{"title":"Socket Flanged Button Screws (ISO 7380-2) - High Tensile Steel (10.9) - Zinc CR3","description":"\u003ch2\u003eFULLERKREG ISO 7380-2 Grade 10.9 Zinc CR3 Flanged Button Head Socket Cap Screws\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG ISO 7380-2 Grade 10.9 Zinc CR3 Flanged Button Head Socket Cap Screws are high-strength fasteners featuring a low-profile dome-shaped button head with an integrated flange and a hexagon socket drive. Manufactured from 10B21 boron-alloyed steel with an electroplated zinc CR3 (trivalent chromate) surface treatment, these screws combine Grade 10.9 tensile strength (min. 1,040 MPa) with the engineering advantages of an integrated flange, reliable corrosion resistance, and full RoHS environmental compliance. The bright silver zinc finish provides a professional appearance while the flange eliminates the need for a separate washer in most applications.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e ISO 7380-2 (2022)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength Grade:\u003c\/strong\u003e 10.9 (heat treated)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 10B21 boron-alloyed steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTensile Strength:\u003c\/strong\u003e Min. 1,040 MPa\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYield Strength:\u003c\/strong\u003e Min. 940 MPa\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e HRC 32–39\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type:\u003c\/strong\u003e Flanged button head (low-profile dome with integrated flange)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Zinc electroplating with CR3 trivalent chromate passivation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlating Thickness:\u003c\/strong\u003e Typically 5–12 μm zinc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSalt Spray Resistance:\u003c\/strong\u003e 24–48 hrs (per ISO 9227)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoHS Compliance:\u003c\/strong\u003e ✅ Fully compliant — CR3 trivalent chromate contains no hexavalent chromium (Cr6+)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Metric coarse, full thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Tolerance:\u003c\/strong\u003e 6g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Type:\u003c\/strong\u003e Hexagon socket (Allen key \/ hex key)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes Available:\u003c\/strong\u003e M4 – M16\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eISO 7380-2 vs ISO 7380-1 — Flanged vs Plain Button Head\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eISO 7380-2 Flanged (This Page)\u003c\/th\u003e\n\u003cth\u003eISO 7380-1 Plain Button Head\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead profile\u003c\/td\u003e\n\u003ctd\u003eLow dome + integrated flange\u003c\/td\u003e\n\u003ctd\u003eLow dome only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBearing surface area\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSignificantly larger (flange)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard button head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWasher required?\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNo — flange acts as integrated washer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSometimes yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePull-through resistance\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSuperior\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad distribution\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExcellent on thin\/soft materials\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly efficiency\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eFaster — one fewer component\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eThin panels, soft materials, high pull-through risk\u003c\/td\u003e\n\u003ctd\u003eGeneral low-profile applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eRoHS Compliance — CR3 Trivalent Chromate Zinc Plating\u003c\/h2\u003e\n\u003cp\u003eThe zinc CR3 coating uses \u003cstrong\u003etrivalent chromium (Cr3+)\u003c\/strong\u003e passivation, replacing the traditional hexavalent chromium (Cr6+) process. This is essential for compliance with international environmental regulations:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eRegulation\u003c\/th\u003e\n\u003cth\u003eRequirement\u003c\/th\u003e\n\u003cth\u003eCR3 Zinc Compliance\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eEU RoHS Directive (2011\/65\/EU)\u003c\/td\u003e\n\u003ctd\u003eNo hexavalent chromium (Cr6+)\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEU REACH Regulation\u003c\/td\u003e\n\u003ctd\u003eNo SVHC restricted substances\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eELV Directive (2000\/53\/EC)\u003c\/td\u003e\n\u003ctd\u003eNo Cr6+ in vehicle components\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChina RoHS (GB\/T 26572)\u003c\/td\u003e\n\u003ctd\u003eNo restricted hazardous substances\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSurface Finish Comparison — Zinc CR3 vs Black Oxide\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eZinc CR3 (This Page)\u003c\/th\u003e\n\u003cth\u003eBlack Oxide\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eBright silver\u003c\/td\u003e\n\u003ctd\u003eMatte black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating thickness\u003c\/td\u003e\n\u003ctd\u003e5–12 μm\u003c\/td\u003e\n\u003ctd\u003e1–2 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalt spray resistance\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e24–48 hrs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow (without oil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS compliance\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant (CR3)\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eOutdoor, humid, RoHS-regulated applications\u003c\/td\u003e\n\u003ctd\u003eIndoor, general industrial\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e🔵 Slightly higher\u003c\/td\u003e\n\u003ctd\u003e🟢 Economy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMaterial — 10B21 Boron Steel Chemical Composition (%)\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG ISO 7380-2 Grade 10.9 Zinc CR3 flanged button head screws are manufactured from 10B21 boron-alloyed steel. The addition of boron (B) significantly improves hardenability, enabling Grade 10.9 mechanical properties with a leaner alloy composition. All values are maximum unless a range is indicated.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003cth\u003eC\u003c\/th\u003e\n\u003cth\u003eSi (max)\u003c\/th\u003e\n\u003cth\u003eMn\u003c\/th\u003e\n\u003cth\u003eP (max)\u003c\/th\u003e\n\u003cth\u003eS (max)\u003c\/th\u003e\n\u003cth\u003eB\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e10B21\u003c\/td\u003e\n\u003ctd\u003e0.18–0.23\u003c\/td\u003e\n\u003ctd\u003e≤0.30\u003c\/td\u003e\n\u003ctd\u003e0.80–1.10\u003c\/td\u003e\n\u003ctd\u003e≤0.030\u003c\/td\u003e\n\u003ctd\u003e≤0.030\u003c\/td\u003e\n\u003ctd\u003e0.0005–0.003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMechanical Properties — Grade 10.9 (ISO 898-1)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eRequirement\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003eMin. 1,040\u003c\/td\u003e\n\u003ctd\u003eMPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYield Strength \/ Proof Load Stress (Rp0.2)\u003c\/td\u003e\n\u003ctd\u003eMin. 940\u003c\/td\u003e\n\u003ctd\u003eMPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Hardness\u003c\/td\u003e\n\u003ctd\u003e32–39\u003c\/td\u003e\n\u003ctd\u003eHRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Hardness (max)\u003c\/td\u003e\n\u003ctd\u003e≤44\u003c\/td\u003e\n\u003ctd\u003eHRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation after fracture (A)\u003c\/td\u003e\n\u003ctd\u003eMin. 9\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction of area (Z)\u003c\/td\u003e\n\u003ctd\u003eMin. 48\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImpact energy (KV) at room temp.\u003c\/td\u003e\n\u003ctd\u003eMin. 37\u003c\/td\u003e\n\u003ctd\u003eJ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Tolerance Class\u003c\/td\u003e\n\u003ctd\u003e6g\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eZinc CR3 (trivalent chromate)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e✅ RoHS \u0026amp; REACH Compliant\u003c\/strong\u003e — CR3 trivalent chromate zinc plating contains no hexavalent chromium (Cr6+), meeting EU RoHS, REACH, ELV, and China RoHS requirements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated flange\u003c\/strong\u003e — built-in washer function eliminates need for separate washer, reducing part count and assembly time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade 10.9 high strength\u003c\/strong\u003e — 1,040 MPa tensile strength for demanding structural and mechanical joints\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior pull-through resistance\u003c\/strong\u003e — large flange bearing area prevents pull-through in thin sheet metal, plastic, and composite materials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZinc CR3 coating\u003c\/strong\u003e — bright silver appearance with 24–48 hours salt spray resistance (ISO 9227)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-profile button head\u003c\/strong\u003e — smooth dome design with clean aesthetic appearance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10B21 boron steel\u003c\/strong\u003e — excellent hardenability and consistent mechanical properties through heat treatment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO 7380-2 (2022) standard\u003c\/strong\u003e — latest revision compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG ISO 7380-2 Grade 10.9 Zinc CR3 flanged button head socket cap screws are widely used in high-strength, RoHS-regulated, and corrosion-exposed applications:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eElectronics and electrical equipment (EU RoHS regulated) with thin panel assemblies\u003c\/li\u003e\n\u003cli\u003eAutomotive body panels and EV (electric vehicle) assemblies (ELV compliant)\u003c\/li\u003e\n\u003cli\u003eOutdoor machinery and equipment requiring corrosion-resistant fasteners\u003c\/li\u003e\n\u003cli\u003eRobotics and automation equipment in humid environments\u003c\/li\u003e\n\u003cli\u003ePlastic and composite material fastening requiring large bearing area\u003c\/li\u003e\n\u003cli\u003eBicycle frames, motorcycle components, and sporting equipment\u003c\/li\u003e\n\u003cli\u003eConsumer electronics and home appliances\u003c\/li\u003e\n\u003cli\u003eAny application requiring Grade 10.9 flanged button head screws with RoHS-compliant zinc plating\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDimensional Specifications — ISO 7380-2 (Unit: mm)\u003c\/h2\u003e\n\u003cp\u003eKey dimensions per ISO 7380-2 (2022). The flange diameter (dc) is the critical additional dimension vs. ISO 7380-1.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread (d)\u003c\/th\u003e\n\u003cth\u003ePitch (p)\u003c\/th\u003e\n\u003cth\u003eHead Dia. dk Max.\u003c\/th\u003e\n\u003cth\u003eHead Dia. dk Min.\u003c\/th\u003e\n\u003cth\u003eFlange Dia. dc Max.\u003c\/th\u003e\n\u003cth\u003eFlange Dia. dc Min.\u003c\/th\u003e\n\u003cth\u003eHead Height k Max.\u003c\/th\u003e\n\u003cth\u003eHead Height k Min.\u003c\/th\u003e\n\u003cth\u003eKey Size s\u003c\/th\u003e\n\u003cth\u003eKey Depth t Min.\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e7.60\u003c\/td\u003e\n\u003ctd\u003e7.36\u003c\/td\u003e\n\u003ctd\u003e9.40\u003c\/td\u003e\n\u003ctd\u003e9.00\u003c\/td\u003e\n\u003ctd\u003e2.20\u003c\/td\u003e\n\u003ctd\u003e1.80\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e1.05\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\u003e9.50\u003c\/td\u003e\n\u003ctd\u003e9.22\u003c\/td\u003e\n\u003ctd\u003e11.80\u003c\/td\u003e\n\u003ctd\u003e11.40\u003c\/td\u003e\n\u003ctd\u003e2.75\u003c\/td\u003e\n\u003ctd\u003e2.25\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e1.35\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\u003e10.50\u003c\/td\u003e\n\u003ctd\u003e10.22\u003c\/td\u003e\n\u003ctd\u003e13.60\u003c\/td\u003e\n\u003ctd\u003e13.20\u003c\/td\u003e\n\u003ctd\u003e3.30\u003c\/td\u003e\n\u003ctd\u003e2.70\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e1.60\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\u003e14.00\u003c\/td\u003e\n\u003ctd\u003e13.57\u003c\/td\u003e\n\u003ctd\u003e17.90\u003c\/td\u003e\n\u003ctd\u003e17.50\u003c\/td\u003e\n\u003ctd\u003e4.40\u003c\/td\u003e\n\u003ctd\u003e3.60\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e2.20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e17.50\u003c\/td\u003e\n\u003ctd\u003e17.05\u003c\/td\u003e\n\u003ctd\u003e22.30\u003c\/td\u003e\n\u003ctd\u003e21.80\u003c\/td\u003e\n\u003ctd\u003e5.50\u003c\/td\u003e\n\u003ctd\u003e4.50\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e2.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e21.00\u003c\/td\u003e\n\u003ctd\u003e20.48\u003c\/td\u003e\n\u003ctd\u003e26.70\u003c\/td\u003e\n\u003ctd\u003e26.20\u003c\/td\u003e\n\u003ctd\u003e6.60\u003c\/td\u003e\n\u003ctd\u003e5.40\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e3.30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e28.00\u003c\/td\u003e\n\u003ctd\u003e27.48\u003c\/td\u003e\n\u003ctd\u003e35.70\u003c\/td\u003e\n\u003ctd\u003e35.20\u003c\/td\u003e\n\u003ctd\u003e8.80\u003c\/td\u003e\n\u003ctd\u003e7.20\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e4.40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between ISO 7380-1 and ISO 7380-2?\u003c\/strong\u003e\u003cbr\u003e\nISO 7380-1 is the plain button head socket cap screw with no flange. ISO 7380-2 adds an integrated flange under the button head, which significantly increases the bearing surface area, acts as a built-in washer, and provides superior pull-through resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Zinc CR3 and traditional yellow zinc (Cr6+)?\u003c\/strong\u003e\u003cbr\u003e\nTraditional yellow zinc chromate uses hexavalent chromium (Cr6+), which is restricted under EU RoHS and REACH regulations. Zinc CR3 uses trivalent chromium (Cr3+), providing equivalent corrosion protection without any restricted substances. CR3 is the environmentally compliant replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I still need a washer with ISO 7380-2 flanged button head screws?\u003c\/strong\u003e\u003cbr\u003e\nIn most applications, no. The integrated flange provides sufficient bearing area to replace a standard flat washer, reducing part count and assembly time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can Grade 10.9 flanged button head screws handle the same torque as Grade 10.9 socket cap screws?\u003c\/strong\u003e\u003cbr\u003e\nNo. Due to the shallower socket depth in the button head design, the maximum recommended tightening torque is lower than for standard socket cap screws (DIN 912) of the same grade. Always use ISO 7380-2 specific torque values.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I get RoHS compliance documentation and material certificates?\u003c\/strong\u003e\u003cbr\u003e\nYes. FULLERKREG provides RoHS compliance declarations, PPAP reports, material certificates, hardness test reports, and tensile test reports upon request.\u003c\/p\u003e\n\n\u003ch2\u003ePackaging \u0026amp; Availability\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eStandard sizes M4 – M16 available in stock\u003c\/li\u003e\n\u003cli\u003eBulk carton packaging; small box and custom packaging available\u003c\/li\u003e\n\u003cli\u003eRoHS compliance documentation and material certificates available on request\u003c\/li\u003e\n\u003cli\u003ePPAP report and test reports available on request\u003c\/li\u003e\n\u003cli\u003eCustom lengths accepted for large orders\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDownload Specification\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/files\/ISO-7380-2-2022.pdf?v=1779083841\" title=\"ISO 7380-2 2022 Flanged Button Head Socket Cap Screw Dimensional Specification PDF\"\u003eISO 7380-2 (2022) — Full Dimensional Specification (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/files\/ISO898-1.pdf?v=1779071673\" title=\"ISO 898-1 Mechanical Properties of Fasteners\"\u003eISO 898-1 — Mechanical Properties of Fasteners (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\n\u003cp\u003eAll FULLERKREG ISO 7380-2 Grade 10.9 Zinc CR3 flanged button head socket cap screws are manufactured under strict quality control procedures including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRockwell hardness test (HRC 32–39)\u003c\/li\u003e\n\u003cli\u003eTensile strength test (min. 1,040 MPa)\u003c\/li\u003e\n\u003cli\u003eSalt spray corrosion test (zinc CR3, 24–48 hrs per ISO 9227)\u003c\/li\u003e\n\u003cli\u003eRoHS substance verification — no hexavalent chromium (Cr6+)\u003c\/li\u003e\n\u003cli\u003eDimensional inspection per ISO 7380-2 (2022), including flange diameter verification\u003c\/li\u003e\n\u003cli\u003eChemical composition analysis (10B21, B content verified)\u003c\/li\u003e\n\u003cli\u003ePPAP documentation available upon request\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor wholesale pricing, bulk orders, RoHS documentation, or technical inquiries, please \u003ca href=\"\/pages\/contact-us\"\u003econtact our sales team\u003c\/a\u003e.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/socket-flanged-button-screws-iso-7380-2-high-tensile-steel-10-9-zinc-cr3.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}