{"product_id":"hex-socket-countersunk-machine-screws-m2-m5","title":"Hex Socket Flat Head Machine Screws M2–M5 — Allen Drive Countersunk, Multiple Finishes, 100 or 200 Pack","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003c!-- ① OVERVIEW --\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHex Socket Countersunk Machine Screws M2–M5 — Flush-Mount Allen Drive for Clean, Precise Assemblies\u003c\/h2\u003e\n\u003cp\u003eWhen a protruding screw head is not an option — whether you're assembling an electronics enclosure, mounting a camera plate, building precision jigs, or finishing furniture hardware — you need a countersunk screw that sits perfectly flush. Hex socket countersunk machine screws give makers, engineers, and DIYers the torque control of an Allen drive with the clean, recessed profile of a flat head. Finding the right size, finish, and quantity in one place is the challenge this listing solves.\u003c\/p\u003e\n\u003cp\u003eEach pack contains either \u003cstrong\u003e100 or 200 pieces\u003c\/strong\u003e of the same material, size, and length combination. Screws are available in \u003cstrong\u003eM2, M2.5, M3, M4, and M5\u003c\/strong\u003e metric coarse thread, with lengths ranging from \u003cstrong\u003e4.5mm (≈3\/16\")\u003c\/strong\u003e to \u003cstrong\u003e25mm (≈1\")\u003c\/strong\u003e depending on the size selected. Material options span seven finishes: Carbon Steel \/ Bright Nickel, Carbon Steel \/ Black Nickel, Carbon Steel \/ Black Zinc, Carbon Steel \/ Zinc Nickel Alloy Black, Carbon Steel \/ Zinc Alloy Black With Glue (nylon patch locking), Stainless Steel, and Stainless Steel \/ Electrophoresis Black. Select your combination from the variant options above.\u003c\/p\u003e\n\u003cp\u003eTypical applications include securing PCB standoffs and electronics panel covers where a flush surface is required, assembling aluminum extrusion frames and CNC-machined parts with \u003cem\u003eM3 hex socket flat head screws\u003c\/em\u003e, mounting optics and camera accessories that demand vibration resistance (especially the nylon-patch locking variant), and installing furniture cam-lock hardware or decorative panel fasteners where screw heads must not protrude. Long-tail searches like \u003cem\u003eblack countersunk Allen screws M4 bulk pack\u003c\/em\u003e and \u003cem\u003estainless steel flat head hex socket screws M5\u003c\/em\u003e describe exactly what this listing covers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- ② COMPATIBILITY BAR --\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e ISO metric coarse thread — M2, M2.5, M3, M4, M5. Compatible with standard metric nuts, threaded inserts, and tapped holes. \u003cstrong\u003eNot compatible with UNC\/UNF inch-standard threads.\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c!-- ③ KEY FEATURES --\u003e\n\u003ch2\u003e✅ Key Features of These Hex Socket Countersunk Machine 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\u003eAllen Drive Hex Socket\u003c\/strong\u003e — The internal hex recess allows higher torque transfer than Phillips or slotted drives, reducing cam-out risk during installation in tight spaces or with power drivers.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eCountersunk Flat Head Profile\u003c\/strong\u003e — The 90° countersunk head sits flush with or below the surface when installed in a properly chamfered hole, eliminating snag points on electronics panels, jigs, and furniture faces.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eSeven Finish Options\u003c\/strong\u003e — From bright nickel to matte electrophoresis black, the finish range covers both functional corrosion protection and aesthetic matching for anodized aluminum, powder-coated steel, and dark enclosures.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔒\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eNylon Patch Locking Variant\u003c\/strong\u003e — The \"Zinc Alloy Black With Glue\" option features a factory-applied thread-locking patch that resists loosening from vibration without liquid thread locker — ideal for motor mounts, camera rigs, and mechanical assemblies.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🦠\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eStainless Steel Option for Corrosion Resistance\u003c\/strong\u003e — Plain and electrophoresis black stainless steel variants provide reliable performance in humid, outdoor, or mildly corrosive environments where carbon steel finishes may degrade over time.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003e100 or 200 Piece Packs\u003c\/strong\u003e — Bulk quantity options reduce per-unit cost for workshop stock, production runs, and maintenance kits. Each pack contains a single consistent size, length, and finish combination.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- ④ TECHNICAL SPECIFICATIONS --\u003e\n\u003ch2\u003e📐 Technical Specifications — Hex Socket Countersunk Machine Screws\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\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\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\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse (DIN 7991 \/ ISO 10642)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes\u003c\/th\u003e\n\u003ctd\u003eM2, M2.5, M3, M4, M5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e4.5mm (≈3\/16\") to 25mm (≈1\") — varies by size; see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel (various finishes); Stainless Steel (plain \u0026amp; electrophoresis black)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish Options\u003c\/th\u003e\n\u003ctd\u003eBright Nickel, Black Nickel, Black Zinc, Zinc Nickel Alloy Black, Zinc Alloy Black With Glue (nylon patch), Electrophoresis Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLocking Feature\u003c\/th\u003e\n\u003ctd\u003eNylon thread-locking patch (\"With Glue\" variant only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e100 pcs or 200 pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically Class 8.8–10.9 (carbon steel); A2-70 (stainless) — contact us to confirm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHex Key Size Required\u003c\/th\u003e\n\u003ctd\u003e1.5mm–4mm depending on screw size — see FAQ below\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\u003c!-- ⑤ FAQ --\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 for a countersunk application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor countersunk screws, the listed length includes the entire screw from the top of the head to the tip. Measure the total thickness of the material being fastened, then add the depth of thread engagement needed in the base material — typically at least 1.5× the screw diameter. For example:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003eM3 screw (3mm diameter) → generally needs at least 4.5mm thread engagement in the base\u003c\/li\u003e\n\u003cli\u003eM4 screw (4mm diameter) → generally needs at least 6mm thread engagement in the base\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAvailable lengths in this listing range from \u003cstrong\u003e4.5mm (≈3\/16\")\u003c\/strong\u003e to \u003cstrong\u003e25mm (≈1\")\u003c\/strong\u003e depending on the size. When in doubt, choose the next length up.\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 for each screw size?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eHex socket sizes typically correspond to screw diameter as follows:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eM2\u003c\/strong\u003e — typically 1.5mm hex key\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM2.5\u003c\/strong\u003e — typically 1.5mm or 2mm hex key\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM3\u003c\/strong\u003e — typically 2mm or 2.5mm hex key\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM4\u003c\/strong\u003e — typically 3mm hex key\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM5\u003c\/strong\u003e — typically 4mm hex key\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways do a test fit before applying torque to avoid stripping the socket recess.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the tensile strength of these screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eCarbon steel variants are generally equivalent to ISO property class 8.8 or 10.9 depending on the specific finish and heat treatment. Stainless steel variants are typically A2-70 grade. For safety-critical, structural, or load-bearing applications, please contact us to confirm the exact grade before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these screws be used outdoors or in corrosive environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eIt depends on the finish selected:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel (plain or electrophoresis black)\u003c\/strong\u003e — suitable for outdoor, humid, and mildly corrosive environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon Steel \/ Black Nickel, Black Zinc, Zinc Nickel Alloy Black\u003c\/strong\u003e — moderate corrosion resistance; suitable for indoor and sheltered outdoor use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon Steel \/ Bright Nickel\u003c\/strong\u003e — primarily decorative; best for dry indoor applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor marine or highly corrosive environments, stainless steel is generally the recommended choice.\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 metric nuts and inserts?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese screws use \u003cstrong\u003eISO metric coarse thread\u003c\/strong\u003e (M2, M2.5, M3, M4, M5). They are compatible with standard metric hex nuts, nylon lock nuts, threaded inserts, and tapped holes of the matching size and pitch. They are \u003cem\u003enot\u003c\/em\u003e compatible with UNC or UNF inch-standard threads. Always verify the thread designation matches your application before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the \"Zinc Alloy Black With Glue\" finish — does it lock in place?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe \"With Glue\" designation refers to a \u003cstrong\u003efactory-applied nylon thread-locking patch\u003c\/strong\u003e on the screw threads. This creates a prevailing torque that resists loosening from vibration without requiring a separate lock washer or liquid thread locker. Key points:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003eEffective for motor mounts, camera rigs, and mechanical assemblies subject to vibration\u003c\/li\u003e\n\u003cli\u003eThis is a \u003cstrong\u003esingle-use\u003c\/strong\u003e locking feature — once removed, the patch loses most of its locking effectiveness\u003c\/li\u003e\n\u003cli\u003eNot recommended for applications requiring frequent disassembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich finish should I choose for electronics enclosures or a clean aesthetic look?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a sleek, dark appearance in electronics enclosures, camera rigs, or furniture hardware:\u003c\/p\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarbon Steel \/ Black Nickel\u003c\/strong\u003e — uniform dark finish, good for anodized aluminum and powder-coated surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless Steel \/ Electrophoresis Black\u003c\/strong\u003e — dark finish with added corrosion resistance; popular for outdoor camera mounts and precision instruments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor a bright silver finish, \u003cstrong\u003eCarbon Steel \/ Bright Nickel\u003c\/strong\u003e or plain \u003cstrong\u003eStainless Steel\u003c\/strong\u003e are typically preferred. The Zinc Nickel Alloy Black finish offers a slightly deeper black tone with enhanced corrosion resistance compared to standard black nickel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c!-- ⑥ CTA BAR --\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ematerial, size, and quantity\u003c\/strong\u003e above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Carbon Steel \/ Bright Nickel \/ M2 x 5 mm \/ 100 PCS","offer_id":52285318234386,"sku":"GYJLTJLWJ04163x1","price":5.97,"currency_code":"USD","in_stock":true},{"title":"Stainless Steel \/ M2.5 x 6 mm \/ 100 PCS","offer_id":52285318267154,"sku":"GYJLTJLWJ04164x1","price":7.41,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M2.5 x 10 mm \/ 100 PCS","offer_id":52285318299922,"sku":"GYJLTJLWJ04165x1","price":8.81,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Nickel \/ M2.5 x 10 mm \/ 100 PCS","offer_id":52285318332690,"sku":"GYJLTJLWJ04166x1","price":8.31,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 4.5 mm \/ 100 PCS","offer_id":52285318365458,"sku":"GYJLTJLWJ04167x1","price":9.26,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Zinc Nickel Alloy Black \/ M3 x 5 mm \/ 100 PCS","offer_id":52285318398226,"sku":"GYJLTJLWJ04168x1","price":11.8,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Zinc Alloy Black With Glue \/ M3 x 22 mm \/ 100 PCS","offer_id":52285318430994,"sku":"GYJLTJLWJ04169x1","price":18.18,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Nickel \/ M4 x 16 mm \/ 100 PCS","offer_id":52285318463762,"sku":"GYJLTJLWJ04170x1","price":21.98,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Nickel \/ M4 x 24 mm \/ 100 PCS","offer_id":52285318496530,"sku":"GYJLTJLWJ04171x1","price":27.46,"currency_code":"USD","in_stock":true},{"title":"Stainless Steel \/ Electrophoresis Black \/ M5 x 10 mm \/ 100 PCS","offer_id":52285318529298,"sku":"GYJLTJLWJ04172x1","price":33.35,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M5 x 25 mm \/ 100 PCS","offer_id":52285318562066,"sku":"GYJLTJLWJ04173x1","price":40.68,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M2 x 5 mm \/ 200 PCS","offer_id":52285318594834,"sku":"GYJLTJLWJ04163x2","price":11.15,"currency_code":"USD","in_stock":true},{"title":"Stainless Steel \/ M2.5 x 6 mm \/ 200 PCS","offer_id":52285318627602,"sku":"GYJLTJLWJ04164x2","price":13.4,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Bright Nickel \/ M2.5 x 10 mm \/ 200 PCS","offer_id":52285318660370,"sku":"GYJLTJLWJ04165x2","price":16.24,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Nickel \/ M2.5 x 10 mm \/ 200 PCS","offer_id":52285318693138,"sku":"GYJLTJLWJ04166x2","price":15.1,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M3 x 4.5 mm \/ 200 PCS","offer_id":52285318725906,"sku":"GYJLTJLWJ04167x2","price":17.19,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Zinc Nickel Alloy Black \/ M3 x 5 mm \/ 200 PCS","offer_id":52285318758674,"sku":"GYJLTJLWJ04168x2","price":22.22,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Zinc Alloy Black With Glue \/ M3 x 22 mm \/ 200 PCS","offer_id":52285318791442,"sku":"GYJLTJLWJ04169x2","price":34.94,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Nickel \/ M4 x 16 mm \/ 200 PCS","offer_id":52285318824210,"sku":"GYJLTJLWJ04170x2","price":42.47,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Nickel \/ M4 x 24 mm \/ 200 PCS","offer_id":52285318856978,"sku":"GYJLTJLWJ04171x2","price":53.49,"currency_code":"USD","in_stock":true},{"title":"Stainless Steel \/ Electrophoresis Black \/ M5 x 10 mm \/ 200 PCS","offer_id":52285318889746,"sku":"GYJLTJLWJ04172x2","price":65.31,"currency_code":"USD","in_stock":true},{"title":"Carbon Steel \/ Black Zinc \/ M5 x 25 mm \/ 200 PCS","offer_id":52285318922514,"sku":"GYJLTJLWJ04173x2","price":79.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of13_147844e2-7b98-4e32-95a7-6e5ae2cf131e.jpg?v=1780503168","url":"https:\/\/homediyer.com\/products\/hex-socket-countersunk-machine-screws-m2-m5","provider":"HomeDIYer","version":"1.0","type":"link"}