{"title":"Full Thread Hex Bolts (DIN 933) - Black Oxide High Tensile Steel (12.9)","description":"\u003ch1\u003eFull Thread Hex Bolts (DIN 933 \/ GB 5783) — Black Oxide High Tensile Steel Grade 12.9 (ML40Cr)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 933 \/ GB 5783 Grade 12.9 full thread hex bolts are manufactured from ML40Cr alloy steel — a chromium-molybdenum alloyed medium carbon steel specifically engineered for ultra-high tensile fastener applications. With a minimum tensile strength of \u003cstrong\u003e1220 MPa (177,000 psi)\u003c\/strong\u003e and proof load of 1100 MPa, these are among the strongest standard hex bolts available, finished with a black oxide (blackening) surface treatment for corrosion inhibition and a distinctive matte black appearance. The fully threaded shank ensures maximum thread engagement and grip-length flexibility across all demanding applications. Compliant with DIN 933, GB 5783, and ISO 4017 standards.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e FULLERKREG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e DIN 933 \/ GB 5783 \/ ISO 4017\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e ML40Cr Alloy Steel (Chromium-Alloyed Medium Carbon Steel)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperty Class:\u003c\/strong\u003e Grade 12.9 (per ISO 898-1 \/ DIN EN ISO 898-1)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Full Thread (Fully Threaded Shank)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Black Oxide (Blackening \/ 发黑)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type:\u003c\/strong\u003e Hexagon (Hex Head)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize Range:\u003c\/strong\u003e M6 – M36\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e Metric coarse thread per ISO 261 \/ DIN 13\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKey Feature:\u003c\/strong\u003e Extreme-strength fastener — tensile strength ≥ 1220 MPa (177,000 psi)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG DIN 933 Grade 12.9 Black Oxide Hex Bolts?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eGrade 12.9 — extreme tensile strength\u003c\/strong\u003e — Rm ≥ 1220 MPa (177,000 psi); the highest standard property class for metric hex bolts per ISO 898-1\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eML40Cr alloy steel\u003c\/strong\u003e — chromium-alloyed medium carbon steel providing superior hardenability, toughness, and fatigue resistance vs. plain carbon steel\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eBlack oxide finish\u003c\/strong\u003e — provides mild corrosion inhibition, reduces light reflection, and delivers a professional matte black appearance\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eFull thread design\u003c\/strong\u003e — maximum thread engagement; ideal for through-bolting and variable grip-length applications\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eHigh proof load\u003c\/strong\u003e — 1100 MPa minimum proof load for maximum preload and clamping force\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSuperior fatigue resistance\u003c\/strong\u003e — alloy steel microstructure resists cyclic loading and vibration-induced loosening\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eTriple standard compliance\u003c\/strong\u003e — DIN 933 \/ GB 5783 \/ ISO 4017 for global market acceptance\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWholesale \u0026amp; bulk supply\u003c\/strong\u003e — available in large quantities for automotive, machinery, and industrial distributors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eGrade 12.9 vs. Other Property Classes — Strength Comparison\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eGrade 8.8\u003c\/th\u003e\n      \u003cth\u003eGrade 10.9\u003c\/th\u003e\n      \u003cth\u003eGrade 12.9 — This Product\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm) min.\u003c\/td\u003e\n\u003ctd\u003e800 MPa\u003c\/td\u003e\n\u003ctd\u003e1040 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1220 MPa ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Load (Sp) min.\u003c\/td\u003e\n\u003ctd\u003e600 MPa\u003c\/td\u003e\n\u003ctd\u003e830 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1100 MPa ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength (Rp0.2) min.\u003c\/td\u003e\n\u003ctd\u003e640 MPa\u003c\/td\u003e\n\u003ctd\u003e940 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1100 MPa ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElongation (A) min.\u003c\/td\u003e\n\u003ctd\u003e12%\u003c\/td\u003e\n\u003ctd\u003e9%\u003c\/td\u003e\n\u003ctd\u003e8%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness (HRC)\u003c\/td\u003e\n\u003ctd\u003e22–32\u003c\/td\u003e\n\u003ctd\u003e32–39\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e39–44 ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness (HV)\u003c\/td\u003e\n\u003ctd\u003e250–320\u003c\/td\u003e\n\u003ctd\u003e320–380\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e380–435 ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical Material\u003c\/td\u003e\n\u003ctd\u003eMedium carbon steel\u003c\/td\u003e\n\u003ctd\u003eAlloy steel (quenched \u0026amp; tempered)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eML40Cr alloy steel (Q\u0026amp;T) ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStrength vs. 8.8\u003c\/td\u003e\n\u003ctd\u003eBaseline\u003c\/td\u003e\n\u003ctd\u003e+30%\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e+53% ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eBlack Oxide Surface Treatment — Properties \u0026amp; Benefits\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProcess\u003c\/td\u003e\n\u003ctd\u003eHot alkaline blackening (chemical conversion coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte black \/ satin black finish\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLayer Thickness\u003c\/td\u003e\n\u003ctd\u003e0.5–1.5 μm (negligible dimensional impact)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Protection\u003c\/td\u003e\n\u003ctd\u003eMild — suitable for indoor and dry environments; oil or wax post-treatment recommended for enhanced protection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e~2–4 hours (bare); significantly improved with oil post-treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLight Reflection\u003c\/td\u003e\n\u003ctd\u003eReduced — non-reflective matte surface\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensional Impact\u003c\/td\u003e\n\u003ctd\u003eNegligible — no significant change to thread tolerances\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS \/ REACH\u003c\/td\u003e\n\u003ctd\u003eCompliant — no hazardous substances\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHydrogen Embrittlement Risk\u003c\/td\u003e\n\u003ctd\u003eLower than electroplating processes — important for Grade 12.9 high-strength bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003e⚠️ Important: Black oxide provides only mild corrosion protection. For outdoor, wet, or corrosive environments, apply a compatible oil, wax, or additional protective coating after installation. For corrosive environments, consider zinc-plated or stainless steel alternatives.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMechanical Properties — Grade 12.9 (ISO 898-1)\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eGrade 12.9 Value\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\u003e12.9 (per ISO 898-1 \/ DIN EN ISO 898-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm) min.\u003c\/td\u003e\n\u003ctd\u003e1220 MPa (177,000 psi)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Load Stress (Sp) min.\u003c\/td\u003e\n\u003ctd\u003e1100 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength (Rp0.2) min.\u003c\/td\u003e\n\u003ctd\u003e1100 MPa (90% of Rm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElongation (A) min.\u003c\/td\u003e\n\u003ctd\u003e8%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eReduction of Area (Z) min.\u003c\/td\u003e\n\u003ctd\u003e44%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness min.\u003c\/td\u003e\n\u003ctd\u003e39 HRC \/ 380 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness max.\u003c\/td\u003e\n\u003ctd\u003e44 HRC \/ 435 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHead Hardness max.\u003c\/td\u003e\n\u003ctd\u003e44 HRC \/ 435 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Treatment\u003c\/td\u003e\n\u003ctd\u003eQuenched \u0026amp; Tempered (Q\u0026amp;T)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial Properties — ML40Cr Alloy Steel\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial Designation\u003c\/td\u003e\n\u003ctd\u003eML40Cr (GB\/T 6478 — Cold Heading Quality Alloy Steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEquivalent Grades\u003c\/td\u003e\n\u003ctd\u003e40Cr (GB) \/ SCr440 (JIS) \/ 5140 (SAE\/AISI) \/ 41Cr4 (DIN)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCarbon Content (C)\u003c\/td\u003e\n\u003ctd\u003e0.37–0.44%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChromium (Cr)\u003c\/td\u003e\n\u003ctd\u003e0.80–1.10%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eManganese (Mn)\u003c\/td\u003e\n\u003ctd\u003e0.50–0.80%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSilicon (Si)\u003c\/td\u003e\n\u003ctd\u003e0.17–0.37%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePhosphorus (P)\u003c\/td\u003e\n\u003ctd\u003e≤ 0.025%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSulfur (S)\u003c\/td\u003e\n\u003ctd\u003e≤ 0.025%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003e7.85 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElastic Modulus\u003c\/td\u003e\n\u003ctd\u003e~206 GPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardenability\u003c\/td\u003e\n\u003ctd\u003eGood — Cr addition significantly improves through-hardening\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eChemical Composition — ML40Cr Alloy Steel\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eElement\u003c\/th\u003e\n      \u003cth\u003eC (%)\u003c\/th\u003e\n      \u003cth\u003eSi (%)\u003c\/th\u003e\n      \u003cth\u003eMn (%)\u003c\/th\u003e\n      \u003cth\u003eCr (%)\u003c\/th\u003e\n      \u003cth\u003eP (%)\u003c\/th\u003e\n      \u003cth\u003eS (%)\u003c\/th\u003e\n      \u003cth\u003eNi (%)\u003c\/th\u003e\n      \u003cth\u003eCu (%)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eML40Cr\u003c\/td\u003e\n      \u003ctd\u003e0.37–0.44\u003c\/td\u003e\n      \u003ctd\u003e0.17–0.37\u003c\/td\u003e\n      \u003ctd\u003e0.50–0.80\u003c\/td\u003e\n      \u003ctd\u003e0.80–1.10\u003c\/td\u003e\n      \u003ctd\u003e≤ 0.025\u003c\/td\u003e\n      \u003ctd\u003e≤ 0.025\u003c\/td\u003e\n      \u003ctd\u003e≤ 0.30\u003c\/td\u003e\n      \u003ctd\u003e≤ 0.25\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eStandard Cross-Reference\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eStandard\u003c\/th\u003e\n      \u003cth\u003eRegion\u003c\/th\u003e\n      \u003cth\u003eDescription\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDIN 933\u003c\/td\u003e\n\u003ctd\u003eGermany \/ Europe\u003c\/td\u003e\n\u003ctd\u003eHexagon head bolts — full thread (metric)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eISO 4017\u003c\/td\u003e\n\u003ctd\u003eInternational\u003c\/td\u003e\n\u003ctd\u003eHexagon head screws — full thread, product grades A and B\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGB 5783\u003c\/td\u003e\n\u003ctd\u003eChina\u003c\/td\u003e\n\u003ctd\u003eHexagon head bolts — full thread (equivalent to DIN 933)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eISO 898-1\u003c\/td\u003e\n\u003ctd\u003eInternational\u003c\/td\u003e\n\u003ctd\u003eMechanical properties of fasteners — Grade 12.9 definition\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGB\/T 6478\u003c\/td\u003e\n\u003ctd\u003eChina\u003c\/td\u003e\n\u003ctd\u003eCold heading quality steel — ML40Cr material specification\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eISO 261 \/ DIN 13\u003c\/td\u003e\n\u003ctd\u003eInternational\u003c\/td\u003e\n\u003ctd\u003eMetric coarse thread specification\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Specifications — DIN 933 \/ ISO 4017 Full Thread Hex Bolts\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Data per DIN 933 \/ ISO 4017 standard.\u003c\/p\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread (d)\u003c\/th\u003e\n      \u003cth\u003ePitch (mm)\u003c\/th\u003e\n      \u003cth\u003es — A\/F (mm)\u003c\/th\u003e\n      \u003cth\u003ee — A\/C (mm)\u003c\/th\u003e\n      \u003cth\u003ek — Head Height (mm)\u003c\/th\u003e\n      \u003cth\u003ed_w min (mm)\u003c\/th\u003e\n      \u003cth\u003eLength Range (mm)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e11.05\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e8.9\u003c\/td\u003e\n\u003ctd\u003e10 – 80\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\u003c\/td\u003e\n\u003ctd\u003e14.38\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e11.6\u003c\/td\u003e\n\u003ctd\u003e16 – 100\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\u003c\/td\u003e\n\u003ctd\u003e18.90\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e14.6\u003c\/td\u003e\n\u003ctd\u003e20 – 120\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\u003e19\u003c\/td\u003e\n\u003ctd\u003e21.10\u003c\/td\u003e\n\u003ctd\u003e7.5\u003c\/td\u003e\n\u003ctd\u003e16.6\u003c\/td\u003e\n\u003ctd\u003e25 – 150\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\u003e22\u003c\/td\u003e\n\u003ctd\u003e24.49\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003e19.6\u003c\/td\u003e\n\u003ctd\u003e30 – 150\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\u003c\/td\u003e\n\u003ctd\u003e26.75\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e22.5\u003c\/td\u003e\n\u003ctd\u003e35 – 200\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\u003c\/td\u003e\n\u003ctd\u003e33.53\u003c\/td\u003e\n\u003ctd\u003e12.5\u003c\/td\u003e\n\u003ctd\u003e27.7\u003c\/td\u003e\n\u003ctd\u003e45 – 200\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\u003c\/td\u003e\n\u003ctd\u003e39.98\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e33.3\u003c\/td\u003e\n\u003ctd\u003e50 – 200\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\u003e46\u003c\/td\u003e\n\u003ctd\u003e50.85\u003c\/td\u003e\n\u003ctd\u003e18.7\u003c\/td\u003e\n\u003ctd\u003e42.8\u003c\/td\u003e\n\u003ctd\u003e60 – 200\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\u003e55\u003c\/td\u003e\n\u003ctd\u003e60.79\u003c\/td\u003e\n\u003ctd\u003e22.5\u003c\/td\u003e\n\u003ctd\u003e51.1\u003c\/td\u003e\n\u003ctd\u003e70 – 200\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* Custom sizes and lengths available on request. Contact FULLERKREG for non-standard requirements.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTightening Torque Reference — Grade 12.9 (Lubricated, μ = 0.12)\u003c\/h2\u003e\n\u003cp\u003eRecommended tightening torques at 75% proof load for Grade 12.9 hex bolts:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread\u003c\/th\u003e\n      \u003cth\u003eTorque (N·m)\u003c\/th\u003e\n      \u003cth\u003eClamp Force (kN)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e18.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e35.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e68\u003c\/td\u003e\n\u003ctd\u003e57.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e117\u003c\/td\u003e\n\u003ctd\u003e83.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e185\u003c\/td\u003e\n\u003ctd\u003e114.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e290\u003c\/td\u003e\n\u003ctd\u003e151.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e570\u003c\/td\u003e\n\u003ctd\u003e236.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e985\u003c\/td\u003e\n\u003ctd\u003e340.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e1960\u003c\/td\u003e\n\u003ctd\u003e535.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e3400\u003c\/td\u003e\n\u003ctd\u003e775.0\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* Torque values are for reference only. Actual requirements depend on friction coefficient, lubrication, joint material, and application. Always consult a qualified engineer for safety-critical applications. Grade 12.9 bolts are susceptible to hydrogen embrittlement — never use with cadmium plating or in hydrogen-rich environments without engineering review.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eApplication Scenarios\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🚗 \u003cstrong\u003eAutomotive \u0026amp; motorsport\u003c\/strong\u003e — engine assembly, suspension components, drivetrain fastening, chassis bolting where maximum strength-to-weight ratio is critical\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eHeavy machinery \u0026amp; industrial equipment\u003c\/strong\u003e — high-load structural connections, press tooling, hydraulic equipment, and heavy-duty OEM assembly\u003c\/li\u003e\n  \u003cli\u003e🏗️ \u003cstrong\u003eConstruction \u0026amp; structural engineering\u003c\/strong\u003e — high-strength structural connections, steel frame assembly, precast concrete lifting inserts\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003ePower generation \u0026amp; energy\u003c\/strong\u003e — turbine assembly, generator fastening, high-vibration power equipment\u003c\/li\u003e\n  \u003cli\u003e🤖 \u003cstrong\u003eRobotics \u0026amp; automation\u003c\/strong\u003e — precision machine frames, robot arm joints, CNC machine tool assembly\u003c\/li\u003e\n  \u003cli\u003e🚂 \u003cstrong\u003eRail \u0026amp; transportation\u003c\/strong\u003e — bogie assembly, track fastening, structural connections in rolling stock\u003c\/li\u003e\n  \u003cli\u003e🛠️ \u003cstrong\u003eTooling \u0026amp; die making\u003c\/strong\u003e — mold clamping, die fastening, precision fixture assembly\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eMining \u0026amp; heavy industry\u003c\/strong\u003e — crusher assembly, conveyor structure, high-impact equipment fastening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG DIN 933 Grade 12.9 Black Oxide Full Thread Hex Bolts — actual product photos:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 1]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 2]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 3]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 4]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eOrdering \u0026amp; Packaging Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Bulk carton \/ polybag per size and length; custom labeling available for OEM and distributor orders\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOQ:\u003c\/strong\u003e Contact FULLERKREG sales for wholesale minimum order quantities\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLead Time:\u003c\/strong\u003e Standard stock sizes ship promptly; large-volume orders subject to production schedule\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e Material test reports (MTR), ISO 898-1 Grade 12.9 compliance certificates, and third-party inspection reports available on request\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustom Requirements:\u003c\/strong\u003e Non-standard sizes, lengths, thread forms, and alternative surface treatments available — contact us\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What does Grade 12.9 mean?\u003c\/strong\u003e\u003cbr\u003e\nA: Grade 12.9 is a property class designation per ISO 898-1. The first number (12) indicates 1\/100 of the nominal tensile strength in MPa — so 12 × 100 = 1200 MPa nominal tensile strength. The second number (9) indicates 90% of the tensile strength as the yield strength ratio — so yield strength = 1200 × 0.9 = 1080 MPa nominal. Minimum tensile strength is 1220 MPa.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is ML40Cr steel and why is it used for Grade 12.9 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: ML40Cr is a cold-heading quality (CHQ) chromium-alloyed medium carbon steel per GB\/T 6478. The “ML” prefix denotes cold heading quality with tighter chemical composition controls for consistent cold forming. The chromium addition (0.80–1.10%) significantly improves hardenability, allowing through-hardening of larger diameter bolts to achieve uniform Grade 12.9 mechanical properties after quench and temper heat treatment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is black oxide and does it provide good corrosion protection?\u003c\/strong\u003e\u003cbr\u003e\nA: Black oxide (blackening) is a chemical conversion coating that creates a thin (0.5–1.5 μm) magnetite (Fe₃O₄) layer on the steel surface. It provides mild corrosion inhibition and reduces light reflection. For enhanced corrosion protection, apply oil or wax after installation. Black oxide is preferred over electroplating for Grade 12.9 bolts because it eliminates the risk of hydrogen embrittlement associated with electroplating processes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why is hydrogen embrittlement a concern for Grade 12.9 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: High-strength steels (above ~1000 MPa) are susceptible to hydrogen embrittlement — a phenomenon where absorbed hydrogen causes sudden brittle fracture under stress. Electroplating processes (zinc, cadmium) introduce hydrogen into the steel. Black oxide avoids this risk, making it the preferred surface treatment for Grade 12.9 and other ultra-high-strength fasteners.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can Grade 12.9 bolts be reused?\u003c\/strong\u003e\u003cbr\u003e\nA: Grade 12.9 bolts tightened to proof load or yield-point tightening should generally not be reused, as they may have experienced permanent deformation. For torque-controlled tightening below proof load, reuse may be acceptable — consult the joint design engineer for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What nuts are compatible with Grade 12.9 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Use ISO 4032 \/ DIN 934 Grade 10 or Grade 12 hex nuts to match the strength of Grade 12.9 bolts. Using lower-grade nuts risks thread stripping before the bolt reaches its proof load. FULLERKREG supplies the complete range of compatible high-strength nuts and washers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I get material test reports (MTR)?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. FULLERKREG provides material test reports and ISO 898-1 Grade 12.9 compliance certificates upon request for wholesale and OEM orders.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cem\u003eFULLERKREG — Precision Fasteners to ISO\/DIN\/GB Standards. All technical data is provided for reference. Grade 12.9 bolts must be installed by qualified personnel using calibrated torque equipment. Always verify fastener selection, torque requirements, and hydrogen embrittlement risk with a qualified engineer for structural and safety-critical applications.\u003c\/em\u003e\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/full-thread-hex-bolts-din-933-black-oxide-high-tensile-steel-12-9.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}