{"title":"GB70-85 \/ ISO 4762 Socket Cap Screw Grade 8.8 Black","description":"\u003ch2\u003eFULLERKREG GB70-85 \/ ISO 4762 Grade 8.8 Black Oxide Socket Cap Screws\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG GB70-85 \/ ISO 4762 Grade 8.8 Black Oxide Socket Cap Screws are medium-strength hexagon socket head cap screws manufactured from 10B21 boron steel or 35# carbon steel with a black oxide surface treatment. Conforming to both the Chinese national standard GB 70-85 and the international ISO 4762 standard, these screws offer reliable Grade 8.8 performance with a professional matte black appearance. They are a cost-effective, widely stocked solution for general industrial, machinery, and structural applications.\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 Black oxide (blackening \/ chemical blacking)\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\u003eBlack Oxide Surface Treatment\u003c\/h2\u003e\n\u003cp\u003eBlack oxide (also known as blackening or chemical blacking) is a conversion coating applied to steel fasteners through a controlled chemical reaction. It produces a uniform matte black finish that provides:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate corrosion resistance\u003c\/strong\u003e — suitable for indoor and dry environments; enhanced with oil or wax post-treatment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced light reflection\u003c\/strong\u003e — ideal for optical, electronic, and precision instrument applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimal dimensional impact\u003c\/strong\u003e — coating thickness typically 1–2 μm, preserving tight tolerances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional appearance\u003c\/strong\u003e — uniform matte black finish preferred in visible assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo restricted substances\u003c\/strong\u003e — black oxide process does not use hexavalent chromium (Cr6+), lead, or other RoHS restricted substances\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eMaterial — Chemical Composition (%)\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG GB70-85 Grade 8.8 black 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\u003eBlack oxide (blackening)\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\u003eSurface Finish Comparison — Black Oxide vs Zinc CR3\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eBlack Oxide\u003c\/th\u003e\n\u003cth\u003eZinc CR3\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\u003eMatte black\u003c\/td\u003e\n\u003ctd\u003eBright silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating thickness\u003c\/td\u003e\n\u003ctd\u003e1–2 μm\u003c\/td\u003e\n\u003ctd\u003e5–12 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion resistance\u003c\/td\u003e\n\u003ctd\u003eModerate (with oil)\u003c\/td\u003e\n\u003ctd\u003eGood (72–120 hrs salt spray)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensional impact\u003c\/td\u003e\n\u003ctd\u003eMinimal\u003c\/td\u003e\n\u003ctd\u003eMinor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS compliance\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant\u003c\/td\u003e\n\u003ctd\u003e✅ Compliant (CR3)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eIndoor, precision, aesthetic applications\u003c\/td\u003e\n\u003ctd\u003eOutdoor, corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e🟢 Economy\u003c\/td\u003e\n\u003ctd\u003e🔵 Slightly higher\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\u003eGrade 8.8 heat treated\u003c\/strong\u003e — reliable medium-strength performance, 800 MPa tensile strength\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack oxide finish\u003c\/strong\u003e — professional matte black appearance with minimal dimensional impact\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\u003eCost-effective\u003c\/strong\u003e — economical choice for high-volume general industrial applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO\/TS16949 quality management\u003c\/strong\u003e — hardness test, tensile 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 black oxide socket cap screws are widely used in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGeneral machinery and industrial equipment assembly\u003c\/li\u003e\n\u003cli\u003eOptical instruments and precision equipment (low reflectivity required)\u003c\/li\u003e\n\u003cli\u003eElectronics enclosures and control panels\u003c\/li\u003e\n\u003cli\u003eAutomotive interior and non-critical components\u003c\/li\u003e\n\u003cli\u003eFurniture and fixture manufacturing\u003c\/li\u003e\n\u003cli\u003eConsumer products and appliances\u003c\/li\u003e\n\u003cli\u003eStructural assemblies in dry or indoor environments\u003c\/li\u003e\n\u003cli\u003eAny application requiring GB 70-85 or ISO 4762 compliant socket cap screws with a black finish\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. In most applications, GB 70-85 and ISO 4762 screws are interchangeable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How durable is the black oxide finish?\u003c\/strong\u003e\u003cbr\u003e\nBlack oxide provides moderate corrosion resistance suitable for indoor and dry environments. For enhanced protection, screws are typically treated with oil or wax after blackening. For outdoor or humid environments, we recommend Zinc CR3 plating instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will black oxide affect the thread dimensions?\u003c\/strong\u003e\u003cbr\u003e\nNo. Black oxide coating is only 1–2 μm thick and has virtually no impact on thread dimensions or fit. This makes it ideal for precision assemblies where tight tolerances must be maintained.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I get material certificates and test reports?\u003c\/strong\u003e\u003cbr\u003e\nYes. PPAP reports, material certificates, hardness test reports, and tensile test reports are available upon request for all FULLERKREG 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\u003eMaterial certificates and test reports available on request\u003c\/li\u003e\n\u003cli\u003ePPAP report 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 black oxide 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\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, 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\/iso4762-8-8black.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}