑profile fastener with a smooth, snag‑free head and the torque power of a hex drive? These M2, M3, and M4 flat round head hex socket screws (sometimes called button head Allen screws) are made from A2 (304) stainless steel – so they resist rust and corrosion indoors and out. The rounded, low‑profile head sits flush on surfaces, while the internal hex socket lets you apply high torque without stripping or cam‑out. Fully threaded with standard coarse metric pitch, they're perfect for furniture assembly, electronics enclosures, machinery guards, and marine hardware. Lengths from 3mm to 50mm (measured under the head), Grade 4.8 strength – reliable for everyday DIY and professional use.\u003c\/p\u003e\n\u003c!-- 产品特点列表 --\u003e\n\u003ch2\u003e✨ Why These A2 Stainless Hex Socket Screws Are a Workshop Essential\u003c\/h2\u003e\n\u003cul class=\"hdiy-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eA2 (304) stainless steel\u003c\/strong\u003e – Excellent corrosion, oxidation, and heat resistance. High strength and toughness. Ideal for outdoor furniture, kitchen gear, and industrial applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat round (button) head\u003c\/strong\u003e – Low‑profile domed head with a smooth surface. Won't snag on cables or fabric – looks clean on panels and visible assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex socket (Allen) drive\u003c\/strong\u003e – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping. Use a standard metric hex key.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric sizes M2, M3, M4\u003c\/strong\u003e – The most common small diameters for electronics, appliances, furniture, and light machinery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLengths from 3mm to 50mm (under head)\u003c\/strong\u003e – Short screws for thin panels, longer ones for through‑hole applications. Choose exactly what you need.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully threaded, coarse metric pitch\u003c\/strong\u003e – M2x0.4, M3x0.5, M4x0.7. Threads run the entire shank length for maximum grip and easy nut engagement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade 4.8 strength\u003c\/strong\u003e – Reliable for general fastening in furniture, machinery, and structural assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- 规格参数表格（包含M2-M4详细尺寸） --\u003e\n\u003ch2\u003e📏 Technical Specifications – M2–M4 Flat Round Head Hex Socket Screws (A2 Stainless)\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eM2\u003c\/th\u003e\n\u003cth\u003eM3\u003c\/th\u003e\n\u003cth\u003eM4\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Diameter (D)\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003ctd\u003e3mm\u003c\/td\u003e\n\u003ctd\u003e4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Pitch (P)\u003c\/td\u003e\n\u003ctd\u003e0.4mm\u003c\/td\u003e\n\u003ctd\u003e0.5mm\u003c\/td\u003e\n\u003ctd\u003e0.7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Diameter (DK) – approx\u003c\/td\u003e\n\u003ctd\u003e3.8mm\u003c\/td\u003e\n\u003ctd\u003e7.0mm\u003c\/td\u003e\n\u003ctd\u003e8.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Thickness (K) – approx\u003c\/td\u003e\n\u003ctd\u003e1.3mm\u003c\/td\u003e\n\u003ctd\u003e1.8mm\u003c\/td\u003e\n\u003ctd\u003e2.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHex Socket Size (S) – approx\u003c\/td\u003e\n\u003ctd\u003e1.5mm\u003c\/td\u003e\n\u003ctd\u003e2.0mm\u003c\/td\u003e\n\u003ctd\u003e2.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003e304 Stainless Steel (A2 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrade\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003e4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003eFully threaded, coarse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength Range (under head)\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003e3mm – 50mm (select from options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Style\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003eHex key (Allen), metric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- 常见问题 FAQ --\u003e\n\u003ch2\u003e❓ FAQs – M2–M4 Flat Round Head Hex Socket Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws fully threaded? How is length measured?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eYes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the head thickness. For example, an M4 x 12mm screw has 12mm of threaded shank below the head.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What hex key (Allen wrench) size do I need for M2, M3, and M4?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eTypically: M2 uses 1.5mm hex key, M3 uses 2.0mm, M4 uses 2.5mm. A standard metric hex key set (1.5mm, 2mm, 2.5mm) will cover all three sizes.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will 304 stainless steel rust in outdoor or coastal environments?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003e304 stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, 316 stainless (A4) is better, but for garden furniture, railings, and general outdoor DIY, 304 lasts for years without rust.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they self‑tapping?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThese are machine screws – they require a matching metric nut (M2, M3, or M4) or a pre‑tapped hole. They are not self‑tapping. For best corrosion resistance, pair them with 304 stainless nuts.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What lengths are available for M2, M3, and M4?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eWe offer lengths from 3mm up to 50mm. Please select your desired length from the dropdown options on the product page. Typical increments: 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45, 50mm (availability varies by diameter).\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws magnetic?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003e304 stainless is generally non‑magnetic in its annealed state, but cold forming (like thread rolling) can make it slightly magnetic. A light magnetic response is normal and does not affect corrosion resistance or strength.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2*3 \/ 10 Pcs","offer_id":52260522885394,"sku":"GYZXKBRTQJD013640x10","price":1.84,"currency_code":"USD","in_stock":true},{"title":"M2*4 \/ 10 Pcs","offer_id":52260522918162,"sku":"GYZXKBRTQJD013641x10","price":1.84,"currency_code":"USD","in_stock":true},{"title":"M2*5 \/ 10 Pcs","offer_id":52260522950930,"sku":"GYZXKBRTQJD013642x10","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M2*6 \/ 10 Pcs","offer_id":52260522983698,"sku":"GYZXKBRTQJD013643x10","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M2*8 \/ 10 Pcs","offer_id":52260523016466,"sku":"GYZXKBRTQJD013644x10","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M2*10 \/ 10 Pcs","offer_id":52260523049234,"sku":"GYZXKBRTQJD013645x10","price":1.89,"currency_code":"USD","in_stock":true},{"title":"M2*12 \/ 10 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}\n  @media (max-width: 640px) {\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n    }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n\u003c!-- Product Overview --\u003e\n\u003ch2\u003e🔩 Product Overview: M5–M12 Flange Cap Head Hex Socket Screws – 304 Stainless Steel\u003c\/h2\u003e\n\u003cp\u003eWhen you need a fastener that combines a built‑in washer, high torque capability, and excellent corrosion resistance, these flange cap head hex socket bolts are the answer. The integrated flange distributes clamping pressure evenly – no separate washer required. Made from 304 stainless steel (A2 grade), they offer outstanding resistance to rust, oxidation, and heat, plus high strength and toughness. Available in metric sizes M5 to M12, with lengths from 8mm to 60mm (measured under the head). The hex socket (Allen) drive eliminates cam‑out and allows precise torque control. Perfect for machinery, automotive assemblies, furniture, marine hardware, and any application where a secure, vibration‑resistant joint is needed.\u003c\/p\u003e\n\u003c!-- Key Features List --\u003e\n\u003ch2\u003e✨ Why Choose 304 Stainless Steel Flange Hex Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated flange head\u003c\/strong\u003e – Built‑in washer distributes load, protects surfaces, and eliminates the need for a separate flat washer. Saves assembly time and parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e304 stainless steel (A2 grade)\u003c\/strong\u003e – Excellent corrosion, oxidation, and heat resistance. High strength and high toughness for demanding environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex socket (Allen) drive\u003c\/strong\u003e – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetric sizes M5, M6, M8, M10, M12\u003c\/strong\u003e – Covers the most common medium‑to‑large diameters for industrial machinery, automotive, and structural fastening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLengths from 8mm to 60mm (under head)\u003c\/strong\u003e – Short screws for thin panels, longer ones for through‑hole assemblies. Choose exactly what you need.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully threaded, coarse metric pitch\u003c\/strong\u003e – Standard threads: M5x0.8, M6x1.0, M8x1.25, M10x1.5, M12x1.75. Threads run the entire shank length for maximum grip.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide application range\u003c\/strong\u003e – Manufacturing, furniture decoration, automotive, marine, machinery, and general industrial fastening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Specifications Table --\u003e\n\u003ch2\u003e📏 Technical Specifications – Flange Cap Head Hex Screws (M5–M12)\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eFlange Cap Head Hex Socket Machine Screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (A2 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHex key (Allen) – internal hex socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlange cap head (integrated washer flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem of Measurement\u003c\/th\u003e\n\u003ctd\u003eMetric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eScrew Sizes (Diameter)\u003c\/th\u003e\n\u003ctd\u003eM5, M6, M8, M10, M12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitches (coarse)\u003c\/th\u003e\n\u003ctd\u003eM5x0.8, M6x1.0, M8x1.25, M10x1.5, M12x1.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFully threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Range (under head)\u003c\/th\u003e\n\u003ctd\u003e8mm – 60mm (select from options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength Measurement\u003c\/th\u003e\n\u003ctd\u003eUnder head – from flat bearing surface to tip (head not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (unplated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- Frequently Asked Questions --\u003e\n\u003ch2\u003e❓ FAQs – Flange Hex Socket Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What is the advantage of a flange head over a regular socket cap head?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThe integrated flange acts as a built‑in washer. It distributes clamping force over a larger area, protects the surface from damage, and eliminates the need for a separate flat washer. This also helps prevent loosening under vibration. Flange heads are ideal for applications where a washer would be inconvenient or add extra steps.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Are these screws fully threaded? How is length measured?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eYes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the flange head. For example, an M8 x 20mm screw has a 20mm threaded shank.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will 304 stainless steel rust in outdoor or coastal environments?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003e304 stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, A4 (316) stainless is better, but for general outdoor furniture, machinery, and automotive use, 304 lasts for years without rust.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What hex key (Allen wrench) size do I need for M5 through M12?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eStandard hex socket sizes: M5 uses 4mm, M6 uses 5mm, M8 uses 6mm, M10 uses 8mm, M12 uses 10mm (check product head for exact size). A quality metric hex key set will cover these.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they self‑tapping?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThese are standard machine screws – they require a matching metric nut (M5–M12) or a pre‑tapped hole. They are not self‑tapping. For best corrosion resistance, pair them with 304 stainless nuts.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What lengths are available for each diameter?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eWe offer lengths from 8mm to 60mm. Typical ranges: M5: 8–30mm; M6: 10–40mm; M8: 12–50mm; M10: 16–60mm; M12: 20–60mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M5 x 8mm \/ 5 Pcs","offer_id":52284345745682,"sku":"GYZXKBRTQJD014318x5","price":7.19,"currency_code":"USD","in_stock":true},{"title":"M5 x 10mm \/ 5 Pcs","offer_id":52284345778450,"sku":"GYZXKBRTQJD014319x5","price":7.33,"currency_code":"USD","in_stock":true},{"title":"M5 x 12mm \/ 5 Pcs","offer_id":52284345811218,"sku":"GYZXKBRTQJD014320x5","price":7.41,"currency_code":"USD","in_stock":true},{"title":"M5 x 14mm \/ 5 Pcs","offer_id":52284345843986,"sku":"GYZXKBRTQJD014321x5","price":7.41,"currency_code":"USD","in_stock":true},{"title":"M5 x 16mm \/ 5 Pcs","offer_id":52284345876754,"sku":"GYZXKBRTQJD014322x5","price":7.6,"currency_code":"USD","in_stock":true},{"title":"M5 x 18mm \/ 5 Pcs","offer_id":52284345909522,"sku":"GYZXKBRTQJD014323x5","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M5 x 20mm \/ 5 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Pcs","offer_id":52284353052946,"sku":"GYZXKBRTQJD014373x30","price":453.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-05_7f185127-0330-4003-b77e-396e99dfdbda.jpg?v=1779269324"},{"product_id":"countersunk-allen-key-socket-screws-m3-m10-flat-head-grade-12-9","title":"Countersunk Allen Key Socket Screws M3-M10 Flat Head Hex Drive Grade 12.9","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right diameter and length for countersunk Allen key screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the diameter to your tapped hole or nut size (e.g., M5 for an M5 threaded hole). For length, measure the total thickness of the material being fastened and add the countersink depth so the head sits flush. For example, M5 x 16mm (≈5\/8\\u2033) is typically used for joining two 6–7mm panels. Lengths in this listing run from 6mm (≈1\/4\\u2033) to 50mm (≈2\\u2033).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Grade 12.9 mean and how strong are these screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 12.9 is among the highest strength classifications for metric fasteners, indicating a minimum tensile strength of 1220 MPa and a proof load of approximately 1100 MPa. These screws are generally used in high-stress mechanical assemblies, heavy machinery, and structural applications where standard Grade 8.8 fasteners are insufficient.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these countersunk screws suitable for outdoor or corrosive environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 12.9 alloy steel is not inherently corrosion-resistant. For outdoor or humid environments, applying a corrosion-inhibiting coating or using stainless steel alternatives is generally advisable. If outdoor use is required, pairing with anti-seize compound or a zinc-based primer can help extend service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these screws use — are they compatible with standard metric nuts and inserts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These screws use standard ISO metric coarse thread (e.g., M5 x 0.8mm pitch, M8 x 1.25mm pitch). They are compatible with any matching metric nut, threaded insert, or tapped hole following ISO 68-1 thread standards — widely used in automotive, industrial machinery, and fabrication applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What Allen key (hex key) size do I need for each diameter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Hex key sizes typically correspond to the screw diameter: M3 generally uses a 2mm key, M4 uses 2.5mm, M5 uses 3mm, M6 uses 4mm, M8 uses 5mm, and M10 uses 6mm. Always verify with a test fit before applying full torque to avoid rounding the socket.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the countersink angle on these flat head screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Flat head countersunk socket screws in this style typically feature a 90° included angle countersink, which is the standard for ISO metric countersunk screws. This allows the head to sit flush with or below the mating surface when used with a matching countersunk hole.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between a 10-pack and a 100-pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For one-off repairs, prototyping, or testing fit, the 10- or 20-piece packs let you order exactly what you need without over-buying. For production runs, maintenance kits, or workshop stock, the 50- or 100-piece packs offer a lower per-unit cost. Select your quantity from the Quantity(Piece) option above.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCountersunk Allen Key Socket Screws M3–M10 — Flush-Fit Fastening with Grade 12.9 Strength\u003c\/h2\u003e\n    \u003cp\u003eWhen a protruding screw head creates a snag point, clearance problem, or simply looks unfinished, you need a fastener that disappears into the surface. Machinists, fabricators, furniture builders, and serious DIYers who need a clean, flush-mount connection rely on countersunk Allen key socket screws to get the job done right — without sacrificing holding strength.\u003c\/p\u003e\n    \u003cp\u003eEach screw in this listing is a flat-head (90° countersunk) internal hex socket screw rated \u003cstrong\u003eGrade 12.9\u003c\/strong\u003e high tensile alloy steel. Available diameters span \u003cstrong\u003eM3 through M10\u003c\/strong\u003e, with lengths (including head) from \u003cstrong\u003e6mm (≈1\/4\")\u003c\/strong\u003e to \u003cstrong\u003e50mm (≈2\")\u003c\/strong\u003e. Pack quantities of 10, 20, 50, or 100 pieces let you order exactly what your project requires — no more, no less.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include CNC machine bed assembly, automotive bracket mounting, precision fixture building, electronics enclosure assembly, and furniture hardware installation — anywhere you need a \u003cstrong\u003eflat head hex socket screw\u003c\/strong\u003e that sits flush while holding under significant load.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔵\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric coarse thread — M3 through M10. Fits any matching metric nut, threaded insert, or tapped hole per ISO 68-1. Hex key sizes: M3→2mm, M4→2.5mm, M5→3mm, M6→4mm, M8→5mm, M10→6mm.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Grade 12.9 alloy steel is not stainless. Not recommended for outdoor or corrosive environments without a protective coating. Contact us if you need guidance on suitable alternatives.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Countersunk Allen Key Socket Screws M3–M10\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💪\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eGrade 12.9 High Tensile Alloy Steel\u003c\/strong\u003e — Minimum tensile strength of 1220 MPa makes these flat head hex socket screws suitable for high-load mechanical assemblies where standard Grade 8.8 fasteners would fail under stress.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e90° Flat Countersunk Head\u003c\/strong\u003e — The flush-sitting head eliminates snag points and allows smooth movement of adjacent components — ideal for machine slides, panel assemblies, and precision fixtures.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eInternal Hex (Allen Key) Drive\u003c\/strong\u003e — The recessed socket allows torque application in confined spaces where a standard wrench cannot reach, making installation faster and more controlled in tight assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range — M3 to M10, 6mm to 50mm\u003c\/strong\u003e — A single listing covers the most common metric countersunk screw sizes used in automotive, industrial, and DIY applications, reducing the need to source from multiple suppliers.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities — 10 to 100 Pieces\u003c\/strong\u003e — Choose from 10-, 20-, 50-, or 100-piece packs to match your exact project quantity, whether you're doing a one-off repair or stocking a workshop supply.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread Standard\u003c\/strong\u003e — Compatible with off-the-shelf metric nuts, threaded inserts, and tapped holes across automotive, fabrication, and electronics applications — no special tooling required.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Flat Head Countersunk Socket Screws\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eFlat countersunk (90° included angle)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eInternal hex socket (Allen key)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO metric coarse thread\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6, M8, M10\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths (incl. head)\u003c\/th\u003e\n\u003ctd\u003e6mm (≈1\/4\") — 50mm (≈2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHex Key Sizes\u003c\/th\u003e\n\u003ctd\u003eM3→2mm | M4→2.5mm | M5→3mm | M6→4mm | M8→5mm | M10→6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAlloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGrade \/ Strength Class\u003c\/th\u003e\n\u003ctd\u003e12.9 (Tensile strength ≥ 1220 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e10 \/ 20 \/ 50 \/ 100 pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm per diameter (ISO metric coarse standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right diameter and length for countersunk Allen key screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMatch the diameter to your tapped hole or nut size (e.g., M5 for an M5 threaded hole). For length, measure the total thickness of the material being fastened and add the countersink depth so the head sits flush. For example, M5 x 16mm (≈5\/8\") is typically used for joining two 6–7mm panels. Lengths in this listing run from 6mm (≈1\/4\") to 50mm (≈2\") — select the size that gives you at least 1.5× the thread diameter of engagement in the tapped material.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does Grade 12.9 mean and how strong are these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 12.9 is among the highest strength classifications for metric fasteners, indicating a minimum tensile strength of 1220 MPa and a proof load of approximately 1100 MPa. These screws are generally used in high-stress mechanical assemblies, heavy machinery, and structural applications where standard Grade 8.8 fasteners are insufficient.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these countersunk screws suitable for outdoor or corrosive environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 12.9 alloy steel is not inherently corrosion-resistant. For outdoor or humid environments, applying a corrosion-inhibiting coating or using stainless steel alternatives is generally advisable. If outdoor use is required, pairing with anti-seize compound or a zinc-based primer can help extend service life. Contact us if you need guidance on suitable alternatives.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these screws use — are they compatible with standard metric nuts and inserts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese screws use standard ISO metric coarse thread (e.g., M5 × 0.8mm pitch, M8 × 1.25mm pitch). They are compatible with any matching metric nut, threaded insert, or tapped hole following ISO 68-1 thread standards — widely used in automotive, industrial machinery, and fabrication applications worldwide.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat Allen key (hex key) size do I need for each screw diameter?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eHex key sizes typically correspond to the screw diameter: M3 generally uses a \u003cstrong\u003e2mm\u003c\/strong\u003e key, M4 uses \u003cstrong\u003e2.5mm\u003c\/strong\u003e, M5 uses \u003cstrong\u003e3mm\u003c\/strong\u003e, M6 uses \u003cstrong\u003e4mm\u003c\/strong\u003e, M8 uses \u003cstrong\u003e5mm\u003c\/strong\u003e, and M10 uses \u003cstrong\u003e6mm\u003c\/strong\u003e. Always verify with a test fit before applying full torque to avoid rounding the socket drive.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the countersink angle on these flat head screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFlat head countersunk socket screws in this style typically feature a \u003cstrong\u003e90° included angle\u003c\/strong\u003e countersink, which is the standard for ISO metric countersunk screws. This allows the head to sit flush with or below the mating surface when used with a matching countersunk hole — no modification required for standard countersink drill bits.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between a 10-pack and a 100-pack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor one-off repairs, prototyping, or testing fit, the 10- or 20-piece packs let you order exactly what you need without over-buying. For production runs, maintenance kits, or workshop stock, the 50- or 100-piece packs offer a lower per-unit cost. Select your quantity from the \u003cem\u003eQuantity(Piece)\u003c\/em\u003e option above.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003escrew diameter, length, and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 6 \/ 10","offer_id":52284391489810,"sku":"KFCGB11528x10","price":5.13,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 6 \/ 20","offer_id":52284391522578,"sku":"KFCGB11528x20","price":9.15,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 6 \/ 50","offer_id":52284391555346,"sku":"KFCGB11528x50","price":14.1,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 6 \/ 100","offer_id":52284391588114,"sku":"KFCGB11528x100","price":24.71,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 8 \/ 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.hdiy-product-wrap {\n    margin: 0;\n    padding: 0;\n  }\n  .hdiy-product-wrap h2,\n  .hdiy-product-wrap h3 {\n    margin-top: 1.5em;\n    margin-bottom: 0.5em;\n    font-weight: 600;\n  }\n  .hdiy-product-wrap p {\n    margin-bottom: 1em;\n    line-height: 1.5;\n  }\n  .hdiy-features-list {\n    list-style: none;\n    padding-left: 0;\n  }\n  .hdiy-features-list li {\n    margin-bottom: 0.75em;\n    padding-left: 1.5em;\n    position: relative;\n    line-height: 1.4;\n  }\n  .hdiy-features-list li::before {\n    content: \" \";\n    position: absolute;\n    left: 0;\n    top: 0;\n  }\n  .hdiy-table-wrapper {\n    overflow-x: auto;\n    margin: 1.2em 0;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.95rem;\n    background: #fff;\n    min-width: 300px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n    width: 30%;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.25rem;\n    border-bottom: 1px solid #eee;\n    padding-bottom: 0.75rem;\n  }\n  .hdiy-faq-question {\n    font-weight: 700;\n    margin-bottom: 0.35rem;\n    font-size: 1rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0;\n    line-height: 1.45;\n    color: #2c2c2c;\n  }\n  @media (max-width: 640px) {\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n    }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"hdiy-product-wrap\"\u003e\n  \n  \u003c!-- Product Overview --\u003e\n  \u003ch2\u003e🔩 Product Overview: Countersunk Hex Socket Screws – A2 Stainless Steel (M2 to M16)\u003c\/h2\u003e\n  \u003cp\u003eFor a truly flush finish that hides the fastener entirely, countersunk hex socket screws are the professional’s choice. These A2 (304) stainless steel machine screws feature a 90° flat head that sinks perfectly into countersunk holes – leaving a smooth, snag‑free surface. The internal hex drive (Allen key) gives you excellent torque control with zero cam‑out, making them ideal for machinery, furniture, marine hardware, and precision assemblies. Available in metric diameters from M2 up to M16, with lengths to suit your application (total length includes head). Manufactured to DIN 7991 \/ ISO 10642 standards. Corrosion‑resistant, high strength, and ready for demanding environments.\u003c\/p\u003e\n  \n  \u003c!-- Key Features List --\u003e\n  \u003ch2\u003e✨ Why Choose A2 Stainless Countersunk Hex Socket Screws\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features-list\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA2 stainless steel (304 grade)\u003c\/strong\u003e – Excellent corrosion, oxidation, and heat resistance. High strength and superior toughness for long‑term reliability.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCountersunk flat head (90°)\u003c\/strong\u003e – Sits flush with the surface after countersinking. Perfect for panels, decks, and visible assemblies where a clean look is required.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHex socket (Allen) drive\u003c\/strong\u003e – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping the recess.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWide metric range: M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M16\u003c\/strong\u003e – From tiny electronics fasteners up to structural bolts for heavy machinery.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFully threaded (most sizes)\u003c\/strong\u003e – Threads run the entire length for maximum grip in thin materials. Length measured as total screw length including the head.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh precision – DIN 7991 \/ ISO 10642\u003c\/strong\u003e – Consistent head dimensions and thread geometry. See detailed table below for exact specs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWide application range\u003c\/strong\u003e – Machinery, furniture, marine hardware, automotive, electronics, and general fabrication.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003c!-- Detailed Dimensions Table --\u003e\n  \u003ch2\u003e📏 Technical Specifications – Countersunk Hex Socket Screws (DIN 7991 \/ ISO 10642)\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n\u003cth\u003eScrew Size (d)\u003c\/th\u003e\n\u003cth\u003eThread Pitch (p)\u003c\/th\u003e\n\u003cth\u003eHead Thickness (k)\u003c\/th\u003e\n\u003cth\u003eHead Diameter (dk)\u003c\/th\u003e\n\u003cth\u003eHex Socket Size (s)\u003c\/th\u003e\n\u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM2\u003c\/td\u003e\n\u003ctd\u003e0.4\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e1.3\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM2.5\u003c\/td\u003e\n\u003ctd\u003e0.45\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e3.4\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e4.1\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e4.9\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e6.2\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e7.6\u003c\/td\u003e\n\u003ctd\u003e20.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e9.6\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e29.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cp\u003e\u003cem\u003eNote: Dimensions in mm. Length measured as total screw length including head. For M1.6, please see specific product options. All data manually measured – slight variations may occur.\u003c\/em\u003e\u003c\/p\u003e\n  \n  \u003c!-- Frequently Asked Questions --\u003e\n  \u003ch2\u003e❓ FAQs – Countersunk Hex Socket Screws\u003c\/h2\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What is the difference between countersunk and flat head? Are they the same?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eYes – in fasteners, “countersunk” and “flat head” are often used interchangeably. Both refer to a 82° or 90° tapered head designed to sit flush in a countersunk hole. These screws have a 90° included angle (standard for metric countersunk screws).\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 How is length measured for countersunk screws?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eFor countersunk screws, length is measured as total screw length including the head – from the top of the flat head to the tip. For example, an M6 x 20mm screw is 20mm long overall. This matches the standard for DIN 7991\/ISO 10642. Countersunk holes should be drilled to accommodate the full length.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will A2 (304) stainless steel rust outdoors or in marine environments?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eA2 stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, A4 (316) stainless is better. For general outdoor machinery, furniture, and structural applications, 304 lasts for years without rust.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What hex key (Allen wrench) size do I need for each screw diameter?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eRefer to the table: M2–M2.5 use 1.3–1.5mm, M3 uses 2mm, M4 uses 2.5mm, M5 uses 3mm, M6 uses 4mm, M8 uses 5mm, M10 uses 6mm, M12 uses 8mm, M16 uses 10mm. A quality metric hex key set (1.5mm to 10mm) will cover all these sizes.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they for tapped holes only?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eThese are standard machine screws – they work perfectly with matching metric nuts or in pre‑tapped holes. For a flush finish, you would typically use them in countersunk holes without nuts. For through‑hole applications, pair with A2 stainless nuts and washers.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"hdiy-faq-item\"\u003e\n    \u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What lengths are available for each diameter?\u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-answer\"\u003eLengths vary by size – typical ranges: M2–M3: 4–20mm, M4–M5: 6–30mm, M6–M8: 10–50mm, M10–M12: 16–80mm, M16: 25–100mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2 x 3mm \/ 280 Pcs","offer_id":52284416950546,"sku":"GYZXKGY-TCWJTC23150x1","price":22.1,"currency_code":"USD","in_stock":true},{"title":"M2 x 4mm \/ 300 Pcs","offer_id":52284416983314,"sku":"GYZXKGY-TCWJTC23151x1","price":23.79,"currency_code":"USD","in_stock":true},{"title":"M2 x 5mm \/ 340 Pcs","offer_id":52284417016082,"sku":"GYZXKGY-TCWJTC23152x1","price":26.32,"currency_code":"USD","in_stock":true},{"title":"M2 x 6mm \/ 330 Pcs","offer_id":52284417048850,"sku":"GYZXKGY-TCWJTC23153x1","price":26.72,"currency_code":"USD","in_stock":true},{"title":"M2 x 7mm \/ 404 Pcs","offer_id":52284417081618,"sku":"GYZXKGY-TCWJTC23154x1","price":31.27,"currency_code":"USD","in_stock":true},{"title":"M2 x 8mm \/ 310 Pcs","offer_id":52284417114386,"sku":"GYZXKGY-TCWJTC23155x1","price":27.13,"currency_code":"USD","in_stock":true},{"title":"M2 x 9mm \/ 372 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Section --\u003e\n  \u003ch2\u003e🔩 M1.6–M5 Round Pan Head Hex Socket Screws – A2 Stainless Steel, Button Head Design\u003c\/h2\u003e\n  \u003cp\u003eYou’re building a small 3D printer, mounting a delicate electronic panel, or working on a model project – and a tall socket cap head would stick out too much. These M1.6 to M5 round pan head socket screws (also called button head or dome head screws) give you the strength of a hex drive with a low, rounded head that sits close to the surface. Made from A2 stainless steel (304), they resist rust, heat, and corrosion – perfect for indoor and outdoor use. The hex socket (Allen) drive lets you apply torque without slipping, and the smooth, domed top won’t snag. Fully threaded, with length measured under the head. Ideal for tight spaces, marine hardware, electronics enclosures, and precision machinery.\u003c\/p\u003e\n\n  \u003c!-- Features Section --\u003e\n  \u003ch2\u003e✨ Key Features – Round Pan Head Hex Socket Screws (A2 Stainless)\u003c\/h2\u003e\n  \u003cul class=\"hdiy-feature-list\"\u003e\n    \u003cli\u003e🔘 \u003cstrong\u003eLow profile round pan head (button head)\u003c\/strong\u003e – Smooth, domed top with a wide bearing surface. Sits close to the material – no snagging.\u003c\/li\u003e\n    \u003cli\u003e🔧 \u003cstrong\u003eHex socket (Allen) drive\u003c\/strong\u003e – Allows high torque without cam‑out. Clean recess won’t collect dirt.\u003c\/li\u003e\n    \u003cli\u003e🛡️ \u003cstrong\u003eA2 stainless steel (304)\u003c\/strong\u003e – Excellent corrosion resistance, oxidation resistance, and heat resistance. High strength and toughness.\u003c\/li\u003e\n    \u003cli\u003e📏 \u003cstrong\u003eMetric sizes M1.6, M2, M2.5, M3, M4, M5\u003c\/strong\u003e – Perfect for miniature to medium applications in electronics, 3D printers, and marine gear.\u003c\/li\u003e\n    \u003cli\u003e📐 \u003cstrong\u003eFully threaded, lengths measured under head\u003c\/strong\u003e – Example: M4 x 10mm means thread diameter 4mm, length from under head to tip is 10mm. Fully threaded for maximum grip.\u003c\/li\u003e\n    \u003cli\u003e⚙️ \u003cstrong\u003ePrecision engineered\u003c\/strong\u003e – Manufactured to metric standards with accurate head dimensions (see table below).\u003c\/li\u003e\n    \u003cli\u003e🔩 \u003cstrong\u003eVersatile use\u003c\/strong\u003e – 3D printers, electronic enclosures, marine hardware, RC models, furniture, and general DIY.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- Specifications Table --\u003e\n  \u003ch2\u003e📏 Dimensional Specifications – M1.6 to M5 Round Pan Head Hex Socket Screws\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\" style=\"overflow-x: auto;\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eThread Diameter (M)\u003c\/th\u003e\n          \u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n          \u003cth\u003eHead Diameter (dk) – mm\u003c\/th\u003e\n          \u003cth\u003eHead Height (k) – mm\u003c\/th\u003e\n          \u003cth\u003eHex Socket Size (s) – mm\u003c\/th\u003e\n          \u003cth\u003eRecommended Hex Key\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM1.6\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.35\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e2.6\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e1.1\u003c\/td\u003e\n\u003ctd class=\"hex\"\u003e1.3\u003c\/td\u003e\n\u003ctd class=\"tool\"\u003e1.27mm \/ 0.05\"\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM2\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.4\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e3.5\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e1.2\u003c\/td\u003e\n\u003ctd class=\"hex\"\u003e1.3\u003c\/td\u003e\n\u003ctd class=\"tool\"\u003e1.27mm \/ 0.05\"\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM2.5\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.45\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e4.6\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e1.4\u003c\/td\u003e\n\u003ctd class=\"hex\"\u003e1.5\u003c\/td\u003e\n\u003ctd class=\"tool\"\u003e1.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM3\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.5\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e5.5\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e1.5\u003c\/td\u003e\n\u003ctd class=\"hex\"\u003e2.0\u003c\/td\u003e\n\u003ctd class=\"tool\"\u003e2.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM4\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.7\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e7.5\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e2.0\u003c\/td\u003e\n\u003ctd class=\"hex\"\u003e2.5\u003c\/td\u003e\n\u003ctd class=\"tool\"\u003e2.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"dia\"\u003eM5\u003c\/td\u003e\n\u003ctd class=\"pitch\"\u003e0.8\u003c\/td\u003e\n\u003ctd class=\"head-dia\"\u003e9.5\u003c\/td\u003e\n\u003ctd class=\"head-h\"\u003e2.5\u003c\/td\u003e\n\u003ctd class=\"hex\"\u003e3.0\u003c\/td\u003e\n\u003ctd class=\"tool\"\u003e3.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n    \u003cp class=\"hdiy-note\" style=\"font-size:0.85rem; margin-top:0.5rem;\"\u003e📐 Lengths available: typical range from 4mm to 50mm (under head). Select exact length from dropdown. All screws fully threaded. Data based on manual measurement – small variations may occur.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Material Properties Table --\u003e\n  \u003ch2\u003e📋 Why A2 Stainless Steel for Button Head Screws?\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrapper\" style=\"overflow-x: auto;\"\u003e\n    \u003ctable class=\"hdiy-specs-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eBenefit\u003c\/th\u003e\n\u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eCorrosion resistance\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eExcellent – resists rust in outdoor, humid, and coastal environments. No plating needed.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eStrength\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eHigh tensile strength (A2‑70 ~700 MPa). Withstands high torque without deformation.\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eHeat \u0026amp; oxidation resistance\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eSuitable for applications up to moderate temperatures (e.g., engine compartments, industrial equipment).\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr class=\"hdiy-table-row\"\u003e\n\u003ctd class=\"pro\"\u003eMagnetic\u003c\/td\u003e\n\u003ctd class=\"desc\"\u003eAlmost non‑magnetic (slightly magnetic after cold working – normal for 304).\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ Section – all expanded --\u003e\n  \u003ch2\u003e❓ Frequently Asked Questions – Round Pan Head Hex Socket Screws\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e1. How do I measure the length of a round pan head socket screw?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eFor button head (round pan head) screws, length is measured from the underside of the head (the flat bearing surface) to the tip. The head itself is NOT included. So an “M4 x 10mm” screw has a 10mm long threaded shaft under the head. All our lengths follow this standard.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e2. Are these screws fully threaded? What about longer lengths?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYes – all screws in this range (M1.6 to M5, up to 50mm) are fully threaded from under the head to the tip, giving you maximum grip in blind holes or when using nuts.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e3. Can I use these screws outdoors? Will they rust?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eA2 stainless steel (304) is highly corrosion‑resistant and suitable for outdoor use in most environments – rain, humidity, and coastal areas. For continuous saltwater immersion, consider A4 (316) stainless, but for general outdoor and marine‑adjacent applications, A2 is excellent and will not rust.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e4. What hex key size do I need for each screw?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eM1.6 \u0026amp; M2 use 1.27mm (0.05″), M2.5 uses 1.5mm, M3 uses 2.0mm, M4 uses 2.5mm, M5 uses 3.0mm. Always use a quality hex key that fits snugly to avoid rounding the socket.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e5. Can I use these screws with a nut? What size nut fits?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eYes – these are machine screws. Use standard metric nuts of the same thread size (e.g., M3 nut for M3 screw). For outdoor use, pair with stainless steel nuts to avoid galvanic corrosion.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-faq-item\"\u003e\n      \u003cp class=\"hdiy-faq-question\"\u003e\u003cstrong\u003e6. Do you offer other sizes like M6 or M8?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp class=\"hdiy-faq-answer\"\u003eThis listing covers M1.6 to M5. We also carry larger sizes (M6, M8, etc.) in our store – please check our other listings or contact us for custom orders.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n  .hdiy-round-button-screws {\n    max-width: 100%;\n    margin: 0;\n    padding: 0;\n    color: #1a1a1a;\n    line-height: 1.5;\n  }\n  .hdiy-round-button-screws h2 {\n    font-size: 1.75rem;\n    margin: 1.5rem 0 0.75rem 0;\n    font-weight: 600;\n    border-bottom: 2px solid #eaeaea;\n    padding-bottom: 0.5rem;\n  }\n  .hdiy-round-button-screws h2:first-of-type {\n    margin-top: 0;\n  }\n  .hdiy-round-button-screws p {\n    margin-bottom: 1rem;\n    font-size: 1rem;\n  }\n  .hdiy-feature-list {\n    list-style: none;\n    padding-left: 0;\n    margin: 1rem 0;\n  }\n  .hdiy-feature-list li {\n    margin-bottom: 0.75rem;\n    padding-left: 0.25rem;\n    font-size: 1rem;\n    display: flex;\n    align-items: flex-start;\n    gap: 0.5rem;\n  }\n  .hdiy-feature-list li strong {\n    font-weight: 600;\n  }\n  .hdiy-table-wrapper {\n    margin: 1.25rem 0;\n    border: 1px solid #e2e2e2;\n    border-radius: 8px;\n    background: #fff;\n    overflow-x: auto;\n  }\n  .hdiy-specs-table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 0.9rem;\n    min-width: 550px;\n  }\n  .hdiy-specs-table th,\n  .hdiy-specs-table td {\n    border: 1px solid #ddd;\n    padding: 10px 12px;\n    text-align: left;\n    vertical-align: top;\n  }\n  .hdiy-specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n  }\n  .hdiy-note {\n    font-style: italic;\n    color: #555;\n  }\n  .hdiy-faq {\n    margin: 1.5rem 0;\n  }\n  .hdiy-faq-item {\n    margin-bottom: 1.5rem;\n    padding-bottom: 0.5rem;\n    border-bottom: 1px solid #ececec;\n  }\n  .hdiy-faq-question {\n    margin-bottom: 0.25rem;\n    font-size: 1.05rem;\n  }\n  .hdiy-faq-answer {\n    margin-top: 0.25rem;\n    color: #2c2c2c;\n  }\n  @media (max-width: 768px) {\n    .hdiy-round-button-screws h2 {\n      font-size: 1.5rem;\n    }\n    .hdiy-specs-table th,\n    .hdiy-specs-table td {\n      padding: 8px 10px;\n      font-size: 0.85rem;\n    }\n  }\n\u003c\/style\u003e","brand":"HomeDIYer","offers":[{"title":"M1.6 x 3mm \/ 100 Pcs","offer_id":52284425077010,"sku":"GYZXKGY-TCWJTC23756x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 4mm \/ 100 Pcs","offer_id":52284425109778,"sku":"GYZXKGY-TCWJTC23757x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 5mm \/ 100 Pcs","offer_id":52284425142546,"sku":"GYZXKGY-TCWJTC23758x1","price":7.87,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 6mm \/ 100 Pcs","offer_id":52284425175314,"sku":"GYZXKGY-TCWJTC23759x1","price":8.15,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 8mm \/ 100 Pcs","offer_id":52284425208082,"sku":"GYZXKGY-TCWJTC23760x1","price":8.55,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 10mm \/ 100 Pcs","offer_id":52284425240850,"sku":"GYZXKGY-TCWJTC23761x1","price":9.37,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 12mm \/ 100 Pcs","offer_id":52284425273618,"sku":"GYZXKGY-TCWJTC23762x1","price":9.51,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 14mm \/ 100 Pcs","offer_id":52284425306386,"sku":"GYZXKGY-TCWJTC23763x1","price":10.27,"currency_code":"USD","in_stock":true},{"title":"M1.6 x 16mm \/ 100 Pcs","offer_id":52284425339154,"sku":"GYZXKGY-TCWJTC23764x1","price":10.73,"currency_code":"USD","in_stock":true},{"title":"M2 x 3mm \/ 100 Pcs","offer_id":52284425371922,"sku":"GYZXKGY-TCWJTC23765x1","price":8.42,"currency_code":"USD","in_stock":true},{"title":"M2 x 4mm \/ 200 Pcs","offer_id":52284425404690,"sku":"GYZXKGY-TCWJTC23766x1","price":15.08,"currency_code":"USD","in_stock":true},{"title":"M2 x 5mm \/ 200 Pcs","offer_id":52284425437458,"sku":"GYZXKGY-TCWJTC23767x1","price":15.44,"currency_code":"USD","in_stock":true},{"title":"M2 x 6mm \/ 100 Pcs","offer_id":52284425470226,"sku":"GYZXKGY-TCWJTC23768x1","price":9.23,"currency_code":"USD","in_stock":true},{"title":"M2 x 8mm \/ 100 Pcs","offer_id":52284425502994,"sku":"GYZXKGY-TCWJTC23769x1","price":9.78,"currency_code":"USD","in_stock":true},{"title":"M2 x 10mm \/ 100 Pcs","offer_id":52284425535762,"sku":"GYZXKGY-TCWJTC23770x1","price":10.46,"currency_code":"USD","in_stock":true},{"title":"M2 x 12mm \/ 100 Pcs","offer_id":52284425568530,"sku":"GYZXKGY-TCWJTC23771x1","price":11.22,"currency_code":"USD","in_stock":true},{"title":"M2 x 14mm \/ 100 Pcs","offer_id":52284425601298,"sku":"GYZXKGY-TCWJTC23772x1","price":11.9,"currency_code":"USD","in_stock":true},{"title":"M2 x 15mm \/ 100 Pcs","offer_id":52284425634066,"sku":"GYZXKGY-TCWJTC23773x1","price":12.17,"currency_code":"USD","in_stock":true},{"title":"M2 x 16mm \/ 100 Pcs","offer_id":52284425666834,"sku":"GYZXKGY-TCWJTC23774x1","price":12.44,"currency_code":"USD","in_stock":true},{"title":"M2 x 18mm \/ 100 Pcs","offer_id":52284425699602,"sku":"GYZXKGY-TCWJTC23775x1","price":13.26,"currency_code":"USD","in_stock":true},{"title":"M2 x 20mm \/ 50 Pcs","offer_id":52284425732370,"sku":"GYZXKGY-TCWJTC23776x1","price":8.15,"currency_code":"USD","in_stock":true},{"title":"M2 x 22mm \/ 50 Pcs","offer_id":52284425765138,"sku":"GYZXKGY-TCWJTC23777x1","price":9.64,"currency_code":"USD","in_stock":true},{"title":"M2 x 25mm \/ 50 Pcs","offer_id":52284425797906,"sku":"GYZXKGY-TCWJTC23778x1","price":10.13,"currency_code":"USD","in_stock":true},{"title":"M2 x 30mm \/ 50 Pcs","offer_id":52284425830674,"sku":"GYZXKGY-TCWJTC23779x1","price":11.49,"currency_code":"USD","in_stock":true},{"title":"M2 x 35mm \/ 20 Pcs","offer_id":52284425863442,"sku":"GYZXKGY-TCWJTC23780x1","price":7.68,"currency_code":"USD","in_stock":true},{"title":"M2 x 40mm \/ 20 Pcs","offer_id":52284425896210,"sku":"GYZXKGY-TCWJTC23781x1","price":8.01,"currency_code":"USD","in_stock":true},{"title":"M2.5 x 3mm \/ 100 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Makers, RC hobbyists, electronics builders, and DIY fabricators who care about the finished look of their projects need fasteners that disappear into the surface — or stand out intentionally. These M3.5 \/ M4 countersunk hex socket screws in anodized aluminum are designed for exactly that.\u003c\/p\u003e\n\u003cp\u003eEach set contains 5 pieces of the same size and color. Available in M3.5 and M4 thread diameters, with lengths ranging from 6mm (1\/4\") to 30mm (1-3\/16\"), and 10 anodized color options including black, silver, royal blue, sky blue, green, purple, wine red, peach-pink, golden yellow, and brown-orange. The material is aluminum alloy with an anodized surface finish for color durability and light corrosion resistance.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include RC car and drone chassis assembly, electronics enclosure fastening, acrylic and aluminum panel mounting, camera rig builds, and decorative hardware on lightweight frames — anywhere a flush-sitting, colored metric screw adds both utility and visual polish.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric thread standard — M3.5 and M4. Compatible with standard metric nuts, threaded inserts, and tapped holes. \u003cstrong\u003eNot compatible with imperial (UNC\/UNF) threads.\u003c\/strong\u003e Countersunk head requires a matching countersunk hole for flush seating.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eHeads up:\u003c\/strong\u003e Aluminum screws are designed for light-duty applications. For structural, high-torque, or load-bearing assemblies, please confirm suitability or consider steel alternatives.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Anodized Aluminum Countersunk Hex Socket Screws\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e10 Anodized Color Options\u003c\/strong\u003e — Choose from black, silver, royal blue, sky blue, green, purple, wine red, peach-pink, golden yellow, and brown-orange to match or accent your build's color scheme.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eLightweight Aluminum Alloy Construction\u003c\/strong\u003e — Significantly lighter than steel fasteners, making these ideal for weight-sensitive builds like RC models, drones, and portable electronics enclosures.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHex Socket (Allen) Drive\u003c\/strong\u003e — The internal hex socket drive allows for precise torque application in tight spaces, reducing cam-out risk compared to Phillips or slotted heads.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCountersunk Head for Flush Mounting\u003c\/strong\u003e — The flat countersunk head sits flush with or below the surface when used with a properly countersunk hole, delivering a clean, snag-free finish on panels and frames.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAnodized Surface for Corrosion Resistance\u003c\/strong\u003e — The anodized coating adds a durable oxide layer that resists light corrosion and everyday wear, while locking in the color for long-term appearance.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eMultiple Sizes in One Listing\u003c\/strong\u003e — Available in M3.5 (6–16mm) and M4 (6–30mm) lengths, so you can order exactly the size you need for countersunk hex socket screw applications without buying a mixed assortment.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Anodized Aluminum Countersunk Hex Socket Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric (M3.5 \/ M4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eCountersunk (Flat Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eHex Socket (Allen \/ Internal Hex)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAluminum Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eAnodized (color-dyed oxide layer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM3.5, M4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths (M3.5)\u003c\/th\u003e\n\u003ctd\u003e6mm (1\/4\"), 8mm (5\/16\"), 10mm (3\/8\"), 12mm (15\/32\"), 14mm (9\/16\"), 16mm (5\/8\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths (M4)\u003c\/th\u003e\n\u003ctd\u003e6mm (1\/4\"), 8mm (5\/16\"), 10mm (3\/8\"), 12mm (15\/32\"), 14mm (9\/16\"), 16mm (5\/8\"), 18mm (11\/16\"), 20mm (25\/32\"), 25mm (1\"), 30mm (1-3\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor Options\u003c\/th\u003e\n\u003ctd\u003eBlack, Silver, Royal Blue, Sky Blue, Green, Purple, Wine Red, Peach-Pink, Golden Yellow, Brown-Orange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Set\u003c\/th\u003e\n\u003ctd\u003e5 Pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHex Key Size\u003c\/th\u003e\n\u003ctd\u003eSee variant options (typically 2–3mm depending on diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Application\u003c\/th\u003e\n\u003ctd\u003eLight-duty fastening: electronics, RC models, panels, frames\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right length for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA general rule: screw length should be roughly 2–3× the screw diameter for most materials. For M3.5 screws, lengths of 6mm (1\/4\") to 16mm (5\/8\") typically cover thin panels and electronics enclosures. For M4 screws, 6mm (1\/4\") to 30mm (1-3\/16\") covers most DIY and light mechanical applications. Always account for the countersink depth when measuring your required grip length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the load-bearing or clamping strength of these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAnodized aluminum screws are generally suited for light-duty fastening — electronics, RC models, camera rigs, and decorative panels. They are not recommended for structural or high-torque applications where steel fasteners are typically required. Contact us to confirm suitability for your specific load requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these screws suitable for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized coating provides a layer of corrosion resistance, making these screws generally suitable for light outdoor exposure and humid environments. For prolonged submersion or highly corrosive conditions (e.g., saltwater or chemical exposure), stainless steel fasteners are typically recommended instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these screws use — are they compatible with my nuts and inserts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws follow the ISO metric thread standard (M3.5 and M4). They are compatible with standard metric nuts, threaded inserts, and tapped holes of the corresponding size. They are \u003cstrong\u003enot\u003c\/strong\u003e compatible with imperial (UNC\/UNF) threads. If you're unsure, check whether your existing hardware is labeled in millimeters (metric) or inches (imperial).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat hex key (Allen wrench) size do I need to drive these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eM3.5 countersunk hex socket screws typically require a 2mm or 2.5mm hex key. M4 screws generally use a 2.5mm or 3mm hex key. We recommend doing a test fit before final assembly to confirm the correct key size for your specific variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these in aluminum extrusions, acrylic panels, or RC chassis?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — these are commonly used in aluminum extrusions, acrylic and polycarbonate panels, RC car and drone chassis, electronics enclosures, and lightweight structural frames. The countersunk head sits flush with the surface for a clean, professional finish. Ensure the receiving material is pre-drilled and countersunk to the correct angle (typically 90°) for best results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I pick the right color — does color affect performance?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe anodized color is purely aesthetic and does not affect mechanical performance. All color variants use the same aluminum alloy base and anodizing process. Available colors include black, silver, royal blue, sky blue, green, purple, wine red, peach-pink, golden yellow, and brown-orange. Many builders match screw color to their chassis or panel for a polished, coordinated look.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these screws come with a nut or washer?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach set contains 5 screws only — nuts and washers are not included. If you need matching metric nuts or washers, please browse our other listings or contact us for bundle options.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003esize and color\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3.5 x 6mm - Wine red \/ 5 Pcs","offer_id":52284443427090,"sku":"GYZXKHKDG-B1-182x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 6mm - Peach-pink \/ 5 Pcs","offer_id":52284443459858,"sku":"GYZXKHKDG-B1-183x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 6mm - Golden yellow \/ 5 Pcs","offer_id":52284443492626,"sku":"GYZXKHKDG-B1-184x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 6mm - Royal blue \/ 5 Pcs","offer_id":52284443525394,"sku":"GYZXKHKDG-B1-185x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 6mm - 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Purple \/ 5 Pcs","offer_id":52284444016914,"sku":"GYZXKHKDG-B1-200x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 8mm - Brown-orange \/ 5 Pcs","offer_id":52284444049682,"sku":"GYZXKHKDG-B1-201x5","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 10mm - Wine red \/ 5 Pcs","offer_id":52284444082450,"sku":"GYZXKHKDG-B1-202x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 10mm - Peach-pink \/ 5 Pcs","offer_id":52284444115218,"sku":"GYZXKHKDG-B1-203x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 10mm - Golden yellow \/ 5 Pcs","offer_id":52284444147986,"sku":"GYZXKHKDG-B1-204x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 10mm - Royal blue \/ 5 Pcs","offer_id":52284444180754,"sku":"GYZXKHKDG-B1-205x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 10mm - Sky blue \/ 5 Pcs","offer_id":52284444213522,"sku":"GYZXKHKDG-B1-206x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 10mm - 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Golden yellow \/ 5 Pcs","offer_id":52284444475666,"sku":"GYZXKHKDG-B1-214x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - Royal blue \/ 5 Pcs","offer_id":52284444508434,"sku":"GYZXKHKDG-B1-215x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - Sky blue \/ 5 Pcs","offer_id":52284444541202,"sku":"GYZXKHKDG-B1-216x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - Black \/ 5 Pcs","offer_id":52284444573970,"sku":"GYZXKHKDG-B1-217x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - Silver \/ 5 Pcs","offer_id":52284444606738,"sku":"GYZXKHKDG-B1-218x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - Green \/ 5 Pcs","offer_id":52284444639506,"sku":"GYZXKHKDG-B1-219x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - Purple \/ 5 Pcs","offer_id":52284444672274,"sku":"GYZXKHKDG-B1-220x5","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3.5 x 12mm - 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The 90° flat head sinks flush into countersunk holes, leaving a smooth, snag‑free surface. The internal hex (Allen) drive allows you to apply high torque without cam‑out, even in tight spaces. Made from marine‑grade A4 stainless (316), they offer excellent resistance to chlorides, oxidation, and heat, plus high strength and toughness. Available in metric sizes from M2 to M16, with lengths to suit your project. Fully threaded for maximum grip. Ideal for boat hardware, docks, chemical equipment, and any environment where rust is not an option.\u003c\/p\u003e\n\u003c!-- Key Features List --\u003e\n\u003ch2\u003e✨ Why A4 Stainless Steel Countersunk Hex Screws Are the Premium Choice\u003c\/h2\u003e\n\u003cul class=\"hdiy-features-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eA4 stainless steel (316 \/ marine grade)\u003c\/strong\u003e – Contains molybdenum for exceptional resistance to saltwater, chlorides, and industrial chemicals. Outperforms A2 (304) in harsh environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountersunk flat head (90°)\u003c\/strong\u003e – Sits flush with the surface after countersinking. Perfect for marine decks, panels, and visible assemblies where a clean finish is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex socket (Allen) drive\u003c\/strong\u003e – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping the recess.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide metric range: M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M16\u003c\/strong\u003e – From tiny electronics fasteners up to structural bolts for heavy marine and industrial use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully threaded (most sizes)\u003c\/strong\u003e – Threads run the entire length for maximum grip in thin materials. Length measured as total screw length including the head.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh precision – DIN 7991 \/ ISO 10642\u003c\/strong\u003e – Consistent head dimensions and thread geometry. See detailed table below for exact specs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent mechanical properties\u003c\/strong\u003e – High strength, oxidation resistance, heat resistance, and superior toughness for demanding applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- Detailed Dimensions Table --\u003e\n\u003ch2\u003e📏 Technical Specifications – Countersunk Hex Socket Screws (A4 Stainless, DIN 7991)\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\" style=\"width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 12.4535%;\"\u003eScrew Size (d)\u003c\/th\u003e\n\u003cth style=\"width: 13.9405%;\"\u003eThread Pitch (p)\u003c\/th\u003e\n\u003cth style=\"width: 17.658%;\"\u003eHead Thickness (k)\u003c\/th\u003e\n\u003cth style=\"width: 17.1004%;\"\u003eHead Diameter (dk)\u003c\/th\u003e\n\u003cth style=\"width: 13.3829%;\"\u003eHex Socket Size (s)\u003c\/th\u003e\n\u003cth style=\"width: 25.2788%;\"\u003eRecommended Hex Key\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 12.4535%;\"\u003eM2\u003c\/td\u003e\n\u003ctd style=\"width: 13.9405%;\"\u003e0.4\u003c\/td\u003e\n\u003ctd style=\"width: 17.658%;\"\u003e1.9\u003c\/td\u003e\n\u003ctd style=\"width: 17.1004%;\"\u003e4.0\u003c\/td\u003e\n\u003ctd style=\"width: 13.3829%;\"\u003e1.3\u003c\/td\u003e\n\u003ctd style=\"width: 25.2788%;\"\u003e1.27mm \/ 1.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"6\" style=\"width: 99.8141%;\"\u003e\u003cspan\u003eAll dimensions are in millimeters (mm). Length measurements include the head (total length). The above data were obtained through manual measurement and may contain minor errors.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- 修正表格：确保没有合并单元格错乱，重写为规范表格 --\u003e\n\u003cdiv class=\"hdiy-table-wrapper\"\u003e\n\u003ctable class=\"hdiy-specs-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSize (d)\u003c\/th\u003e\n\u003cth\u003ePitch (p)\u003c\/th\u003e\n\u003cth\u003eHead Thick (k)\u003c\/th\u003e\n\u003cth\u003eHead Dia (dk)\u003c\/th\u003e\n\u003cth\u003eHex Size (s)\u003c\/th\u003e\n\u003cth\u003eHex Key\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM2\u003c\/td\u003e\n\u003ctd\u003e0.4\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e1.3\u003c\/td\u003e\n\u003ctd\u003e1.27-1.3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM2.5\u003c\/td\u003e\n\u003ctd\u003e0.45\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e1.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e3.4\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e2.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e4.1\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e3.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e4.9\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e4.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e6.2\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e5.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e7.6\u003c\/td\u003e\n\u003ctd\u003e20.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e6.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e9.6\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e8.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e29.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e10.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cem\u003eNote: Length measured as total screw length including head (e.g., M6 x 20mm = 20mm overall). All dimensions are manually measured – slight variations may occur. Refer to DIN 7991 \/ ISO 10642 for official standards.\u003c\/em\u003e\u003c\/p\u003e\n\u003c!-- Frequently Asked Questions --\u003e\n\u003ch2\u003e❓ FAQs – A4 Stainless Steel Countersunk Hex Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What is the difference between A2 (304) and A4 (316) stainless steel?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eA4 (316) contains molybdenum, which greatly improves resistance to chlorides – that means saltwater, de-icing salts, and many industrial chemicals. A2 (304) is fine for most indoor and general outdoor use, but A4 is the standard for marine, coastal, and chemical environments. It costs a bit more but lasts much longer in harsh conditions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 How is length measured for countersunk screws?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eFor countersunk screws, length is measured as total screw length including the head – from the top of the flat head to the tip. For example, an M6 x 20mm screw is 20mm long overall. This matches DIN 7991 \/ ISO 10642 standards. Countersunk holes should be drilled to accommodate the full length.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Will A4 stainless steel rust in saltwater?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eA4 (316) stainless is highly resistant to saltwater corrosion and is the go‑to choice for boat hardware, dock fittings, and submerged applications. While no metal is completely immune to crevice corrosion in stagnant, low‑oxygen conditions, 316 performs excellently for most marine use. Rinse occasionally with fresh water for maximum lifespan.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What hex key (Allen wrench) size do I need for each screw diameter?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eRefer to the table: M2 uses 1.3mm, M2.5 uses 1.5mm, M3 uses 2mm, M4 uses 2.5mm, M5 uses 3mm, M6 uses 4mm, M8 uses 5mm, M10 uses 6mm, M12 uses 8mm, M16 uses 10mm. A quality metric hex key set (1.5mm to 10mm) will cover all these sizes.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 Can I use these screws with nuts, or are they for tapped holes only?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eThese are standard machine screws – they work perfectly with matching metric nuts or in pre‑tapped holes. For a flush finish, you would typically use them in countersunk holes without nuts. For through‑hole applications, pair with A4 stainless nuts and washers for complete corrosion protection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-item\"\u003e\n\u003cdiv class=\"hdiy-faq-question\"\u003e🔸 What lengths are available for each diameter?\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq-answer\"\u003eLengths vary by size – typical ranges: M2–M3: 4–20mm, M4–M5: 6–30mm, M6–M8: 10–50mm, M10–M12: 16–80mm, M16: 25–100mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2 x 3mm \/ 50 Pcs","offer_id":52284455518482,"sku":"GYZXKGY-TCWJTC27156x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"M2 x 4mm \/ 50 Pcs","offer_id":52284455551250,"sku":"GYZXKGY-TCWJTC27157x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"M2 x 5mm \/ 50 Pcs","offer_id":52284455584018,"sku":"GYZXKGY-TCWJTC27158x1","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M2 x 6mm \/ 50 Pcs","offer_id":52284455616786,"sku":"GYZXKGY-TCWJTC27159x1","price":7.74,"currency_code":"USD","in_stock":true},{"title":"M2 x 8mm \/ 50 Pcs","offer_id":52284455649554,"sku":"GYZXKGY-TCWJTC27160x1","price":7.96,"currency_code":"USD","in_stock":true},{"title":"M2 x 10mm \/ 50 Pcs","offer_id":52284455682322,"sku":"GYZXKGY-TCWJTC27161x1","price":8.09,"currency_code":"USD","in_stock":true},{"title":"M2 x 12mm \/ 50 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Pcs","offer_id":52284460761362,"sku":"GYZXKGY-TCWJTC27316x1","price":26.64,"currency_code":"USD","in_stock":true},{"title":"M16 x 100mm \/ 1 Pcs","offer_id":52284460794130,"sku":"GYZXKGY-TCWJTC27317x1","price":29.17,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-04_0e82a82a-4b15-44de-996a-6dc80d378abb.jpg?v=1779345004"},{"product_id":"m12-countersunk-bolts-allen-key-socket-screws-din7991-grade-12-9","title":"M12 Countersunk Bolts Allen Key Socket Screws DIN7991 High Tensile Grade 12.9","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right length for M12 countersunk socket screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the total thickness of the materials being joined, then subtract the countersink depth so the head sits flush. For example, M12 x 25mm (≈1\\u2033) is typically used for joining two 10–12mm panels. Lengths from 20mm (≈13\/16\\u2033) to 100mm (≈3-15\/16\\u2033) are available in this listing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does Grade 12.9 mean and how strong are these screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 12.9 is among the highest strength classifications for metric fasteners. It indicates a minimum tensile strength of 1220 MPa and a proof load of approximately 1100 MPa. These screws are generally used in high-stress mechanical assemblies, heavy machinery, and structural applications where standard Grade 8.8 or 10.9 bolts are insufficient.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these countersunk screws suitable for outdoor or corrosive environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 12.9 alloy steel screws are not inherently corrosion-resistant. For outdoor or humid environments, we recommend applying a corrosion-inhibiting coating or using stainless steel alternatives. If you need to use these outdoors, pairing them with anti-seize compound or zinc-based primer is generally advisable.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these M12 screws use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These screws conform to DIN 7991 and use standard ISO metric coarse thread (M12 x 1.75mm pitch). They are compatible with any M12 metric nut, threaded insert, or tapped hole following ISO 68-1 thread standards.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What Allen key (hex key) size do I need to drive these screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"M12 DIN 7991 countersunk socket screws typically require a 10mm hex (Allen) key. Always verify with a test fit before applying full torque to avoid rounding the socket.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between fully threaded and partially threaded variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Fully threaded screws (20mm–60mm in this listing) have threads running the entire shank length, providing maximum grip in thinner materials. Partially threaded screws (70mm–100mm) have an unthreaded shank section that acts as a shoulder, improving shear resistance and alignment in thicker assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between buying 2-pack vs. 50-pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For one-off repairs or prototyping, the 1- or 2-piece packs let you test fit without over-buying. For production runs, maintenance kits, or workshop stock, the 10-, 20-, or 50-piece packs offer a lower per-unit cost. Select your pack size from the variant options above.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM12 Countersunk Allen Socket Screws DIN7991 — Flush-Fit Strength for Demanding Assemblies\u003c\/h2\u003e\n    \u003cp\u003eWhen a protruding bolt head is not an option — whether you're building precision machinery, assembling steel frames, or mounting components where clearance is tight — standard hex bolts simply don't cut it. Engineers, fabricators, and serious DIYers who need a flush, low-profile fastening solution rely on M12 countersunk Allen key socket screws to get the job done cleanly and securely.\u003c\/p\u003e\n    \u003cp\u003eEach screw in this listing is an M12 diameter countersunk (flat-head) socket screw manufactured to \u003cstrong\u003eDIN 7991\u003c\/strong\u003e and rated \u003cstrong\u003eGrade 12.9\u003c\/strong\u003e high tensile alloy steel. Available lengths run from \u003cstrong\u003e20mm (≈13\/16\")\u003c\/strong\u003e to \u003cstrong\u003e100mm (≈3-15\/16\")\u003c\/strong\u003e. Shorter lengths (20mm–60mm) are fully threaded; longer lengths (70mm–100mm) are partially threaded for improved shear resistance. Pack quantities range from 1 to 50 pieces so you can order exactly what your project requires.\u003c\/p\u003e\n    \u003cp\u003eTypical applications include CNC machine bed assembly, automotive suspension brackets, steel-to-steel structural connections, and industrial fixture building — anywhere you need a \u003cstrong\u003ehigh tensile countersunk bolt\u003c\/strong\u003e that disappears flush into the surface while holding under extreme load.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔵\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric coarse thread M12 × 1.75mm pitch — fits any M12 nut, threaded insert, or tapped hole per DIN 7991 \/ ISO 68-1. Requires a \u003cstrong\u003e10mm hex (Allen) key\u003c\/strong\u003e for installation.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e Grade 12.9 alloy steel is not stainless. For outdoor or corrosive environments, apply a protective coating or contact us to confirm suitability before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These M12 Countersunk Allen Socket Screws DIN7991\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💪\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eGrade 12.9 High Tensile Strength\u003c\/strong\u003e — Minimum tensile strength of 1220 MPa makes these screws suitable for high-load structural and mechanical assemblies where standard-grade fasteners would fail.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eDIN 7991 Flat Countersunk Head\u003c\/strong\u003e — The 90° countersunk head sits perfectly flush with the mating surface, eliminating snag points and allowing smooth movement of adjacent parts in machinery and fixtures.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eInternal Hex (Allen Key) Drive\u003c\/strong\u003e — The recessed socket drive allows torque application in confined spaces where a standard wrench cannot reach, ideal for tight machine frames and enclosed assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Length Range — Full \u0026amp; Partial Thread\u003c\/strong\u003e — Choose from 20mm to 60mm fully threaded for thinner panels, or 70mm to 100mm partially threaded for thicker structural joints requiring shear-resistant shoulder engagement.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 1, 2, 4, 5, 8, 10, 15, 20, or 50-piece packs so you can match your exact project quantity — from a single prototype fix to a full production run.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO Metric Coarse Thread M12 × 1.75\u003c\/strong\u003e — Standard pitch ensures compatibility with off-the-shelf M12 nuts, threaded inserts, and tapped holes across automotive, industrial, and fabrication applications.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — M12 Countersunk Socket Screws\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 7991\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameter\u003c\/th\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003e1.75mm (ISO Metric Coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e20mm (≈13\/16\") — 100mm (≈3-15\/16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFully threaded: 20–60mm  |  Partially threaded: 70–100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Type\u003c\/th\u003e\n\u003ctd\u003eFlat countersunk (90° included angle)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eInternal hex socket (Allen key)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHex Key Size\u003c\/th\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAlloy steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGrade \/ Strength Class\u003c\/th\u003e\n\u003ctd\u003e12.9 (Tensile strength ≥ 1220 MPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 4 \/ 5 \/ 8 \/ 10 \/ 15 \/ 20 \/ 50 pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Diameter (approx.)\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm exact DIN 7991 M12 head dimensions\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right length for M12 countersunk socket screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the total thickness of the materials being joined, then subtract the countersink depth so the head sits flush. For example, M12 x 25mm (≈1\") is typically used for joining two 10–12mm panels. Lengths from 20mm (≈13\/16\") to 100mm (≈3-15\/16\") are available in this listing — select the size that gives you at least 1.5× the thread diameter of engagement in the tapped material.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does Grade 12.9 mean and how strong are these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 12.9 is among the highest strength classifications for metric fasteners. It indicates a minimum tensile strength of 1220 MPa and a proof load of approximately 1100 MPa. These screws are generally used in high-stress mechanical assemblies, heavy machinery, and structural applications where standard Grade 8.8 or 10.9 bolts are insufficient.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these countersunk screws suitable for outdoor or corrosive environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eGrade 12.9 alloy steel screws are not inherently corrosion-resistant. For outdoor or humid environments, we recommend applying a corrosion-inhibiting coating or using stainless steel alternatives. If you need to use these outdoors, pairing them with anti-seize compound or zinc-based primer is generally advisable. Contact us if you need guidance on coating options.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these M12 screws use — are they compatible with standard nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese screws conform to DIN 7991 and use standard ISO metric coarse thread (M12 × 1.75mm pitch). They are compatible with any M12 metric nut, threaded insert, or tapped hole following ISO 68-1 thread standards — including those used in automotive, industrial machinery, and structural steel fabrication.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat Allen key (hex key) size do I need to drive these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eM12 DIN 7991 countersunk socket screws typically require a \u003cstrong\u003e10mm hex (Allen) key\u003c\/strong\u003e. Always verify with a test fit before applying full torque to avoid rounding the socket. A torque wrench with a hex bit is recommended for critical structural joints.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between fully threaded and partially threaded variants?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFully threaded screws (20mm–60mm in this listing) have threads running the entire shank length, providing maximum grip in thinner materials. Partially threaded screws (70mm–100mm) have an unthreaded shank section that acts as a shoulder, improving shear resistance and alignment accuracy in thicker assemblies — commonly used in precision fixtures and heavy structural joints.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between buying a 2-pack vs. a 50-pack?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor one-off repairs or prototyping, the 1- or 2-piece packs let you test fit without over-buying. For production runs, maintenance kits, or workshop stock, the 10-, 20-, or 50-piece packs offer a lower per-unit cost. Select your pack size from the \u003cem\u003ePack Quantity\u003c\/em\u003e variant option above.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003ethread length and pack quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M12 x 20mm \/ 2","offer_id":52284503687442,"sku":"GLFBQLPBRTQJD009962x2","price":8.47,"currency_code":"USD","in_stock":true},{"title":"M12 x 20mm \/ 5","offer_id":52284503720210,"sku":"GLFBQLPBRTQJD009962x5","price":14.28,"currency_code":"USD","in_stock":true},{"title":"M12 x 20mm \/ 8","offer_id":52284503752978,"sku":"GLFBQLPBRTQJD009962x8","price":21.62,"currency_code":"USD","in_stock":true},{"title":"M12 x 20mm \/ 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20","offer_id":52284506407186,"sku":"GLFBQLPBRTQJD009973x20","price":240.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_7b73402a-3c17-49d5-a085-757b9da3fbe3.jpg?v=1779441893"},{"product_id":"m2-m4-cap-head-socket-screws-half-thread-hex-allen","title":"M2 M2.5 M3 M4 Cap Head Socket Screws Half Thread — Hex Allen Drive Machine Bolts","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right screw length for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A general rule of thumb is to select a length that allows the screw to penetrate the base material by at least 1.5× the thread diameter. For example, an M3 screw typically needs at least 4.5mm of thread engagement. Available lengths in this listing range from 6mm (≈1\/4\\u2033) to 45mm (≈1-3\/4\\u2033).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load-bearing or clamping strength of these screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Tensile and shear strength depend on the base material grade. These cap head socket screws are generally manufactured to a medium-strength grade suitable for general mechanical assembly. For safety-critical or high-load applications, please contact us to confirm the exact grade and confirm suitability.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these screws suitable for outdoor or corrosion-prone environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The nickel-plated finish provides moderate corrosion resistance suitable for indoor and light-duty outdoor use. The black zinc finish offers similar protection with a matte black appearance. For harsh outdoor or marine environments, stainless steel fasteners are generally recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread standard do these screws use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These screws use the ISO metric thread standard (M2, M2.5, M3, M4). They are compatible with standard metric nuts, threaded inserts, and tapped holes following ISO 68-1 specifications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does 'half thread' mean and when should I use it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Half thread (also called partial thread) means only the lower portion of the shank is threaded, while the upper portion is smooth. This design allows the unthreaded shank to act as a shoulder, providing better alignment and clamping force between two parts — ideal for applications where you need to pull two components tightly together.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What hex key (Allen wrench) size do I need to drive these screws?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The required hex key size follows standard ISO socket head cap screw specifications: M2 typically uses a 1.5mm hex key, M2.5 uses 2mm, M3 uses 2.5mm, and M4 uses 3mm. Always verify with a test fit before final assembly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these screws in aluminum, plastic, or wood?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These cap head socket screws are commonly used in aluminum enclosures, plastic housings, and light woodworking jigs. For plastic or soft materials, pre-drilling a pilot hole and using a threaded insert is generally recommended to prevent stripping.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003ch2\u003eCap Head Socket Screws with Half Thread — Reliable Metric Fasteners for Precision Assembly\u003c\/h2\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003cp\u003eWhen a loose fit or stripped thread ruins a project, the fastener is usually the culprit. Makers, engineers, and repair technicians who work with electronics enclosures, aluminum frames, and mechanical assemblies need cap head socket screws they can trust to seat flush, clamp tight, and stay put — without rounding out under torque.\u003c\/p\u003e\n    \u003cp\u003eEach set contains 20, 50, or 100 pieces of cap head hex socket screws with a half-thread (partial thread) shank. Available in M2, M2.5, M3, and M4 thread diameters with lengths ranging from 6mm (≈1\/4\") to 45mm (≈1-3\/4\"). Choose between a nickel-plated finish for a clean silver look or a black zinc finish for a matte, low-profile appearance.\u003c\/p\u003e\n    \u003cp\u003eThese metric socket head cap screws are widely used in 3D printer frame assembly, RC car chassis builds, electronics enclosure mounting, and DIY CNC machine construction — anywhere a hex Allen drive and a clean cylindrical head profile are required.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔵\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility:\u003c\/strong\u003e ISO metric thread standard (M2 \/ M2.5 \/ M3 \/ M4). Fits standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. Driven with a standard hex Allen key (1.5mm \/ 2mm \/ 2.5mm \/ 3mm respectively).\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Cap Head Hex Socket Screws\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHalf-Thread Shank Design\u003c\/strong\u003e — The unthreaded shoulder section improves part alignment and maximizes clamping force between two mating components, a critical advantage in precision mechanical assembly.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eCylindrical Cap Head Profile\u003c\/strong\u003e — The tall, cylindrical head provides a larger bearing surface than a flat-head screw, distributing load evenly and reducing the risk of pull-through in softer materials like aluminum or plastic.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔑\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHex Allen Socket Drive\u003c\/strong\u003e — The internal hex socket allows high torque application in tight spaces where a standard screwdriver cannot reach, making these ideal for recessed mounting holes in 3D printer frames and CNC builds.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eTwo Finish Options\u003c\/strong\u003e — Nickel-plated for a bright, corrosion-resistant appearance in visible assemblies; black zinc for a matte, low-reflectance look in electronics and tactical equipment builds.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Covers M2 through M4 in lengths from 6mm to 45mm, letting you stock a single listing to cover most small-to-medium metric fastener needs across multiple projects.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 20, 50, or 100-piece packs so hobbyists can grab a small quantity for a one-off repair while workshop users can stock up at a lower per-piece cost.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Cap Head Socket Machine Screws\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric (M2 \/ M2.5 \/ M3 \/ M4)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eHalf thread (partial thread \/ shoulder shank)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eCap head (cylindrical \/ socket head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eHex Allen socket (internal hex)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHex Key Size\u003c\/th\u003e\n\u003ctd\u003eM2 → 1.5mm | M2.5 → 2mm | M3 → 2.5mm | M4 → 3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003eM2, M2.5, M3, M4\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e6mm (≈1\/4\") to 45mm (≈1-3\/4\") — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003ctd\u003eNickel plated or Black zinc — select above\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e20 pcs \/ 50 pcs \/ 100 pcs — select above\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSee variant options \/ Contact us to confirm grade\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitch\u003c\/th\u003e\n\u003ctd\u003eM2 → 0.4mm | M2.5 → 0.45mm | M3 → 0.5mm | M4 → 0.7mm (standard coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eNote:\u003c\/strong\u003e If you need to confirm exact material grade, tensile strength, or RoHS compliance for your application, please contact us before ordering.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right screw length for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eA general rule of thumb is to select a length that allows the screw to penetrate the base material by at least 1.5× the thread diameter. For example, an M3 screw typically needs at least 4.5mm of thread engagement. Available lengths in this listing range from 6mm (≈1\/4\") to 45mm (≈1-3\/4\"). Measure your stack-up thickness first, then subtract the unthreaded shank length to confirm adequate thread engagement.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the load-bearing or clamping strength of these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eTensile and shear strength depend on the base material grade. These cap head socket screws are generally manufactured to a medium-strength grade suitable for general mechanical assembly. For safety-critical or high-load applications, please contact us to confirm the exact grade and verify suitability before ordering.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these screws suitable for outdoor or corrosion-prone environments?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe nickel-plated finish provides moderate corrosion resistance suitable for indoor and light-duty outdoor use. The black zinc finish offers similar protection with a matte black appearance. For harsh outdoor, high-humidity, or marine environments, stainless steel fasteners are generally recommended instead.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread standard do these screws use — are they compatible with standard metric hardware?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese screws use the ISO metric coarse thread standard (M2, M2.5, M3, M4). They are compatible with standard metric nuts, threaded inserts, and tapped holes following ISO 68-1 specifications. They are \u003cem\u003enot\u003c\/em\u003e compatible with UNC\/UNF inch-standard hardware.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does \"half thread\" mean and when should I use it instead of a fully threaded screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eHalf thread (also called partial thread) means only the lower portion of the shank is threaded, while the upper portion is smooth. This design allows the unthreaded shank to act as a shoulder, providing better alignment and stronger clamping force between two parts. It is ideal for applications where you need to pull two components tightly together — such as joining an aluminum plate to a frame — rather than threading into a single piece of material.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat hex key (Allen wrench) size do I need to drive these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThe required hex key size follows standard ISO socket head cap screw specifications: M2 typically uses a \u003cstrong\u003e1.5mm\u003c\/strong\u003e hex key, M2.5 uses \u003cstrong\u003e2mm\u003c\/strong\u003e, M3 uses \u003cstrong\u003e2.5mm\u003c\/strong\u003e, and M4 uses \u003cstrong\u003e3mm\u003c\/strong\u003e. Always do a test fit before final assembly to confirm the correct key size.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these screws in aluminum, plastic, or wood?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eYes. These cap head socket screws are commonly used in aluminum enclosures, plastic housings, and light woodworking jigs. For plastic or soft materials, pre-drilling a pilot hole and using a threaded insert is generally recommended to prevent stripping. In aluminum, tapping the hole to the correct metric pitch before installation will give the best results.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your \u003cstrong\u003esize, length, finish, and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M2*30mm \/ 20pcs \/ Nickel plated","offer_id":52284748726546,"sku":"ZXCGB03544x20","price":3.82,"currency_code":"USD","in_stock":true},{"title":"M3*12mm \/ 20pcs \/ Nickel plated","offer_id":52284748759314,"sku":"ZXCGB03545x20","price":3.13,"currency_code":"USD","in_stock":true},{"title":"M3*14mm \/ 20pcs \/ Nickel plated","offer_id":52284748792082,"sku":"ZXCGB03546x20","price":3.28,"currency_code":"USD","in_stock":true},{"title":"M3*16mm \/ 20pcs \/ Nickel 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Black zinc","offer_id":52284749054226,"sku":"ZXCGB03554x20","price":3.07,"currency_code":"USD","in_stock":true},{"title":"M2*15mm \/ 20pcs \/ Black zinc","offer_id":52284749086994,"sku":"ZXCGB03555x20","price":3.13,"currency_code":"USD","in_stock":true},{"title":"M2*22mm \/ 20pcs \/ Black zinc","offer_id":52284749119762,"sku":"ZXCGB03556x20","price":3.52,"currency_code":"USD","in_stock":true},{"title":"M2*25mm \/ 20pcs \/ Black zinc","offer_id":52284749152530,"sku":"ZXCGB03557x20","price":3.58,"currency_code":"USD","in_stock":true},{"title":"M2*28mm \/ 20pcs \/ Black zinc","offer_id":52284749185298,"sku":"ZXCGB03558x20","price":3.97,"currency_code":"USD","in_stock":true},{"title":"M2*30mm \/ 20pcs \/ Black zinc","offer_id":52284749218066,"sku":"ZXCGB03559x20","price":4.12,"currency_code":"USD","in_stock":true},{"title":"M2.5*22mm \/ 20pcs \/ Black zinc","offer_id":52284749250834,"sku":"ZXCGB03560x20","price":3.73,"currency_code":"USD","in_stock":true},{"title":"M2.5*25mm \/ 20pcs \/ Black zinc","offer_id":52284749283602,"sku":"ZXCGB03561x20","price":3.97,"currency_code":"USD","in_stock":true},{"title":"M2.5*28mm \/ 20pcs \/ Black zinc","offer_id":52284749316370,"sku":"ZXCGB03562x20","price":4.12,"currency_code":"USD","in_stock":true},{"title":"M2.5*30mm \/ 20pcs \/ Black zinc","offer_id":52284749349138,"sku":"ZXCGB03563x20","price":4.18,"currency_code":"USD","in_stock":true},{"title":"M2.5*35mm \/ 20pcs \/ Black zinc","offer_id":52284749381906,"sku":"ZXCGB03564x20","price":4.32,"currency_code":"USD","in_stock":true},{"title":"M2.5*40mm \/ 20pcs \/ Black zinc","offer_id":52284749414674,"sku":"ZXCGB03565x20","price":5.32,"currency_code":"USD","in_stock":true},{"title":"M2.5*45mm \/ 20pcs \/ Black zinc","offer_id":52284749447442,"sku":"ZXCGB03566x20","price":5.92,"currency_code":"USD","in_stock":true},{"title":"M3*12mm \/ 20pcs \/ Black zinc","offer_id":52284749480210,"sku":"ZXCGB03567x20","price":3.13,"currency_code":"USD","in_stock":true},{"title":"M3*14mm \/ 20pcs \/ Black zinc","offer_id":52284749512978,"sku":"ZXCGB03568x20","price":3.28,"currency_code":"USD","in_stock":true},{"title":"M3*16mm \/ 20pcs \/ Black zinc","offer_id":52284749545746,"sku":"ZXCGB03569x20","price":3.37,"currency_code":"USD","in_stock":true},{"title":"M3*20mm \/ 20pcs \/ Black zinc","offer_id":52284749578514,"sku":"ZXCGB03570x20","price":3.73,"currency_code":"USD","in_stock":true},{"title":"M4*15mm \/ 20pcs \/ Black zinc","offer_id":52284749611282,"sku":"ZXCGB03571x20","price":3.88,"currency_code":"USD","in_stock":true},{"title":"M4*20mm \/ 20pcs \/ Black zinc","offer_id":52284749644050,"sku":"ZXCGB03572x20","price":4.27,"currency_code":"USD","in_stock":true},{"title":"M4*25mm \/ 20pcs \/ Black zinc","offer_id":52284749676818,"sku":"ZXCGB03573x20","price":4.57,"currency_code":"USD","in_stock":true},{"title":"M2*30mm \/ 50pcs \/ Nickel plated","offer_id":52284749709586,"sku":"ZXCGB03544x50","price":6.96,"currency_code":"USD","in_stock":true},{"title":"M3*12mm \/ 50pcs \/ Nickel plated","offer_id":52284749742354,"sku":"ZXCGB03545x50","price":5.62,"currency_code":"USD","in_stock":true},{"title":"M3*14mm \/ 50pcs \/ Nickel plated","offer_id":52284749775122,"sku":"ZXCGB03546x50","price":6.36,"currency_code":"USD","in_stock":true},{"title":"M3*16mm \/ 50pcs \/ Nickel plated","offer_id":52284749807890,"sku":"ZXCGB03547x50","price":7.11,"currency_code":"USD","in_stock":true},{"title":"M4*15mm \/ 50pcs \/ Nickel plated","offer_id":52284749840658,"sku":"ZXCGB03548x50","price":8.76,"currency_code":"USD","in_stock":true},{"title":"M4*20mm \/ 50pcs \/ Nickel plated","offer_id":52284749873426,"sku":"ZXCGB03549x50","price":9.51,"currency_code":"USD","in_stock":true},{"title":"M4*25mm \/ 50pcs \/ Nickel plated","offer_id":52284749906194,"sku":"ZXCGB03550x50","price":10.31,"currency_code":"USD","in_stock":true},{"title":"M2*6mm \/ 50pcs \/ Black zinc","offer_id":52284749938962,"sku":"ZXCGB03551x50","price":4.72,"currency_code":"USD","in_stock":true},{"title":"M2*8mm \/ 50pcs \/ Black zinc","offer_id":52284749971730,"sku":"ZXCGB03552x50","price":4.87,"currency_code":"USD","in_stock":true},{"title":"M2*10mm \/ 50pcs \/ Black zinc","offer_id":52284750004498,"sku":"ZXCGB03553x50","price":5.02,"currency_code":"USD","in_stock":true},{"title":"M2*12mm \/ 50pcs \/ Black zinc","offer_id":52284750037266,"sku":"ZXCGB03554x50","price":5.17,"currency_code":"USD","in_stock":true},{"title":"M2*15mm \/ 50pcs \/ Black zinc","offer_id":52284750070034,"sku":"ZXCGB03555x50","price":5.32,"currency_code":"USD","in_stock":true},{"title":"M2*22mm \/ 50pcs \/ Black zinc","offer_id":52284750102802,"sku":"ZXCGB03556x50","price":6.22,"currency_code":"USD","in_stock":true},{"title":"M2*25mm \/ 50pcs \/ Black zinc","offer_id":52284750135570,"sku":"ZXCGB03557x50","price":6.51,"currency_code":"USD","in_stock":true},{"title":"M2*28mm \/ 50pcs \/ Black zinc","offer_id":52284750168338,"sku":"ZXCGB03558x50","price":7.41,"currency_code":"USD","in_stock":true},{"title":"M2*30mm \/ 50pcs \/ Black zinc","offer_id":52284750201106,"sku":"ZXCGB03559x50","price":7.71,"currency_code":"USD","in_stock":true},{"title":"M2.5*22mm \/ 50pcs \/ Black zinc","offer_id":52284750233874,"sku":"ZXCGB03560x50","price":7.11,"currency_code":"USD","in_stock":true},{"title":"M2.5*25mm \/ 50pcs \/ Black zinc","offer_id":52284750266642,"sku":"ZXCGB03561x50","price":7.86,"currency_code":"USD","in_stock":true},{"title":"M2.5*28mm \/ 50pcs \/ Black zinc","offer_id":52284750299410,"sku":"ZXCGB03562x50","price":8.06,"currency_code":"USD","in_stock":true},{"title":"M2.5*30mm \/ 50pcs \/ Black zinc","offer_id":52284750332178,"sku":"ZXCGB03563x50","price":8.46,"currency_code":"USD","in_stock":true},{"title":"M2.5*35mm \/ 50pcs \/ Black zinc","offer_id":52284750364946,"sku":"ZXCGB03564x50","price":8.91,"currency_code":"USD","in_stock":true},{"title":"M2.5*40mm \/ 50pcs \/ Black 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