{"product_id":"500pcs-a2-stainless-steel-button-head-socket-cap-screws-nuts-kit-m3-m4-m5","title":"500PCS A2 Stainless Steel Button Head Socket Cap Screws \u0026 Nuts Assortment Kit – M3 M4 M5 Allen Hex Bolts with Storage Box","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003e500PCS A2 Stainless Steel Button Head Socket Cap Screws \u0026amp; Nuts Kit — M3, M4 \u0026amp; M5 Allen Hex Bolts with Storage Box\u003c\/h2\u003e\n    \u003cp\u003eDigging through a tangled bag of mixed fasteners mid-project wastes time and kills momentum. Whether you're building electronics enclosures, assembling furniture, maintaining motorcycles, or tackling general DIY repairs, having a well-organized, multi-size screw and nut kit on hand means you always have the right fastener ready to go. This 500-piece set covers the three most common metric sizes — M3, M4, and M5 — in four lengths each, paired with matching hex nuts, all stored in a compartmentalized box.\u003c\/p\u003e\n    \u003cp\u003eEvery bolt in this kit is machined from A2-70 (304) stainless steel to ISO 7380 standard, featuring a low-profile button head with Allen (hex socket) drive. Thread pitches are M3×0.5mm, M4×0.7mm, and M5×0.8mm. The kit includes 260 bolts across 12 size combinations and 250 matching hex nuts — totaling 500 pieces. Weight: approx. 0.54 kg.\u003c\/p\u003e\n    \u003cp\u003eIdeal for household and office equipment assembly, electronics and communication device maintenance, ship and machinery industry fastening, furniture construction, and car or motorcycle DIY work where a corrosion-resistant, low-profile bolt head 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: M3 \/ M4 \/ M5 metric threaded applications · ISO 7380 standard · Electronics enclosures · Furniture assembly · Automotive \u0026amp; motorcycle maintenance · General DIY\n  \u003c\/div\u003e\n\n  \u003cdiv\u003e\n    \u003ch2\u003e✅ Key Features of This Button Head Socket Cap Screw Kit\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\u003eA2-70 (304) Stainless Steel — ISO 7380:\u003c\/strong\u003e Corrosion-resistant, wear-resistant, and rust-proof for long-term use in humid, indoor, and light outdoor environments. Grade A2-70 ensures consistent tensile strength across all sizes.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eLow-Profile Button Head Design:\u003c\/strong\u003e The rounded, low-profile head sits flush and clean against surfaces — ideal for applications where a standard hex cap head would protrude or snag. Allen (hex socket) drive minimizes cam-out.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003e500-Piece Multi-Size Assortment:\u003c\/strong\u003e M3, M4, and M5 bolts in 8mm, 12mm, 16mm, and 20mm lengths (quantities vary by size), plus matching hex nuts — covers the most common metric fastener needs in a single kit.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🗂️\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eCompartmentalized Storage Box:\u003c\/strong\u003e Each bolt size and nut size has its own labeled section in the transparent organizer box — no more digging through mixed fasteners to find the right size.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eHex Nuts Included:\u003c\/strong\u003e Matching M3, M4, and M5 hex nuts are included in quantity — no need to source nuts separately. Nuts increase surface contact area, reduce wear, and protect fastener threads.\u003c\/span\u003e\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cspan\u003e\u003cstrong\u003eWide Application Range:\u003c\/strong\u003e Suitable for electronics, furniture, communication equipment, ship assembly, machinery, automotive, and motorcycle maintenance — a single kit that handles most metric fastener tasks.\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\u003eSize\u003c\/th\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003ctd\u003e30 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003ctd\u003e30 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003ctd\u003e30 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003ctd\u003e30 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3 Hex Nut\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e120 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003ctd\u003e20 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003ctd\u003e20 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003ctd\u003e20 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003ctd\u003e20 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM4 Hex Nut\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e80 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003ctd\u003e15 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003ctd\u003e15 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e16mm\u003c\/td\u003e\n\u003ctd\u003e10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5 Button Head Bolt\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003ctd\u003e10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM5 Hex Nut\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e50 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eCompartmentalized Storage Box\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e1 pc\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd colspan=\"2\"\u003e\u003cstrong\u003eTotal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e500 Pieces\u003c\/strong\u003e\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\u003eElectronics \u0026amp; Enclosure Builders\u003c\/strong\u003e\n      \u003cp\u003eThe low-profile button head sits flush on panels and enclosures without snagging — M3 and M4 sizes cover most PCB standoffs, case assembly, and rack-mount hardware needs.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🔧\u003c\/span\u003e\n      \u003cstrong\u003eDIY \u0026amp; Home Repair\u003c\/strong\u003e\n      \u003cp\u003eKeep this kit in the workshop for furniture assembly, appliance repairs, and general household fastening tasks. The storage box means you'll always find the right size quickly.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🏍️\u003c\/span\u003e\n      \u003cstrong\u003eAutomotive \u0026amp; Motorcycle Maintenance\u003c\/strong\u003e\n      \u003cp\u003eM5 bolts handle fairings, brackets, and trim panels on motorcycles and small vehicles where a clean, low-profile head is preferred over a standard hex cap.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🏭\u003c\/span\u003e\n      \u003cstrong\u003eMachinery \u0026amp; Industrial Assembly\u003c\/strong\u003e\n      \u003cp\u003eISO 7380 A2-70 grade meets the requirements for communication equipment, ship assembly, and light machinery applications where corrosion resistance and consistent thread quality matter.\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\u003eTotal Pieces\u003c\/th\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2-70 (304) Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eISO 7380\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eButton Head (Low Profile Round Head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDrive Style\u003c\/th\u003e\n\u003ctd\u003eAllen Key (Hex Socket)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Sizes\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Pitches\u003c\/th\u003e\n\u003ctd\u003eM3 – 0.5mm \/ M4 – 0.7mm \/ M5 – 0.8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBolt Lengths\u003c\/th\u003e\n\u003ctd\u003e8mm, 12mm, 16mm, 20mm (per size)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eNuts Included\u003c\/th\u003e\n\u003ctd\u003eM3 × 120 pcs \/ M4 × 80 pcs \/ M5 × 50 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMeasurement System\u003c\/th\u003e\n\u003ctd\u003eMetric\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSet Weight\u003c\/th\u003e\n\u003ctd\u003eApprox. 0.54 kg (1.19 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003eCompartmentalized transparent plastic organizer box\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 sizes and quantities are included in this 500-piece kit?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe kit includes M3 bolts (8\/12\/16\/20mm, 30 pcs each) with 120 M3 hex nuts; M4 bolts (8\/12\/16\/20mm, 20 pcs each) with 80 M4 hex nuts; and M5 bolts (8\/12\/16\/20mm, 10–15 pcs each) with 50 M5 hex nuts — 500 pieces total in a compartmentalized storage box.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat Allen key size do I need for these button head bolts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eDrive sizes vary by bolt diameter: M3 bolts typically use a 2mm hex key, M4 bolts use a 2.5mm hex key, and M5 bolts use a 3mm hex key. An Allen key is not included in this kit — you'll need a standard metric hex key set.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between a button head and a socket cap screw?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBoth use an Allen (hex socket) drive, but button head screws have a wider, lower-profile dome head that distributes load over a larger surface area and sits more flush against the workpiece. Socket cap screws have a taller, narrower cylindrical head with higher clamping force. Button heads are preferred where a clean, low-profile appearance is needed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bolts suitable for outdoor use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA2 (304) stainless steel offers good corrosion resistance for most indoor and sheltered outdoor applications. For prolonged exposure to saltwater or highly corrosive environments, A4 (316) stainless steel would be more appropriate. These bolts are well-suited for general DIY, electronics, furniture, and light machinery use.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does ISO 7380 mean?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eISO 7380 is the international standard for button head socket cap screws. It specifies the dimensions, tolerances, and mechanical properties of the head and thread, ensuring consistent fit and performance across manufacturers. A2-70 refers to the material grade (304 stainless steel) and minimum tensile strength (700 MPa).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these bolts without the included nuts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. If your application has a pre-tapped hole (threaded insert, tapped metal, or threaded plastic), you can use the bolts without the hex nuts. The nuts are included for applications where you're bolting through an untapped material and need a nut on the back side to secure the joint.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread pitch do these bolts use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese bolts use standard metric coarse thread pitches: M3 – 0.5mm, M4 – 0.7mm, M5 – 0.8mm. These are the most common thread pitches for M3–M5 metric fasteners and are compatible with standard metric nuts and tapped holes of the same pitch.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your material and quantity above, then add to cart.\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Default Title","offer_id":50998099902738,"sku":"UKC001","price":16.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/10_993be9b8-ffc0-4e60-957f-b4ecfa476d13.jpg?v=1764929940","url":"https:\/\/homediyer.com\/products\/500pcs-a2-stainless-steel-button-head-socket-cap-screws-nuts-kit-m3-m4-m5","provider":"HomeDIYer","version":"1.0","type":"link"}