{"product_id":"grade-10-9-flanged-button-head-screws-m3-m8-allen-socket-iso7380-2","title":"Grade 10.9 Flanged Button Head Screws M3–M8, Allen Socket Bolts, ISO7380-2","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eGrade 10.9 Flanged Button Head Screws M3–M8 — High-Tensile Strength, Washer-Free Fastening\u003c\/h2\u003e\n    \u003cp\u003eWhen standard hardware isn’t strong enough, Grade 10.9 flanged button head screws deliver the clamping force your application demands. With a tensile strength of 1040 MPa (151,000 psi) — significantly stronger than Grade 8.8 or A2 stainless — these ISO7380-2 fasteners are built for heavy machinery, automotive components, industrial equipment, and structural assemblies where failure is not an option.\u003c\/p\u003e\n    \u003cp\u003eEach screw features an integrated wide flange that eliminates the need for a separate washer, distributing load evenly and protecting your work surface. The low-profile button head and hex socket (Allen) drive allow high torque application in tight spaces without cam-out. Available fully threaded in M3, M4, M5, M6, and M8, with lengths from 6mm to 40mm. Hex bits are included with every order.\u003c\/p\u003e\n    \u003cp\u003eThese black self-color (uncoated) alloy steel screws are the go-to choice for engine bay fastening, CNC machine frames, RC vehicle chassis, and any application where a clean, snag-free head profile and serious holding power are both 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\u003eThread Compatibility:\u003c\/strong\u003e ISO metric coarse thread (M3 \/ M4 \/ M5 \/ M6 \/ M8) — fits standard metric nuts, tapped holes, and threaded inserts. \u003cstrong\u003eNot compatible with UNC\/UNF inch threads.\u003c\/strong\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv\u003e\n    \u003ch2\u003e✅ Key Features of These Grade 10.9 Flanged Button Head 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\u003eGrade 10.9 High-Tensile Alloy Steel:\u003c\/strong\u003e 1040 MPa tensile strength and 900 MPa yield strength — significantly stronger than Grade 8.8 (800 MPa) or A2-70 stainless (700 MPa). Engineered for high-stress bolted joints.\u003c\/span\u003e\n\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⭕\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eIntegrated Wide Flange:\u003c\/strong\u003e The built-in flange replaces a standard flat washer, distributing clamping load over a wider bearing area, protecting work surfaces, and eliminating the risk of washer loss during assembly.\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 Enables high torque transmission without cam-out. Correct hex bits (2mm–5mm) are included with every order — ready to install straight out of the box.\u003c\/span\u003e\n\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFully Threaded Design:\u003c\/strong\u003e All sizes are fully threaded for maximum grip strength and versatility. Length is measured from the underside of the head, not including head height.\u003c\/span\u003e\n\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eISO7380-2 Standard:\u003c\/strong\u003e Precision dimensions ensure reliable fit with standard metric nuts, tapped holes, and threaded inserts across M3 to M8 sizes.\u003c\/span\u003e\n\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔲\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBlack Self-Color (Uncoated) Finish:\u003c\/strong\u003e Natural alloy steel with light oil for storage protection. Ideal for dry, indoor, or oil-lubricated environments such as engines, machinery, and tooling fixtures.\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\u003eAutomotive \u0026amp; Engine Bay Fastening\u003c\/strong\u003e\n      \u003cp\u003eGrade 10.9 strength handles the vibration and thermal cycling of engine components, brackets, and chassis mounts where standard hardware would loosen or fail.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e⚙️\u003c\/span\u003e\n      \u003cstrong\u003eIndustrial Machinery \u0026amp; CNC Frames\u003c\/strong\u003e\n      \u003cp\u003eThe high clamping force and integrated flange make these screws ideal for securing linear rails, motor mounts, and structural panels on CNC routers and industrial equipment.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🏎️\u003c\/span\u003e\n      \u003cstrong\u003eRC Vehicles \u0026amp; Hobby Builds\u003c\/strong\u003e\n      \u003cp\u003eThe low-profile button head and compact flange keep assemblies snag-free and aerodynamic, while Grade 10.9 strength handles the shock loads of off-road RC and drone frames.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"hdiy-usecase-item\"\u003e\n      \u003cspan\u003e🏠\u003c\/span\u003e\n      \u003cstrong\u003eStructural \u0026amp; Workshop Assemblies\u003c\/strong\u003e\n      \u003cp\u003eWherever a clean, professional fastener with serious holding power is needed — workbench frames, jig fixtures, steel fabrication — these screws deliver without requiring a separate washer.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — ISO7380-2 Flanged Button Head 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\u003eISO7380-2 (Flanged Button Head Socket Cap Screw)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eGrade 10.9 Alloy Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003e1040 MPa (151,000 psi) minimum\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eYield Strength\u003c\/th\u003e\n\u003ctd\u003e900 MPa minimum\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\u003eHead Style\u003c\/th\u003e\n\u003ctd\u003eFlanged Button Head (low-profile dome with integrated washer flange)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eISO Metric Coarse\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Diameters\u003c\/th\u003e\n\u003ctd\u003eM3, M4, M5, M6, M8\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eAvailable Lengths\u003c\/th\u003e\n\u003ctd\u003e6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 30mm, 40mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFully threaded (length measured from underside of head)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBlack self-color (uncoated, light oil for storage)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHex Key Sizes Included\u003c\/th\u003e\n\u003ctd\u003eM3 → 2mm | M4 → 2.5mm | M5 → 3mm | M6 → 4mm | M8 → 5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eNot corrosion-resistant — for dry, indoor, or oil-lubricated environments\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Head Dimensions by Thread Size\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n\u003cth\u003eHead Diameter (mm)\u003c\/th\u003e\n\u003cth\u003eHead Height (mm)\u003c\/th\u003e\n\u003cth\u003eAllen Key Size (mm)\u003c\/th\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.50\u003c\/td\u003e\n\u003ctd\u003e6.9\u003c\/td\u003e\n\u003ctd\u003e1.65\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\u003e0.70\u003c\/td\u003e\n\u003ctd\u003e9.4\u003c\/td\u003e\n\u003ctd\u003e2.2\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\u003e0.80\u003c\/td\u003e\n\u003ctd\u003e11.8\u003c\/td\u003e\n\u003ctd\u003e2.8\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\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e13.6\u003c\/td\u003e\n\u003ctd\u003e3.3\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\u003e17.6\u003c\/td\u003e\n\u003ctd\u003e4.4\u003c\/td\u003e\n\u003ctd\u003e5.0\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\u003eMaterial note:\u003c\/strong\u003e Grade 10.9 alloy steel is not stainless and will rust if exposed to moisture. The black uncoated finish includes light oil for storage protection only. For outdoor or wet environments, apply a rust-preventative coating or use A2\/A4 stainless steel flanged button head screws instead.\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 strong is Grade 10.9 compared to other grades?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGrade 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 typically 800 MPa tensile, and A2-70 stainless is 700 MPa. Grade 10.9 is the standard choice for high-stress bolted joints in automotive, machinery, and structural applications where Grade 8.8 is insufficient.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a washer with these flanged screws?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. The integrated wide flange acts as a built-in washer, distributing clamping load over a wider bearing area and protecting the work surface. This eliminates the need for a separate flat washer in most applications, saves assembly time, and prevents washer loss.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these screws fully threaded? How is the length measured?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, all sizes are fully threaded for maximum grip strength. Length is measured from the underside of the head (not including head height). For example, an M5 × 16mm screw has 16mm of threaded shank below the head flange.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre hex bits included? What sizes?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, the correct hex (Allen) bits are included with every order: M3 → 2mm, M4 → 2.5mm, M5 → 3mm, M6 → 4mm, M8 → 5mm. You’ll have everything needed to install them immediately without sourcing additional tools.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these screws rust? Are they suitable for outdoor use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGrade 10.9 alloy steel is not stainless and will rust if exposed to moisture or outdoor conditions. The black uncoated finish includes light oil for storage protection only. For outdoor or wet environments, apply a rust-preventative coating (paint, zinc spray) or switch to A2\/A4 stainless steel flanged button head screws. These are best suited for dry, indoor, or oil-lubricated applications such as engines, machinery, and tooling.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between ISO7380-1 and ISO7380-2?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eISO7380-1 is a standard button head socket cap screw without a flange. ISO7380-2 adds an integrated wide flange under the head, which acts as a built-in washer. These screws follow ISO7380-2, meaning they include the flange for improved load distribution and surface protection.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread pitch do these screws use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese screws use standard ISO metric coarse thread pitches: M3 × 0.50mm, M4 × 0.70mm, M5 × 0.80mm, M6 × 1.00mm, M8 × 1.25mm. They are compatible with standard metric nuts, tapped holes, and threaded inserts using the same coarse pitch. They are not compatible with metric fine thread or UNC\/UNF inch threads.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these in aluminum or plastic?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, Grade 10.9 flanged button head screws are commonly used with aluminum extrusions, aluminum plate, and engineering plastics. The integrated flange helps prevent pull-through in softer materials. Always pre-drill a clearance hole or use appropriate threaded inserts. Be aware that Grade 10.9 steel and aluminum can experience galvanic corrosion in wet environments — apply a barrier coating or use stainless hardware for outdoor aluminum assemblies.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your \u003cstrong\u003ethread diameter, bolt length, and quantity\u003c\/strong\u003e above, then add to cart.\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"M3 \/ 6mm \/ 100Pcs","offer_id":52196976918802,"sku":"KAYFST017-1","price":6.6,"currency_code":"USD","in_stock":true},{"title":"M3 \/ 10mm \/ 100Pcs","offer_id":52196976951570,"sku":"KAYFST017-2","price":6.9,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 8mm \/ 100Pcs","offer_id":52196976984338,"sku":"KAYFST017-3","price":7.14,"currency_code":"USD","in_stock":true},{"title":"M4 \/ 12mm \/ 100Pcs","offer_id":52196977017106,"sku":"KAYFST017-4","price":7.44,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 10mm \/ 100Pcs","offer_id":52196977049874,"sku":"KAYFST017-5","price":7.5,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 12mm \/ 100Pcs","offer_id":52196977082642,"sku":"KAYFST017-6","price":7.8,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 16mm \/ 100Pcs","offer_id":52196977115410,"sku":"KAYFST017-7","price":8.1,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 20mm \/ 100Pcs","offer_id":52196977148178,"sku":"KAYFST017-8","price":8.4,"currency_code":"USD","in_stock":true},{"title":"M5 \/ 25mm \/ 100Pcs","offer_id":52196977180946,"sku":"KAYFST017-9","price":8.7,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 10mm \/ 100Pcs","offer_id":52196977213714,"sku":"KAYFST017-10","price":8.4,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 16mm \/ 100Pcs","offer_id":52196977246482,"sku":"KAYFST017-11","price":8.94,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 20mm \/ 100Pcs","offer_id":52196977279250,"sku":"KAYFST017-12","price":9.24,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 25mm \/ 80Pcs","offer_id":52196977312018,"sku":"KAYFST017-13","price":9.12,"currency_code":"USD","in_stock":true},{"title":"M6 \/ 30mm \/ 50Pcs","offer_id":52196977344786,"sku":"KAYFST017-14","price":7.95,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 12mm \/ 50Pcs","offer_id":52196977377554,"sku":"KAYFST017-15","price":8.55,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 16mm \/ 50Pcs","offer_id":52196977410322,"sku":"KAYFST017-16","price":8.85,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 20mm \/ 50Pcs","offer_id":52196977443090,"sku":"KAYFST017-17","price":9.39,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 25mm \/ 40Pcs","offer_id":52196977475858,"sku":"KAYFST017-18","price":9.0,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 30mm \/ 30Pcs","offer_id":52196977508626,"sku":"KAYFST017-19","price":8.25,"currency_code":"USD","in_stock":true},{"title":"M8 \/ 40mm \/ 20Pcs","offer_id":52196977541394,"sku":"KAYFST017-20","price":7.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/017.jpg?v=1783492199","url":"https:\/\/homediyer.com\/products\/grade-10-9-flanged-button-head-screws-m3-m8-allen-socket-iso7380-2","provider":"HomeDIYer","version":"1.0","type":"link"}