{"title":"Serrated Flanged Hexagon Nuts (DIN 6923) - Black Oxide Alloy Steel (Class 10)","description":"\u003ch1\u003eDIN 6923 Serrated Flanged Hexagon Nuts — Black Oxide Alloy Steel (Class 10)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 6923 Class 10 serrated hexagon flange nuts with black oxide finish are manufactured from boron alloy steel 10B21, quenched and tempered to achieve Class 10 mechanical properties, conforming to DIN 6923. The boron addition in 10B21 significantly enhances hardenability, enabling superior strength-to-weight performance. The integrated serrated flange bearing surface distributes clamping load over a wider area and provides built-in vibration resistance — eliminating the need for a separate lock washer. Surface finish: black oxide (alkaline hot blackening) with oil post-treatment, providing a uniform matte black appearance with negligible dimensional change — ideal for precision-fit and aesthetics-critical high-strength applications. Thread: metric coarse (ISO 68-1). RoHS compliant.\u003c\/p\u003e\n\n\u003ch2\u003eDimensional Data — DIN 6923 Serrated Flange Nut (Black Oxide, Class 10)\u003c\/h2\u003e\n\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 — Width Across Flats (mm)\u003c\/th\u003e\n\u003cth\u003ee — Width Across Corners (mm)\u003c\/th\u003e\n\u003cth\u003em — Nut Height (mm)\u003c\/th\u003e\n\u003cth\u003edc — Flange Dia. (mm)\u003c\/th\u003e\n\u003cth\u003ec — Flange Thickness (mm)\u003c\/th\u003e\n\u003cth\u003eUnit Weight (g)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\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\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e11.8\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.5\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\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e14.2\u003c\/td\u003e\n\u003ctd\u003e1.1\u003c\/td\u003e\n\u003ctd\u003e2.8\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\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e17.9\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e6.0\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\u003e15\u003c\/td\u003e\n\u003ctd\u003e16.64\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e21.8\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e10.5\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\u003c\/td\u003e\n\u003ctd\u003e20.03\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e26.0\u003c\/td\u003e\n\u003ctd\u003e1.8\u003c\/td\u003e\n\u003ctd\u003e18.0\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\u003c\/td\u003e\n\u003ctd\u003e23.36\u003c\/td\u003e\n\u003ctd\u003e14.0\u003c\/td\u003e\n\u003ctd\u003e29.9\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e27.5\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\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e34.5\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e40.0\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\u003e20.0\u003c\/td\u003e\n\u003ctd\u003e42.9\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e76.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eAll dimensions in mm. Unit weight is approximate (calculated at steel density 7.85 g\/cm³); actual weight may vary slightly by batch. Tolerances per DIN 6923. Black oxide coating adds negligible dimensional change (\u0026lt; 2.5 µm); no fit adjustment required.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\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\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eDIN 6923\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eSerrated Hexagon Flange Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBoron Alloy Steel 10B21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrength Class\u003c\/td\u003e\n\u003ctd\u003eClass 10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eBlack Oxide (Blackening) + Oil Post-Treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Thickness\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 2.5 µm (negligible dimensional impact)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange Face\u003c\/td\u003e\n\u003ctd\u003eSerrated (anti-loosening)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd\u003eMetric Coarse Thread (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize Range\u003c\/td\u003e\n\u003ctd\u003eM5 – M20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS Compliant\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFULLERKREG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties — Boron Alloy Steel 10B21 (Class 10)\u003c\/h2\u003e\n\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\u003c\/td\u003e\n\u003ctd\u003eBoron Alloy Steel 10B21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrength Class\u003c\/td\u003e\n\u003ctd\u003eClass 10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProof Load Stress\u003c\/td\u003e\n\u003ctd\u003e1040 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength (min.)\u003c\/td\u003e\n\u003ctd\u003e1040 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYield Strength (min.)\u003c\/td\u003e\n\u003ctd\u003e900 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003eHV 272 – 353\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation (min.)\u003c\/td\u003e\n\u003ctd\u003e9%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Treatment\u003c\/td\u003e\n\u003ctd\u003eQuenched \u0026amp; Tempered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKey Alloying Element\u003c\/td\u003e\n\u003ctd\u003eBoron (B) — enhances hardenability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eLow — black oxide provides mild inhibition; additional oiling recommended for storage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eChemical Composition — Boron Alloy Steel 10B21\u003c\/h2\u003e\n\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\u003eP\u003c\/th\u003e\n\u003cth\u003eS\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\u003eContent (%)\u003c\/td\u003e\n\u003ctd\u003e0.18–0.23\u003c\/td\u003e\n\u003ctd\u003e0.15–0.35\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003e10B21 is a boron-microalloyed steel. The trace addition of boron (B) dramatically improves hardenability, allowing Class 10 strength to be achieved with lower carbon content than conventional medium carbon steels — reducing hydrogen embrittlement risk while maintaining superior mechanical performance. Black oxide (non-electrolytic) further eliminates hydrogen embrittlement risk associated with electroplating processes.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eSurface Treatment — Black Oxide (Blackening)\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eDetail\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\u003eAlkaline hot blackening (chemical conversion coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePost-Treatment\u003c\/td\u003e\n\u003ctd\u003eOil-dipped for corrosion inhibition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating Thickness\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 2.5 µm — no dimensional impact on threads or fit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 24 hours (bare); oil post-treatment extends to ~24–48 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eUniform matte black finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHydrogen Embrittlement Risk\u003c\/td\u003e\n\u003ctd\u003eNone — non-electrolytic process; ideal for Class 10 high-strength fasteners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Purpose\u003c\/td\u003e\n\u003ctd\u003eAesthetics + mild corrosion inhibition + precision fit (indoor \/ dry environments)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS Compliant\u003c\/td\u003e\n\u003ctd\u003eYes — no heavy metals in process\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eBlack oxide is a conversion coating, not a plating. It does not add meaningful corrosion protection for outdoor or humid environments. For outdoor or marine use, consider zinc-plated (Zn Cr3) or stainless steel (A2 \/ A4) alternatives. For Class 10 applications where hydrogen embrittlement is a concern, black oxide is preferred over electroplating.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eBlack Oxide vs Zinc Plated — Class 10 Surface Finish Comparison\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eBlack Oxide (Class 10)\u003c\/th\u003e\n\u003cth\u003eZinc Plated Cr3 (Class 10)\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\u003e\u0026lt; 2.5 µm\u003c\/td\u003e\n\u003ctd\u003e5–25 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 24h (with oil)\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 24h (standard supply)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensional Impact\u003c\/td\u003e\n\u003ctd\u003eNegligible\u003c\/td\u003e\n\u003ctd\u003eMinor (5–25 µm per side)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHydrogen Embrittlement Risk\u003c\/td\u003e\n\u003ctd\u003eNone (non-electrolytic)\u003c\/td\u003e\n\u003ctd\u003eLow (Cr3 + baking per ISO 4042)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical Application\u003c\/td\u003e\n\u003ctd\u003ePrecision fit, aesthetics, indoor high-strength\u003c\/td\u003e\n\u003ctd\u003eGeneral industrial, light outdoor\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\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eClass 10 vs Class 8 vs Class 4 — Strength Comparison\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eClass 4 (Q195)\u003c\/th\u003e\n\u003cth\u003eClass 8 (35K)\u003c\/th\u003e\n\u003cth\u003eClass 10 (10B21) ✔\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength (min.)\u003c\/td\u003e\n\u003ctd\u003e400 MPa\u003c\/td\u003e\n\u003ctd\u003e800 MPa\u003c\/td\u003e\n\u003ctd\u003e1040 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYield Strength (min.)\u003c\/td\u003e\n\u003ctd\u003e320 MPa\u003c\/td\u003e\n\u003ctd\u003e640 MPa\u003c\/td\u003e\n\u003ctd\u003e900 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProof Load Stress\u003c\/td\u003e\n\u003ctd\u003e510 MPa\u003c\/td\u003e\n\u003ctd\u003e800 MPa\u003c\/td\u003e\n\u003ctd\u003e1040 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003eHV 130–302\u003c\/td\u003e\n\u003ctd\u003eHV 250–353\u003c\/td\u003e\n\u003ctd\u003eHV 272–353\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Treatment\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eQ\u0026amp;T\u003c\/td\u003e\n\u003ctd\u003eQ\u0026amp;T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eQ195 low carbon\u003c\/td\u003e\n\u003ctd\u003e35K medium carbon\u003c\/td\u003e\n\u003ctd\u003e10B21 boron alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSelection Guide — DIN 6923 Serrated Flange Nut (Class 10, Black Oxide)\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eRequirement\u003c\/th\u003e\n\u003cth\u003eRecommended Spec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUltra-high-load \/ critical structural joints\u003c\/td\u003e\n\u003ctd\u003eClass 10 Black Oxide ✔\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAesthetic black finish + maximum strength\u003c\/td\u003e\n\u003ctd\u003eClass 10 Black Oxide ✔\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrecision fit — minimal coating thickness critical\u003c\/td\u003e\n\u003ctd\u003eBlack Oxide ✔ (negligible dimensional change)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHydrogen embrittlement risk must be eliminated\u003c\/td\u003e\n\u003ctd\u003eBlack Oxide ✔ (non-electrolytic process)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVibration-resistant joint (no extra washer)\u003c\/td\u003e\n\u003ctd\u003eSerrated flange — no extra washer needed ✔\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndoor \/ dry \/ controlled environment\u003c\/td\u003e\n\u003ctd\u003eClass 10 Black Oxide ✔\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutdoor \/ humid \/ corrosive environment\u003c\/td\u003e\n\u003ctd\u003eConsider Class 10 Zn Cr3 instead\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower cost high-strength option\u003c\/td\u003e\n\u003ctd\u003eConsider Class 8 Black Oxide instead\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eStandard Reference\u003c\/h2\u003e\n\n\u003cp\u003eDIN 6923 specifies hexagon flange nuts with a serrated or plain bearing surface. The serrated variant provides mechanical locking through the teeth on the flange underside, which bite into the mating surface under torque — eliminating the need for a separate spring or toothed washer. Class 10 nuts are manufactured from alloy steel and must be quenched and tempered per DIN EN ISO 898-2. Black oxide (chemical blackening) is a non-electrolytic conversion coating process that carries no hydrogen embrittlement risk — making it particularly suitable for Class 10 and above high-strength fasteners. FULLERKREG manufactures to the current edition of DIN 6923 with full dimensional traceability.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:8px;\"\u003e[ Image 1 ]\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:8px;\"\u003e[ Image 2 ]\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:8px;\"\u003e[ Image 3 ]\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:8px;\"\u003e[ Image 4 ]\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy FULLERKREG\u003c\/h2\u003e\n\n\u003cp\u003e🏭 \u003cstrong\u003eDirect Manufacturer\u003c\/strong\u003e — No middlemen. Factory-direct pricing with full production traceability.\u003cbr\u003e\n📐 \u003cstrong\u003eDIN Precision\u003c\/strong\u003e — Every batch produced and inspected to DIN 6923 dimensional standards.\u003cbr\u003e\n🔩 \u003cstrong\u003eWide Size Range\u003c\/strong\u003e — M5 through M20 in stock; non-standard sizes available on request.\u003cbr\u003e\n📦 \u003cstrong\u003eFlexible MOQ \u0026amp; Packaging\u003c\/strong\u003e — Bulk bags, small boxes, or custom retail packaging to your specification.\u003cbr\u003e\n🌍 \u003cstrong\u003eGlobal Shipping\u003c\/strong\u003e — Direct export from China; experienced with Amazon FBA inbound, sea freight, and air freight.\u003cbr\u003e\n✅ \u003cstrong\u003eRoHS \u0026amp; Material Certs\u003c\/strong\u003e — Mill certificates, RoHS declarations, and inspection reports available on request.\u003cbr\u003e\n🤝 \u003cstrong\u003eOEM \/ Private Label\u003c\/strong\u003e — Custom marking, packaging, and labeling for wholesale partners.\u003c\/p\u003e","products":[{"product_id":"din6923s-10-b-m6","title":"M6-1.0 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-7000 Pcs per Carton","description":"\u003cp\u003e11\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225075311,"sku":"DIN6923S-10-B-M6","price":49.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din6923s-10-b-m8","title":"M8-1.25 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-3000 Pcs per Carton","description":"\u003cp\u003e12\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225173615,"sku":"DIN6923S-10-B-M8","price":45.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din6923s-10-b-m10","title":"M10-1.5 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-1800 Pcs per Carton","description":"\u003cp\u003e13\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225337455,"sku":"DIN6923S-10-B-M10","price":45.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din6923s-10-b-m12","title":"M12-1.75 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-1000 Pcs per Carton","description":"\u003cp\u003e14\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225435759,"sku":"DIN6923S-10-B-M12","price":44.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din6923s-10-b-m14","title":"M14-2.0 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-600 Pcs per Carton","description":"\u003cp\u003e15\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225501295,"sku":"DIN6923S-10-B-M14","price":43.8,"currency_code":"USD","in_stock":true}]},{"product_id":"din6923s-10-b-m16","title":"M16-2.0 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-400 Pcs per Carton","description":"\u003cp\u003e16\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225599599,"sku":"DIN6923S-10-B-M16","price":42.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din6923s-10-b-m20","title":"M20-2.5 Class 10 Black Oxide DIN 6923 Hex Flange Nuts With Serration-200 Pcs per Carton","description":"\u003cp\u003e17\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44112225665135,"sku":"DIN6923S-10-B-M20","price":45.6,"currency_code":"USD","in_stock":true}]}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/collections\/DIN_6923_60bd4c3a-f3cd-4cbc-9a5c-953c39341a58.webp?v=1769431978","url":"https:\/\/www.fullerkr.com\/collections\/din-6923-10-bl.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}