{"title":"GB70-85 \/ ISO 4762 Socket Cap Screw Grade 8.8 Zinc CR3","description":"\u003ch2\u003eFULLERKREG GB70-85 \/ ISO 4762 Grade 8.8 Socket Cap Screws — Zinc CR3\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG GB70-85 \/ ISO 4762 Grade 8.8 Socket Cap Screws with Zinc CR3 (trivalent chromate) plating are medium-strength hexagon socket head cap screws manufactured from 10B21 boron steel or 35# carbon steel. The electroplated zinc coating with CR3 trivalent chromate passivation provides reliable corrosion protection while meeting international environmental regulations. These screws conform to both the Chinese national standard GB 70-85 and the international ISO 4762 standard, making them suitable for domestic and global supply chains.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e GB 70-85 \/ ISO 4762 \/ DIN 912\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength Grade:\u003c\/strong\u003e 8.8 (heat treated)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 10B21 boron steel or 35# carbon steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTensile Strength:\u003c\/strong\u003e Min. 800 MPa\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYield Strength:\u003c\/strong\u003e Min. 640 MPa\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e HRC 22–32\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\u003eRoHS Compliance:\u003c\/strong\u003e ✅ Fully compliant — CR3 trivalent chromate contains no hexavalent chromium (Cr6+)\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\u003eProduct Class:\u003c\/strong\u003e A (precision)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes Available:\u003c\/strong\u003e M3 – M48\u003c\/li\u003e\n\u003c\/ul\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 governing electronic, automotive, and consumer products:\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\u003eMaterial — Chemical Composition (%)\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG GB70-85 Grade 8.8 socket cap screws are manufactured from 10B21 boron-alloyed steel or 35# medium carbon steel. 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\u003ctr\u003e\n\u003ctd\u003e35# Steel\u003c\/td\u003e\n\u003ctd\u003e0.32–0.39\u003c\/td\u003e\n\u003ctd\u003e0.17–0.37\u003c\/td\u003e\n\u003ctd\u003e0.50–0.80\u003c\/td\u003e\n\u003ctd\u003e≤0.035\u003c\/td\u003e\n\u003ctd\u003e≤0.035\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMechanical Properties — Grade 8.8 (GB 70-85 \/ 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. 800\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. 640\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\u003e22–32\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≤36\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. 12\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. 52\u003c\/td\u003e\n\u003ctd\u003e%\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\u003eGB 70-85 vs ISO 4762 \/ DIN 912 — Standard Comparison\u003c\/h2\u003e\n\u003cp\u003eGB 70-85 is the Chinese national standard for hexagon socket head cap screws issued in 1985. It is dimensionally compatible with ISO 4762 and DIN 912 for most common sizes, making these screws interchangeable in most applications.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eAspect\u003c\/th\u003e\n\u003cth\u003eGB 70-85\u003c\/th\u003e\n\u003cth\u003eISO 4762 \/ DIN 912\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIssuing body\u003c\/td\u003e\n\u003ctd\u003eChina National Standard (GB)\u003c\/td\u003e\n\u003ctd\u003eISO \/ DIN (International \/ German)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYear\u003c\/td\u003e\n\u003ctd\u003e1985\u003c\/td\u003e\n\u003ctd\u003eISO 4762: 2004 \/ DIN 912: 2014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead dimensions\u003c\/td\u003e\n\u003ctd\u003eCompatible for M3–M48\u003c\/td\u003e\n\u003ctd\u003eCompatible for M3–M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread standard\u003c\/td\u003e\n\u003ctd\u003eGB\/T 197 metric thread\u003c\/td\u003e\n\u003ctd\u003eISO 261 metric thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMechanical requirements\u003c\/td\u003e\n\u003ctd\u003eGB\/T 3098.1\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterchangeability\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eGenerally interchangeable for standard sizes\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\u003eGrade 8.8 heat treated\u003c\/strong\u003e — reliable medium-strength performance, 800 MPa tensile strength\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZinc CR3 coating\u003c\/strong\u003e — bright silver appearance with superior corrosion resistance vs. black oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual standard compliance\u003c\/strong\u003e — meets both GB 70-85 (China) and ISO 4762 \/ DIN 912 (international)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10B21 boron steel \/ 35# carbon steel\u003c\/strong\u003e — consistent mechanical properties through heat treatment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide size range\u003c\/strong\u003e — M3 to M48 available in stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO\/TS16949 quality management\u003c\/strong\u003e — hardness test, tensile test, salt spray test, and PPAP report available on request\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG GB70-85 \/ ISO 4762 Grade 8.8 Zinc CR3 socket cap screws are widely used in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eElectronics and electrical equipment (EU RoHS regulated)\u003c\/li\u003e\n\u003cli\u003eAutomotive components and assemblies (ELV compliant)\u003c\/li\u003e\n\u003cli\u003eConsumer electronics and home appliances\u003c\/li\u003e\n\u003cli\u003eGeneral machinery and industrial equipment\u003c\/li\u003e\n\u003cli\u003eStructural assemblies requiring corrosion-resistant, zinc-plated fasteners\u003c\/li\u003e\n\u003cli\u003eExport products requiring RoHS documentation\u003c\/li\u003e\n\u003cli\u003eAny application requiring GB 70-85 or ISO 4762 compliant socket cap screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDimensional Specifications — GB 70-85 \/ ISO 4762 (Unit: mm)\u003c\/h2\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\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\u003cth\u003eBody Dia. ds Max.\u003c\/th\u003e\n\u003cth\u003eBody Dia. ds Min.\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e5.50\u003c\/td\u003e\n\u003ctd\u003e5.32\u003c\/td\u003e\n\u003ctd\u003e3.00\u003c\/td\u003e\n\u003ctd\u003e2.86\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e1.3\u003c\/td\u003e\n\u003ctd\u003e3.00\u003c\/td\u003e\n\u003ctd\u003e2.86\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e7.00\u003c\/td\u003e\n\u003ctd\u003e6.78\u003c\/td\u003e\n\u003ctd\u003e4.00\u003c\/td\u003e\n\u003ctd\u003e3.82\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e4.00\u003c\/td\u003e\n\u003ctd\u003e3.82\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\u003e8.50\u003c\/td\u003e\n\u003ctd\u003e8.28\u003c\/td\u003e\n\u003ctd\u003e5.00\u003c\/td\u003e\n\u003ctd\u003e4.82\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5.00\u003c\/td\u003e\n\u003ctd\u003e4.82\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\u003e10.00\u003c\/td\u003e\n\u003ctd\u003e9.78\u003c\/td\u003e\n\u003ctd\u003e6.00\u003c\/td\u003e\n\u003ctd\u003e5.70\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e6.00\u003c\/td\u003e\n\u003ctd\u003e5.82\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\u003e13.00\u003c\/td\u003e\n\u003ctd\u003e12.73\u003c\/td\u003e\n\u003ctd\u003e8.00\u003c\/td\u003e\n\u003ctd\u003e7.64\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e8.00\u003c\/td\u003e\n\u003ctd\u003e7.78\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\u003e16.00\u003c\/td\u003e\n\u003ctd\u003e15.73\u003c\/td\u003e\n\u003ctd\u003e10.00\u003c\/td\u003e\n\u003ctd\u003e9.64\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e10.00\u003c\/td\u003e\n\u003ctd\u003e9.78\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\u003e18.00\u003c\/td\u003e\n\u003ctd\u003e17.73\u003c\/td\u003e\n\u003ctd\u003e12.00\u003c\/td\u003e\n\u003ctd\u003e11.57\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e12.00\u003c\/td\u003e\n\u003ctd\u003e11.73\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e21.00\u003c\/td\u003e\n\u003ctd\u003e20.67\u003c\/td\u003e\n\u003ctd\u003e14.00\u003c\/td\u003e\n\u003ctd\u003e13.57\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e14.00\u003c\/td\u003e\n\u003ctd\u003e13.73\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\u003e24.00\u003c\/td\u003e\n\u003ctd\u003e23.67\u003c\/td\u003e\n\u003ctd\u003e16.00\u003c\/td\u003e\n\u003ctd\u003e15.57\u003c\/td\u003e\n\u003ctd\u003e14.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e16.00\u003c\/td\u003e\n\u003ctd\u003e15.73\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e30.00\u003c\/td\u003e\n\u003ctd\u003e29.67\u003c\/td\u003e\n\u003ctd\u003e20.00\u003c\/td\u003e\n\u003ctd\u003e19.48\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e20.00\u003c\/td\u003e\n\u003ctd\u003e19.67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e36.00\u003c\/td\u003e\n\u003ctd\u003e35.61\u003c\/td\u003e\n\u003ctd\u003e24.00\u003c\/td\u003e\n\u003ctd\u003e23.48\u003c\/td\u003e\n\u003ctd\u003e19.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e24.00\u003c\/td\u003e\n\u003ctd\u003e23.67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e45.00\u003c\/td\u003e\n\u003ctd\u003e44.61\u003c\/td\u003e\n\u003ctd\u003e30.00\u003c\/td\u003e\n\u003ctd\u003e29.48\u003c\/td\u003e\n\u003ctd\u003e22.0\u003c\/td\u003e\n\u003ctd\u003e15.5\u003c\/td\u003e\n\u003ctd\u003e30.00\u003c\/td\u003e\n\u003ctd\u003e29.67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e54.00\u003c\/td\u003e\n\u003ctd\u003e53.54\u003c\/td\u003e\n\u003ctd\u003e36.00\u003c\/td\u003e\n\u003ctd\u003e35.38\u003c\/td\u003e\n\u003ctd\u003e27.0\u003c\/td\u003e\n\u003ctd\u003e19.0\u003c\/td\u003e\n\u003ctd\u003e36.00\u003c\/td\u003e\n\u003ctd\u003e35.61\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM42\u003c\/td\u003e\n\u003ctd\u003e4.5\u003c\/td\u003e\n\u003ctd\u003e63.00\u003c\/td\u003e\n\u003ctd\u003e62.54\u003c\/td\u003e\n\u003ctd\u003e42.00\u003c\/td\u003e\n\u003ctd\u003e41.38\u003c\/td\u003e\n\u003ctd\u003e32.0\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e42.00\u003c\/td\u003e\n\u003ctd\u003e41.61\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e72.00\u003c\/td\u003e\n\u003ctd\u003e71.54\u003c\/td\u003e\n\u003ctd\u003e48.00\u003c\/td\u003e\n\u003ctd\u003e47.38\u003c\/td\u003e\n\u003ctd\u003e36.0\u003c\/td\u003e\n\u003ctd\u003e28.0\u003c\/td\u003e\n\u003ctd\u003e48.00\u003c\/td\u003e\n\u003ctd\u003e47.61\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: Is GB 70-85 the same as ISO 4762 \/ DIN 912?\u003c\/strong\u003e\u003cbr\u003e\nGB 70-85 is the Chinese national standard issued in 1985 and is dimensionally compatible with ISO 4762 and DIN 912 for standard sizes M3–M48. The mechanical requirements follow GB\/T 3098.1, which aligns closely with ISO 898-1. In most applications, GB 70-85 and ISO 4762 screws are interchangeable.\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 a restricted hazardous substance under EU RoHS and REACH regulations. Zinc CR3 uses trivalent chromium (Cr3+), which provides equivalent or better corrosion protection without any restricted substances. CR3 is the environmentally compliant replacement for Cr6+ chromate.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What corrosion resistance does Zinc CR3 provide?\u003c\/strong\u003e\u003cbr\u003e\nZinc CR3 plating typically provides 72–120 hours of salt spray resistance (per ISO 9227) before red rust appears, depending on plating thickness. This is significantly better than black oxide and suitable for most indoor and sheltered outdoor applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I get RoHS compliance documentation?\u003c\/strong\u003e\u003cbr\u003e\nYes. FULLERKREG provides RoHS compliance declarations, material certificates, and test reports upon request for all zinc CR3 plated products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the minimum order quantity?\u003c\/strong\u003e\u003cbr\u003e\nWe supply both small quantities and large bulk orders. Please contact our sales team for pricing and MOQ details.\u003c\/p\u003e\n\n\u003ch2\u003ePackaging \u0026amp; Availability\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eStandard sizes M3 – M48 available in stock\u003c\/li\u003e\n\u003cli\u003eBulk carton packaging; 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 Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/files\/datasheet_din_912.pdf?v=1778911043\" title=\"DIN 912 ISO 4762 Socket Cap Screw Product Datasheet\"\u003eDIN 912 \/ ISO 4762 — Product Datasheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/files\/Metric_DIN_912_spec.pdf?v=1778911043\" title=\"DIN 912 ISO 4762 Dimensional Specification PDF\"\u003eDIN 912 \/ ISO 4762 — Full Dimensional Specification (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\n\u003cp\u003eAll FULLERKREG GB70-85 \/ ISO 4762 Grade 8.8 Zinc CR3 socket cap screws are manufactured under strict quality control procedures including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRockwell hardness test (HRC 22–32)\u003c\/li\u003e\n\u003cli\u003eTensile strength test (min. 800 MPa)\u003c\/li\u003e\n\u003cli\u003eSalt spray corrosion test (zinc CR3 plating)\u003c\/li\u003e\n\u003cli\u003eRoHS substance verification — no hexavalent chromium (Cr6+)\u003c\/li\u003e\n\u003cli\u003eDimensional inspection per GB 70-85 \/ ISO 4762\u003c\/li\u003e\n\u003cli\u003eChemical composition analysis\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\/gb70-85-iso-4762-socket-cap-screw-grade-8-8-zinc-cr3.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}