{"product_id":"m3-socket-head-cap-screws-nut-kit-282pcs-12-9-grade-black","title":"M3 Socket Head Cap Screws \u0026 Nut Kit 282Pcs, 12.9 Grade Black, DIN 912, 10 Lengths","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eM3 Socket Head Cap Screws \u0026amp; Nut Kit — 282-Piece 12.9 Grade Black Alloy Steel Assortment\u003c\/h2\u003e\n    \u003cp\u003eWhen your 3D printer, RC build, or precision assembly demands fasteners that won't strip, cam out, or corrode, standard hardware-store screws fall short. This 282-piece M3 socket head cap screw and nut kit is engineered for builders who need reliable, high-tensile fasteners across a wide range of lengths in a single organized set.\u003c\/p\u003e\n    \u003cp\u003eThe kit includes M3 socket head cap screws in 10 lengths — 3 mm through 20 mm (approximately 1\/8\" to 3\/4\") — plus matching M3 hex nuts, all manufactured from 12.9 grade carbon steel with a black oxide finish. Each size is individually bagged and stored in a compartment case for quick access and zero mix-ups.\u003c\/p\u003e\n    \u003cp\u003eIdeal for 3D printer frame assembly, electronics enclosure mounting, bicycle component repair, communication equipment, and general home workshop use where metric M3 fasteners and a DIN 912 hex socket drive 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    Compatible with M3 threaded holes; driven by M2.5 hex key (Allen wrench); conforms to DIN 912 standard; suitable for carbon steel, aluminum, and plastic assemblies\n  \u003c\/div\u003e\n\n  \u003cdiv\u003e\n    \u003ch2\u003e✅ Key Features of These M3 Socket Head Cap 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\u003e12.9 Grade High-Tensile Strength:\u003c\/strong\u003e Carbon steel at 12.9 grade delivers exceptional clamping force and resistance to shear — ideal for applications where standard 8.8 or 10.9 fasteners are insufficient.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eBlack Oxide Corrosion Resistance:\u003c\/strong\u003e The black finish provides moderate corrosion and wear resistance while maintaining a clean, professional appearance in exposed assemblies.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003e10 Lengths in One Kit:\u003c\/strong\u003e Covers M3 × 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 18 mm, and 20 mm — eliminating the need to order multiple packs for a single project.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eDeep, Precise Hex Socket Drive:\u003c\/strong\u003e DIN 912 cup head profile with a clean M2.5 hex socket ensures positive engagement, reducing cam-out and driver slip during installation or removal.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e♻️\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eReusable Fasteners:\u003c\/strong\u003e High-grade steel construction allows repeated installation and removal without thread deformation, making these suitable for assemblies that require periodic disassembly.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🗂️\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eOrganized Compartment Storage Case:\u003c\/strong\u003e Each size is individually bagged inside a labeled compartment case — no loose screws, no guessing, and easy transport to the workbench or job site.\u003c\/span\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📦 What's in the Box\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eItem\u003c\/th\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 3 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 4 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 5 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 6 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 8 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 10 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 12 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 16 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 18 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Socket Head Cap Screw\u003c\/td\u003e\n\u003ctd\u003eM3 × 20 mm\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Hex Nut\u003c\/td\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003eSee variant label\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003eTotal Pieces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e282 Pcs\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd colspan=\"2\"\u003eStorage\u003c\/td\u003e\n\u003ctd\u003e1× Compartment case with individual size bags\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\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\u003e3D Printer Builders \u0026amp; Modders\u003c\/strong\u003e\n      \u003cp\u003eM3 is the dominant fastener size in FDM printer frames (Voron, Prusa, Ender series). Having all lengths on hand eliminates mid-build delays when a specific screw length is missing.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🔧\u003c\/span\u003e\n      \u003cstrong\u003eElectronics \u0026amp; Enclosure Assembly\u003c\/strong\u003e\n      \u003cp\u003eMounting PCBs, securing enclosure panels, and assembling rack hardware all rely on M3 socket head cap screws. The black oxide finish suits both functional and aesthetic enclosure builds.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🚲\u003c\/span\u003e\n      \u003cstrong\u003eBicycle \u0026amp; RC Vehicle Maintenance\u003c\/strong\u003e\n      \u003cp\u003eComponent adjustments, accessory mounts, and drivetrain hardware on bicycles and RC vehicles frequently call for M3 metric fasteners — this kit covers the full range of common lengths.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🏠\u003c\/span\u003e\n      \u003cstrong\u003eHome Workshop \u0026amp; DIY Projects\u003c\/strong\u003e\n      \u003cp\u003eFrom furniture assembly to appliance repair, a well-stocked M3 assortment reduces trips to the hardware store and keeps projects moving without interruption.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003e12.9\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eSocket Head Cap (Cup Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eHex Socket (Allen)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHex Key Size\u003c\/th\u003e\n\u003ctd\u003eM2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eDIN 912\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e3, 4, 5, 6, 8, 10, 12, 16, 18, 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNut Thread\u003c\/th\u003e\n\u003ctd\u003eM3\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\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTotal Quantity\u003c\/th\u003e\n\u003ctd\u003e282 Pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003eCompartment case with individual size bags\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 hex key size do I need to drive these screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese M3 socket head cap screws use an M2.5 hex key (Allen wrench). A 2.5 mm hex driver is included in the kit specifications; ensure your driver is the correct size to avoid rounding the socket.\u003c\/p\u003e\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\u003cp\u003eThe black oxide finish provides moderate corrosion resistance, but carbon steel is not inherently rust-proof. For prolonged outdoor or high-humidity exposure, consider applying a light coat of oil or using stainless steel fasteners instead.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between 12.9 grade and standard 8.8 grade screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGrade 12.9 fasteners have a minimum tensile strength of approximately 1220 MPa, compared to 800 MPa for grade 8.8. This makes 12.9 screws significantly stronger and better suited for high-stress or precision-clamping applications such as 3D printer frames and mechanical assemblies.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eHow many screws of each length are included?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe kit contains 282 pieces total across 10 lengths (M3 × 3 mm through 20 mm) plus M3 hex nuts. The exact per-length count is shown on the packaging label. Each size is individually bagged inside the compartment case.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these compatible with 3D printer frames like Voron or Prusa?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. M3 DIN 912 socket head cap screws are the standard fastener used in most open-source 3D printer designs including Voron, Prusa MK series, and Ender-based builds. The 12.9 grade provides the clamping force needed for frame extrusions and motor mounts.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I reuse these screws after removal?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 12.9 grade carbon steel construction allows repeated installation and removal without significant thread deformation, provided the mating threads are in good condition and the screws are not overtorqued during installation.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does DIN 912 mean?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDIN 912 is a German industrial standard (Deutsches Institut für Normung) that defines the dimensions and tolerances for socket head cap screws. It is widely adopted internationally and ensures dimensional compatibility with other DIN 912-compliant hardware and tooling.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your length above, then add to cart.\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Default Title","offer_id":51091013337362,"sku":"UKC714","price":29.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/TESZ_1O0OSZ3ZMLWU_YRIZO.png?v=1762199779","url":"https:\/\/homediyer.com\/products\/m3-socket-head-cap-screws-nut-kit-282pcs-12-9-grade-black","provider":"HomeDIYer","version":"1.0","type":"link"}