{"title":"Full Thread Hex Bolts (DIN 933) - Black Oxide High Tensile Steel (8.8)","description":"\u003ch1\u003eFull Thread Hex Bolts (DIN 933 \/ GB 5783) — Black Oxide High Tensile Steel Grade 8.8\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 933 \/ GB 5783 Grade 8.8 full thread hex bolts with black oxide finish combine reliable structural strength with a professional matte black appearance and RoHS-compliant mild corrosion protection. Manufactured from 10B21 or 35K medium carbon steel and finished with hot alkaline blackening (black oxide), these bolts are the preferred choice for automotive, machinery, tooling, and precision equipment applications where a non-reflective black finish is required alongside Grade 8.8 structural performance. The fully threaded shank ensures maximum thread engagement and grip-length flexibility. 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 10B21 or 35K Medium Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperty Class:\u003c\/strong\u003e Grade 8.8 (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\u003eCoating Thickness:\u003c\/strong\u003e 0.5–1.5 μm (negligible dimensional impact)\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 M3 – 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\u003eAppearance:\u003c\/strong\u003e Matte black \/ satin black finish\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKey Advantage:\u003c\/strong\u003e No hydrogen embrittlement risk — safe for Grade 8.8 without post-baking\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG DIN 933 Grade 8.8 Black Oxide Hex Bolts?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eGrade 8.8 structural strength\u003c\/strong\u003e — Rm ≥ 800 MPa; the global standard structural bolt grade for general industrial and automotive applications\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eProfessional matte black finish\u003c\/strong\u003e — non-reflective appearance ideal for visible fastening in automotive, machinery, and precision equipment\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNo hydrogen embrittlement risk\u003c\/strong\u003e — hot alkaline blackening process does not introduce hydrogen into the steel, unlike electroplating\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNegligible dimensional impact\u003c\/strong\u003e — 0.5–1.5 μm coating; standard nuts fit without modification\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eRoHS compliant\u003c\/strong\u003e — no hazardous substances; suitable for EU and global markets\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eReduced light reflection\u003c\/strong\u003e — matte surface minimises glare in optical, photographic, and precision instrument applications\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e10B21 \/ 35K steel\u003c\/strong\u003e — boron-alloyed or medium carbon steel with excellent cold heading and hardenability characteristics\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\u003eCost-effective\u003c\/strong\u003e — black oxide is one of the most economical surface treatments for steel fasteners\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\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 (magnetite Fe₃O₄)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte black \/ satin black — uniform, non-reflective 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\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance (bare)\u003c\/td\u003e\n\u003ctd\u003e2–4 hours (bare); significantly improved with oil post-treatment (≥ 24 hours)\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\u003eNone — hot alkaline process does not introduce hydrogen\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThread Tolerance Impact\u003c\/td\u003e\n\u003ctd\u003eNegligible — standard nuts fit without modification\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Resistance\u003c\/td\u003e\n\u003ctd\u003eUp to approx. 150°C continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLight Reflection\u003c\/td\u003e\n\u003ctd\u003eSignificantly reduced — ideal for optical and precision applications\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 long-term outdoor protection, consider hot dip galvanised (HDG) or zinc CR3 plated alternatives.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eGrade 8.8 Black Oxide vs. Other Grade 8.8 Surface Treatments\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eGrade 8.8 Zinc CR3\u003c\/th\u003e\n      \u003cth\u003eGrade 8.8 Black Oxide — This Product\u003c\/th\u003e\n      \u003cth\u003eGrade 8.8 HDG\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eBright silver\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMatte black ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMatte grey\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating Thickness\u003c\/td\u003e\n\u003ctd\u003e5–12 μm\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e0.5–1.5 μm ✅ (thinnest)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e45–100 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 72 hours\u003c\/td\u003e\n\u003ctd\u003e2–4 hours (bare)\u003c\/td\u003e\n\u003ctd\u003e≥ 1,000+ hours\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eH₂ Embrittlement Risk\u003c\/td\u003e\n\u003ctd\u003eLow (electroplating)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNone ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThread Fit\u003c\/td\u003e\n\u003ctd\u003eStandard nuts ✅\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard nuts ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRequires HDG nuts\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\u003e\u003cstrong\u003eNegligible ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSignificant\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLight Reflection\u003c\/td\u003e\n\u003ctd\u003eHigh (bright)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eVery low (matte) ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow (matte)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS Compliant\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCost\u003c\/td\u003e\n\u003ctd\u003eLow\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eLowest ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigher\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eGeneral indoor\/outdoor\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eAutomotive, machinery, optics ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStructural outdoor\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eGrade 8.8 vs. Other Property Classes\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eGrade 4.8\u003c\/th\u003e\n      \u003cth\u003eGrade 8.8 — This Product\u003c\/th\u003e\n      \u003cth\u003eGrade 10.9\u003c\/th\u003e\n      \u003cth\u003eGrade 12.9\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\u003e420 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e800 MPa ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1040 MPa\u003c\/td\u003e\n\u003ctd\u003e1220 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Load (Sp) min.\u003c\/td\u003e\n\u003ctd\u003e310 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e600 MPa ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e830 MPa\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\u003e340 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e640 MPa ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e940 MPa\u003c\/td\u003e\n\u003ctd\u003e1100 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElongation (A) min.\u003c\/td\u003e\n\u003ctd\u003e14%\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\u003e—\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e22–32 ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e32–39\u003c\/td\u003e\n\u003ctd\u003e39–44\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical Material\u003c\/td\u003e\n\u003ctd\u003eLow carbon steel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e10B21 \/ 35K ✅\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAlloy steel Q\u0026amp;T\u003c\/td\u003e\n\u003ctd\u003eML40Cr 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\u003eMechanical Properties — Grade 8.8 (ISO 898-1)\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eGrade 8.8 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\u003e8.8 (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\u003e800 MPa (116,000 psi)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Load Stress (Sp) min.\u003c\/td\u003e\n\u003ctd\u003e600 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength (Rp0.2) min.\u003c\/td\u003e\n\u003ctd\u003e640 MPa (80% of Rm)\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\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eReduction of Area (Z) min.\u003c\/td\u003e\n\u003ctd\u003e52%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness min.\u003c\/td\u003e\n\u003ctd\u003e22 HRC \/ 250 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness max.\u003c\/td\u003e\n\u003ctd\u003e32 HRC \/ 320 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) for d \u0026gt; M16; may be non-Q\u0026amp;T for smaller sizes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial Properties — 10B21 \u0026amp; 35K Steel\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003e10B21 (Boron Steel)\u003c\/th\u003e\n      \u003cth\u003e35K (Medium Carbon Steel)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGB\/T Standard\u003c\/td\u003e\n\u003ctd\u003eGB\/T 6478 (CHQ Boron Steel)\u003c\/td\u003e\n\u003ctd\u003eGB\/T 699 (Medium Carbon Steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCarbon Content (C)\u003c\/td\u003e\n\u003ctd\u003e0.18–0.23%\u003c\/td\u003e\n\u003ctd\u003e0.32–0.39%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBoron (B)\u003c\/td\u003e\n\u003ctd\u003e0.0005–0.003%\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eManganese (Mn)\u003c\/td\u003e\n\u003ctd\u003e0.70–1.00%\u003c\/td\u003e\n\u003ctd\u003e0.50–0.80%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardenability\u003c\/td\u003e\n\u003ctd\u003eExcellent (boron-enhanced)\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCold Heading\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eGood\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 8.8 definition\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\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e6.01\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e4.6\u003c\/td\u003e\n\u003ctd\u003e6 – 30\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\u003c\/td\u003e\n\u003ctd\u003e7.66\u003c\/td\u003e\n\u003ctd\u003e2.8\u003c\/td\u003e\n\u003ctd\u003e5.9\u003c\/td\u003e\n\u003ctd\u003e8 – 40\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\u003c\/td\u003e\n\u003ctd\u003e8.79\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e6.9\u003c\/td\u003e\n\u003ctd\u003e10 – 50\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\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\u003eStandard Length Series — Available Bolt Lengths by Size\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread\u003c\/th\u003e\n      \u003cth\u003eStandard Lengths Available (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\u003e6, 8, 10, 12, 16, 20, 25, 30\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e8, 10, 12, 16, 20, 25, 30, 35, 40\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e10, 12, 16, 20, 25, 30, 35, 40, 45, 50\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTightening Torque Reference — Grade 8.8 Black Oxide (Lubricated, μ = 0.12)\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread\u003c\/th\u003e\n      \u003cth\u003eTorque (N·m) — 75% Proof Load\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\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.9\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e2.2\u003c\/td\u003e\n\u003ctd\u003e4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e4.5\u003c\/td\u003e\n\u003ctd\u003e7.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e20.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e33.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e48.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e65.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e170\u003c\/td\u003e\n\u003ctd\u003e87.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e335\u003c\/td\u003e\n\u003ctd\u003e136.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e580\u003c\/td\u003e\n\u003ctd\u003e195.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e1150\u003c\/td\u003e\n\u003ctd\u003e307.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e2000\u003c\/td\u003e\n\u003ctd\u003e445.0\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.\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 bay assembly, suspension components, and chassis fastening where a black finish matches vehicle aesthetics\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eMachinery \u0026amp; industrial equipment\u003c\/strong\u003e — machine frames, equipment enclosures, and general OEM assembly requiring a professional black appearance\u003c\/li\u003e\n  \u003cli\u003e🎭 \u003cstrong\u003eOptical \u0026amp; photographic equipment\u003c\/strong\u003e — camera rigs, telescope mounts, and optical instruments where non-reflective fasteners are essential\u003c\/li\u003e\n  \u003cli\u003e🛠️ \u003cstrong\u003eTooling \u0026amp; jig fixtures\u003c\/strong\u003e — precision fixtures, jigs, and tooling where minimal dimensional impact of the coating is critical\u003c\/li\u003e\n  \u003cli\u003e🎮 \u003cstrong\u003eConsumer electronics \u0026amp; AV equipment\u003c\/strong\u003e — speaker enclosures, rack-mount equipment, and AV installations requiring black hardware\u003c\/li\u003e\n  \u003cli\u003e🏗️ \u003cstrong\u003eArchitectural \u0026amp; interior design\u003c\/strong\u003e — visible fastening in furniture, fixtures, and interior metalwork where black aesthetics are desired\u003c\/li\u003e\n  \u003cli\u003e🤖 \u003cstrong\u003eRobotics \u0026amp; automation\u003c\/strong\u003e — robot frames and automation equipment where black finish reduces visual clutter\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eGeneral manufacturing\u003c\/strong\u003e — cost-effective black fastening for indoor production equipment and assembly lines\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 8.8 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) and ISO 898-1 Grade 8.8 compliance certificates available on request\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustom Requirements:\u003c\/strong\u003e Non-standard sizes, lengths, and thread forms 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 is black oxide and how does it protect steel?\u003c\/strong\u003e\u003cbr\u003e\nA: Black oxide (blackening) is a hot alkaline chemical conversion coating that converts the surface iron into magnetite (Fe₃O₄), creating a thin (0.5–1.5 μm) black layer. It provides mild corrosion inhibition by reducing the surface area exposed to moisture and oxygen. For enhanced protection, apply oil or wax after installation. The primary benefits are the matte black appearance and negligible dimensional impact.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why is black oxide preferred over electroplating for steel bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Black oxide does not introduce hydrogen into the steel during processing, eliminating the risk of hydrogen embrittlement. Electroplating processes (zinc, nickel) can introduce hydrogen, which is a concern for high-strength steels. For Grade 8.8 bolts, hydrogen embrittlement risk is low (below the ~1000 MPa threshold), but black oxide remains the preferred choice for applications requiring zero embrittlement risk and negligible dimensional change.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is black oxide suitable for outdoor use?\u003c\/strong\u003e\u003cbr\u003e\nA: Black oxide alone provides minimal outdoor corrosion protection (2–4 hours salt spray bare). For outdoor applications, apply a compatible oil or wax after installation to extend service life. For prolonged outdoor exposure, FULLERKREG recommends zinc CR3 plated or hot dip galvanised Grade 8.8 bolts for significantly better corrosion protection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do black oxide bolts require special nuts?\u003c\/strong\u003e\u003cbr\u003e\nA: No. The extremely thin black oxide coating (0.5–1.5 μm) has negligible impact on thread dimensions. Standard DIN 934 \/ ISO 4032 Grade 8 hex nuts fit without modification — a key advantage over hot dip galvanised bolts which require specially oversized HDG nuts.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Grade 8.8 and Grade 12.9 black oxide bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Both use black oxide surface treatment, but differ significantly in strength and material. Grade 8.8 (10B21\/35K) has Rm ≥ 800 MPa and is used for general structural and industrial applications. Grade 12.9 (ML40Cr) has Rm ≥ 1220 MPa — 53% stronger — and is used for extreme-load automotive, tooling, and high-stress applications. Choose Grade 8.8 for standard structural use; Grade 12.9 for maximum strength requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What nuts are compatible with Grade 8.8 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Use ISO 4032 \/ DIN 934 Grade 8 hex nuts for Grade 8.8 bolts. Using lower-grade nuts (e.g., Grade 4 or 6) risks thread stripping before the bolt reaches its proof load. FULLERKREG supplies the complete range of compatible Grade 8 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 8.8 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. Always verify fastener selection and torque requirements 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-8-8.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}