{"product_id":"a2-stainless-steel-countersunk-socket-screws-allen-key-flat-head-bolts-m3-to-m8-din7991","title":"A2 Stainless Steel 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-csk- (prevents theme conflicts)\n 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 \/ 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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 \/ 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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","url":"https:\/\/homediyer.com\/products\/a2-stainless-steel-countersunk-socket-screws-allen-key-flat-head-bolts-m3-to-m8-din7991","provider":"HomeDIYer","version":"1.0","type":"link"}