{"title":"DIN 6912 Low Head Socket Cap Screw | Grade 8.8 | 10B21 Steel | Zinc Plated Cr3","description":"\u003ch2\u003eFULLERKREG DIN 6912 Low Head Socket Cap Screws — Grade 8.8 | 10B21 Steel | Zinc Plated Cr3\u003c\/h2\u003e\n\n\u003cp\u003eFULLERKREG DIN 6912 Grade 8.8 low head socket cap screws are high-strength metric fasteners combining a \u003cstrong\u003ereduced-height hex socket head\u003c\/strong\u003e with a \u003cstrong\u003epilot recess (centre hole)\u003c\/strong\u003e in the socket. The pilot recess enables use of a \u003cstrong\u003eball-end hex key at angles up to 25°\u003c\/strong\u003e, making these screws ideal for confined spaces and recessed installations where straight-on access is impossible.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from \u003cstrong\u003e10B21 boron-alloyed carbon steel\u003c\/strong\u003e and heat-treated to \u003cstrong\u003eISO 898-1 Grade 8.8\u003c\/strong\u003e, these screws deliver high tensile and proof load strength for demanding structural and mechanical assemblies. The \u003cstrong\u003ezinc plating with Cr3 (trivalent chromium) passivation\u003c\/strong\u003e provides reliable corrosion protection while remaining fully \u003cstrong\u003eRoHS compliant\u003c\/strong\u003e — free from hexavalent chromium (Cr6+).\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 6912 — Hexagon socket head cap screws with low head and pilot recess\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 10B21 boron-alloyed carbon steel (medium-carbon, boron-treated for hardenability)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperty Class:\u003c\/strong\u003e Grade 8.8 (per ISO 898-1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Zinc plated with Cr3 (trivalent chromium) passivation — RoHS compliant, Cr6+-free\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Low profile (reduced height) hex socket cap head — approximately 60% of standard DIN 912 head height\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive:\u003c\/strong\u003e Internal hex (Allen \/ hex socket) with pilot recess (centre hole)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePilot Recess Advantage:\u003c\/strong\u003e Allows ball-end hex key engagement at up to 25° angle — critical for blind or angled access\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e Metric coarse thread (ISO 68-1), right-hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize Range:\u003c\/strong\u003e M3 to M20\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eDIN 6912 vs. DIN 7984 vs. DIN 912: Key Differences\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eFeature\u003c\/th\u003e\n      \u003cth\u003eDIN 6912 (This Product)\u003c\/th\u003e\n      \u003cth\u003eDIN 7984\u003c\/th\u003e\n      \u003cth\u003eDIN 912 (Standard Socket Cap)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHead Height\u003c\/td\u003e\n      \u003ctd\u003eLow (approx. 60% of DIN 912)\u003c\/td\u003e\n      \u003ctd\u003eLow (approx. 60% of DIN 912)\u003c\/td\u003e\n      \u003ctd\u003eStandard full height\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePilot Recess (Centre Hole)\u003c\/td\u003e\n      \u003ctd\u003e✅ Yes — centre hole in socket\u003c\/td\u003e\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n      \u003ctd\u003e❌ No\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBall-End Hex Key Access\u003c\/td\u003e\n      \u003ctd\u003e✅ Up to 25° off-axis\u003c\/td\u003e\n      \u003ctd\u003e⚠️ Limited — ball-end slips without pilot\u003c\/td\u003e\n      \u003ctd\u003e⚠️ Limited — ball-end slips without pilot\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHex Key Size (e.g. M6)\u003c\/td\u003e\n      \u003ctd\u003e4 mm\u003c\/td\u003e\n      \u003ctd\u003e3 mm (smaller than DIN 6912)\u003c\/td\u003e\n      \u003ctd\u003e5 mm (full size)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHead Diameter dk (e.g. M6)\u003c\/td\u003e\n      \u003ctd\u003e10.0 mm\u003c\/td\u003e\n      \u003ctd\u003e10.0 mm\u003c\/td\u003e\n      \u003ctd\u003e10.0 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eHead Height k (e.g. M6)\u003c\/td\u003e\n      \u003ctd\u003e3.3 mm\u003c\/td\u003e\n      \u003ctd\u003e3.0 mm\u003c\/td\u003e\n      \u003ctd\u003e6.0 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSocket Depth (e.g. M6)\u003c\/td\u003e\n      \u003ctd\u003eDeeper — accommodates pilot recess\u003c\/td\u003e\n      \u003ctd\u003eShallower — no pilot recess\u003c\/td\u003e\n      \u003ctd\u003eFull depth standard socket\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eTorque Capacity\u003c\/td\u003e\n      \u003ctd\u003eMedium — larger hex key than DIN 7984\u003c\/td\u003e\n      \u003ctd\u003eLower — smaller hex key size\u003c\/td\u003e\n      \u003ctd\u003eFull torque capacity\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eClearance Required\u003c\/td\u003e\n      \u003ctd\u003eMinimal — ideal for thin flanges\u003c\/td\u003e\n      \u003ctd\u003eMinimal — ideal for thin flanges\u003c\/td\u003e\n      \u003ctd\u003eStandard clearance needed\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGoverning Standard\u003c\/td\u003e\n      \u003ctd\u003eDIN 6912 \/ ISO 14580\u003c\/td\u003e\n      \u003ctd\u003eDIN 7984\u003c\/td\u003e\n      \u003ctd\u003eDIN 912 \/ ISO 4762\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBest For\u003c\/td\u003e\n      \u003ctd\u003eLow clearance + angled access required\u003c\/td\u003e\n      \u003ctd\u003eLow clearance, straight-on access only\u003c\/td\u003e\n      \u003ctd\u003eGeneral-purpose, high-torque applications\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eMaterial: 10B21 Boron-Alloyed Carbon Steel\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e10B21\u003c\/strong\u003e is a medium-low carbon steel with boron addition (0.0005–0.003% B), widely used for high-strength fastener production. The boron addition significantly improves hardenability — allowing the steel to achieve Grade 8.8 mechanical properties through heat treatment with lower carbon content than conventional carbon steels, resulting in better cold-formability and consistent mechanical performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCarbon content: ~0.18–0.23% (low-to-medium carbon)\u003c\/li\u003e\n  \u003cli\u003eBoron addition: 0.0005–0.003% — enhances hardenability without increasing brittleness\u003c\/li\u003e\n  \u003cli\u003eManganese content: ~0.70–1.00% — contributes to strength and hardenability\u003c\/li\u003e\n  \u003cli\u003eExcellent cold-heading formability — consistent head geometry and thread form\u003c\/li\u003e\n  \u003cli\u003eHeat treated (quenched and tempered) to achieve Grade 8.8 mechanical properties\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eMechanical Properties — Grade 8.8 (ISO 898-1)\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n      \u003cth\u003eStandard Reference\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProperty Class\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e10B21 Boron-Alloyed Carbon Steel\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (min.)\u003c\/td\u003e\n\u003ctd\u003e800 MPa\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Load Stress\u003c\/td\u003e\n\u003ctd\u003e600 MPa\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e0.2% Yield Strength (min.)\u003c\/td\u003e\n\u003ctd\u003e640 MPa\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElongation (min.)\u003c\/td\u003e\n\u003ctd\u003e12%\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eReduction of Area (min.)\u003c\/td\u003e\n\u003ctd\u003e52%\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness (Vickers)\u003c\/td\u003e\n\u003ctd\u003e245 – 335 HV\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness (Rockwell)\u003c\/td\u003e\n\u003ctd\u003e22 – 34 HRC\u003c\/td\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eImpact Strength\u003c\/td\u003e\n\u003ctd\u003eGood — quenched \u0026amp; tempered microstructure\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e−50°C to +150°C (continuous)\u003c\/td\u003e\n\u003ctd\u003eISO 898-1 Note\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eSurface Treatment: Zinc Plating with Cr3 Passivation\u003c\/h3\u003e\n\u003cp\u003eFULLERKREG DIN 6912 Grade 8.8 screws are finished with \u003cstrong\u003eelectrolytic zinc plating followed by trivalent chromium (Cr3) passivation\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZinc layer thickness:\u003c\/strong\u003e Typically 5–8 μm (per ISO 4042 \/ DIN 50979)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePassivation:\u003c\/strong\u003e Cr3 (trivalent chromium) — blue-white or iridescent finish\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoHS compliant:\u003c\/strong\u003e Cr3 passivation contains no hexavalent chromium (Cr6+) — fully compliant with EU RoHS Directive 2011\/65\/EU and ELV Directive\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSalt spray resistance:\u003c\/strong\u003e ≥ 72 hours to white corrosion, ≥ 120 hours to red rust (per ISO 9227)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHydrogen embrittlement:\u003c\/strong\u003e Post-plating baking (de-embrittlement) applied for Grade 8.8 per ISO 4042 to eliminate hydrogen embrittlement risk\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAppearance:\u003c\/strong\u003e Bright silver-blue finish; uniform coating\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eDimensional Specifications (DIN 6912)\u003c\/h3\u003e\n\u003cp\u003eAll dimensions per \u003cstrong\u003eDIN 6912:2021\u003c\/strong\u003e. Thread per ISO 68-1 metric coarse.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSize\u003c\/th\u003e\n      \u003cth\u003eThread Pitch (mm)\u003c\/th\u003e\n      \u003cth\u003eHead Dia. dk (mm)\u003c\/th\u003e\n      \u003cth\u003eHead Height k (mm)\u003c\/th\u003e\n      \u003cth\u003eHex Key Size s (mm)\u003c\/th\u003e\n      \u003cth\u003ePilot Recess Dia. (mm)\u003c\/th\u003e\n      \u003cth\u003eCommon Lengths (mm)\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\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e1.65\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e5, 6, 8, 10, 12, 16, 20\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\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e2.2\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e6, 8, 10, 12, 16, 20, 25\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\u003e8.5\u003c\/td\u003e\n\u003ctd\u003e2.75\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e8, 10, 12, 16, 20, 25, 30\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\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e3.3\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e10, 12, 16, 20, 25, 30, 35, 40\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\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e4.4\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e12, 16, 20, 25, 30, 35, 40, 50\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\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e16, 20, 25, 30, 35, 40, 50, 60\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\u003e18.0\u003c\/td\u003e\n\u003ctd\u003e6.6\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e20, 25, 30, 35, 40, 50, 60, 70\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\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e7.7\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e25, 30, 35, 40, 50, 60, 70, 80\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\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e25, 30, 35, 40, 50, 60, 70, 80, 100\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\u003e30.0\u003c\/td\u003e\n\u003ctd\u003e11.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e30, 35, 40, 50, 60, 70, 80, 100\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eAll dimensions are nominal per DIN 6912:2021. Zinc plating adds approximately 5–8 μm per surface — account for this in tight-tolerance applications. Consult FULLERKREG product listings for exact available size\/length combinations. Tolerances per ISO 4759-1.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eThe Pilot Recess: Why It Matters\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003epilot recess\u003c\/strong\u003e (also called centre hole or pilot hole) is a small cylindrical bore at the centre of the hex socket. It serves two critical functions:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBall-end hex key engagement:\u003c\/strong\u003e The pilot recess guides and stabilises the ball end of a ball-point hex key, allowing reliable torque transmission at angles up to \u003cstrong\u003e25° off-axis\u003c\/strong\u003e. Without the pilot recess, ball-end keys tend to slip out of the socket under load.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAlignment aid:\u003c\/strong\u003e The recess acts as a visual and tactile centre reference during assembly, reducing the risk of cam-out and socket damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis feature makes DIN 6912 the preferred choice over DIN 7984 for \u003cstrong\u003erecessed bolt patterns, flanged joints, and any assembly where the fastener is not directly accessible from above\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eInstallation \u0026amp; Torque Guidelines\u003c\/h3\u003e\n\u003cp\u003eRecommended installation torque values for Grade 8.8 DIN 6912 screws (dry, unlubricated, μ = 0.12):\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSize\u003c\/th\u003e\n      \u003cth\u003eRecommended Torque (N·m)\u003c\/th\u003e\n      \u003cth\u003eHex Key Size (mm)\u003c\/th\u003e\n      \u003cth\u003eNotes\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\u003e0.9 – 1.1\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003eUse T-handle or short-arm key; avoid over-torque\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e2.2 – 2.7\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e4.5 – 5.5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e7.5 – 9.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e18 – 22\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e36 – 43\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e62 – 75\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e100 – 120\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e155 – 185\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e300 – 360\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eTorque values are indicative for dry conditions (μ = 0.12) with standard thread fit. Zinc-plated surfaces: reduce torque by approximately 10–15% vs. dry values, or use a torque factor appropriate for the lubricant\/coating. For critical joints, use a calibrated torque wrench and refer to joint-specific engineering calculations. Do not exceed the maximum torque for the hex key size to avoid socket rounding.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eHydrogen Embrittlement Considerations\u003c\/h3\u003e\n\u003cp\u003eGrade 8.8 fasteners are susceptible to \u003cstrong\u003ehydrogen embrittlement (HE)\u003c\/strong\u003e during electroplating if not properly treated. FULLERKREG applies \u003cstrong\u003epost-plating baking (de-embrittlement heat treatment)\u003c\/strong\u003e per ISO 4042:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBaking temperature: 190–220°C for a minimum of 4 hours within 4 hours of plating\u003c\/li\u003e\n  \u003cli\u003eThis drives out absorbed hydrogen from the steel lattice, restoring ductility\u003c\/li\u003e\n  \u003cli\u003eEliminates the risk of delayed fracture under sustained tensile load\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDo not re-plate or re-heat Grade 8.8 fasteners\u003c\/strong\u003e without re-applying the de-embrittlement process\u003c\/li\u003e\n  \u003cli\u003eFor applications with sustained high tensile loads, specify de-embrittlement certification when ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThin-flange and low-clearance assemblies in automotive, machinery, and structural applications\u003c\/li\u003e\n  \u003cli\u003eEngine components, gearbox housings, and drivetrain assemblies requiring low-profile fastening\u003c\/li\u003e\n  \u003cli\u003eIndustrial machinery frames, conveyor systems, and production equipment\u003c\/li\u003e\n  \u003cli\u003eSteel structures, brackets, and flanged joints where head clearance is limited\u003c\/li\u003e\n  \u003cli\u003ePrecision equipment and instrumentation requiring high clamping force in confined spaces\u003c\/li\u003e\n  \u003cli\u003eAutomotive body panels, chassis components, and interior trim assemblies\u003c\/li\u003e\n  \u003cli\u003eGeneral mechanical engineering where Grade 8.8 strength and low head profile are both required\u003c\/li\u003e\n  \u003cli\u003eAny assembly requiring angled hex key access due to obstructions or recessed bolt patterns\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eCompliance \u0026amp; Standards\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 6912:2021\u003c\/strong\u003e — Hexagon socket head cap screws with low head and pilot recess\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 898-1\u003c\/strong\u003e — Mechanical properties of fasteners made of carbon steel and alloy steel — bolts, screws and studs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 4042\u003c\/strong\u003e — Fasteners: Electroplated coatings (zinc plating, de-embrittlement)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 50979\u003c\/strong\u003e — Electrodeposited coatings: Zinc and zinc alloy coatings on iron or steel with Cr3 passivation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 9227\u003c\/strong\u003e — Corrosion tests in artificial atmospheres: Salt spray tests\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 68-1\u003c\/strong\u003e — Metric screw threads: General plan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 4759-1\u003c\/strong\u003e — Tolerances for fasteners\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoHS Directive 2011\/65\/EU\u003c\/strong\u003e — Cr3 passivation is Cr6+-free and fully compliant\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eELV Directive 2000\/53\/EC\u003c\/strong\u003e — No restricted substances; suitable for automotive applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003ePackaging \u0026amp; Supply\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAvailable in bulk bags, plastic boxes, and custom packaging for OEM and MRO supply\u003c\/li\u003e\n  \u003cli\u003eStandard packaging quantities: 25 pcs, 50 pcs, 100 pcs, 500 pcs, 1000 pcs (size-dependent)\u003c\/li\u003e\n  \u003cli\u003eWholesale and B2B pricing available — contact FULLERKREG for volume quotations\u003c\/li\u003e\n  \u003cli\u003eFull material certifications (mill certs, ISO 898-1 compliance, hardness test reports) available on request\u003c\/li\u003e\n  \u003cli\u003eDe-embrittlement certification available on request for critical applications\u003c\/li\u003e\n  \u003cli\u003eCustom lengths and non-standard sizes available on request (MOQ applies)\u003c\/li\u003e\n  \u003cli\u003eRoHS and REACH compliant documentation available\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhy Choose FULLERKREG DIN 6912 Grade 8.8 Zinc Cr3?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10B21 boron steel — consistent Grade 8.8 mechanical properties with excellent cold-heading formability\u003c\/li\u003e\n  \u003cli\u003eManufactured to DIN 6912:2021 dimensional standards — not nominal equivalents\u003c\/li\u003e\n  \u003cli\u003eGrade 8.8 properties verified per ISO 898-1 with full hardness and tensile traceability\u003c\/li\u003e\n  \u003cli\u003eCr3 zinc plating — RoHS compliant, Cr6+-free, ≥ 72 h white rust \/ ≥ 120 h red rust salt spray resistance\u003c\/li\u003e\n  \u003cli\u003ePost-plating de-embrittlement baking applied — eliminates hydrogen embrittlement risk\u003c\/li\u003e\n  \u003cli\u003ePilot recess geometry precisely formed for reliable ball-end hex key engagement at up to 25°\u003c\/li\u003e\n  \u003cli\u003eFull size range M3–M20 with broad length availability for versatile application coverage\u003c\/li\u003e\n  \u003cli\u003eCompetitive lead times for standard sizes; custom configurations on request\u003c\/li\u003e\n\u003c\/ul\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-6912-low-head-socket-cap-screw-grade-8-8-zinc-cr3.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}