{"title":"DIN 6916 300HV Structural Washer HDG","description":"\u003ch1\u003eDIN 6916 300HV Structural Washer — 45# Carbon Steel, Hot-Dip Galvanized (HDG)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 6916 hardened structural washers are manufactured to DIN 6916 standard (equivalent: ISO 7416, DIN EN 14399-6) in 45# medium carbon steel, quenched and tempered to 300–370 HV hardness, with hot-dip galvanizing (HDG) per ISO 1461. DIN 6916 washers are specifically designed for use in high-tensile structural bolted connections (HV \/ HSFG assemblies) with high-strength bolts of property class 10.9. The washer features 45° chamfers on both inner and outer edges, and is marked H\/HV per DIN 522 for identification in structural assemblies. Hot-dip galvanizing provides a thick, metallurgically bonded zinc coating (45–85 μm per ISO 1461) with excellent long-term corrosion protection and cathodic protection — the industry-standard surface treatment for structural steelwork in outdoor and exposed environments. Inner holes are reamed after galvanizing to restore dimensional tolerances per DIN 6916.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 6916 — equivalent to ISO 7416, DIN EN 14399-6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 45# Medium Carbon Steel (quenched \u0026amp; tempered)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Hot-Dip Galvanizing (HDG) per ISO 1461\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZinc Coating Thickness:\u003c\/strong\u003e 45–85 μm (metallurgically bonded)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 300–370 HV (Product Grade A, per DIN 522)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize Range:\u003c\/strong\u003e M12 – M36\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProfile:\u003c\/strong\u003e Round, chamfered — 45° external chamfer (e) + 45° internal chamfer (c)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarking:\u003c\/strong\u003e H \/ HV per DIN 522 — required for structural assembly identification\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner hole:\u003c\/strong\u003e Reamed after galvanizing to restore DIN 6916 dimensional tolerances\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCathodic protection:\u003c\/strong\u003e HDG zinc sacrificially protects base steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUsed with:\u003c\/strong\u003e High-strength bolts property class 10.9 in HV structural connections\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eRoHS \u0026amp; REACH Compliant\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Specifications — DIN 6916, 45# Carbon Steel HDG\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Per DIN 6916 \/ ISO 7416. Inner hole reamed after HDG to restore tolerances.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eFor Thread\u003c\/th\u003e\n\u003cth\u003ed1 min\u003c\/th\u003e\n\u003cth\u003ed1 max\u003c\/th\u003e\n\u003cth\u003ed2 min\u003c\/th\u003e\n\u003cth\u003ed2 max\u003c\/th\u003e\n\u003cth\u003eh min\u003c\/th\u003e\n\u003cth\u003eh max\u003c\/th\u003e\n\u003cth\u003ee min\u003c\/th\u003e\n\u003cth\u003ee max\u003c\/th\u003e\n\u003cth\u003ec min\u003c\/th\u003e\n\u003cth\u003ec max\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e13.00\u003c\/td\u003e\n\u003ctd\u003e13.27\u003c\/td\u003e\n\u003ctd\u003e23.48\u003c\/td\u003e\n\u003ctd\u003e24.00\u003c\/td\u003e\n\u003ctd\u003e2.7\u003c\/td\u003e\n\u003ctd\u003e3.3\u003c\/td\u003e\n\u003ctd\u003e0.50\u003c\/td\u003e\n\u003ctd\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e15.00\u003c\/td\u003e\n\u003ctd\u003e15.27\u003c\/td\u003e\n\u003ctd\u003e27.48\u003c\/td\u003e\n\u003ctd\u003e28.00\u003c\/td\u003e\n\u003ctd\u003e2.7\u003c\/td\u003e\n\u003ctd\u003e3.3\u003c\/td\u003e\n\u003ctd\u003e0.50\u003c\/td\u003e\n\u003ctd\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e17.00\u003c\/td\u003e\n\u003ctd\u003e17.27\u003c\/td\u003e\n\u003ctd\u003e29.48\u003c\/td\u003e\n\u003ctd\u003e30.00\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e0.75\u003c\/td\u003e\n\u003ctd\u003e1.50\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM18\u003c\/td\u003e\n\u003ctd\u003e19.00\u003c\/td\u003e\n\u003ctd\u003e19.33\u003c\/td\u003e\n\u003ctd\u003e33.38\u003c\/td\u003e\n\u003ctd\u003e34.00\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e0.75\u003c\/td\u003e\n\u003ctd\u003e1.50\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e21.00\u003c\/td\u003e\n\u003ctd\u003e21.33\u003c\/td\u003e\n\u003ctd\u003e36.38\u003c\/td\u003e\n\u003ctd\u003e37.00\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e0.75\u003c\/td\u003e\n\u003ctd\u003e1.50\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM22\u003c\/td\u003e\n\u003ctd\u003e23.00\u003c\/td\u003e\n\u003ctd\u003e23.33\u003c\/td\u003e\n\u003ctd\u003e38.38\u003c\/td\u003e\n\u003ctd\u003e39.00\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e0.75\u003c\/td\u003e\n\u003ctd\u003e1.50\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e25.00\u003c\/td\u003e\n\u003ctd\u003e25.00\u003c\/td\u003e\n\u003ctd\u003e43.38\u003c\/td\u003e\n\u003ctd\u003e44.00\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e4.4\u003c\/td\u003e\n\u003ctd\u003e0.75\u003c\/td\u003e\n\u003ctd\u003e1.50\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e28.00\u003c\/td\u003e\n\u003ctd\u003e28.52\u003c\/td\u003e\n\u003ctd\u003e49.00\u003c\/td\u003e\n\u003ctd\u003e50.00\u003c\/td\u003e\n\u003ctd\u003e4.4\u003c\/td\u003e\n\u003ctd\u003e5.6\u003c\/td\u003e\n\u003ctd\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e2.00\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e31.00\u003c\/td\u003e\n\u003ctd\u003e31.62\u003c\/td\u003e\n\u003ctd\u003e54.80\u003c\/td\u003e\n\u003ctd\u003e56.00\u003c\/td\u003e\n\u003ctd\u003e4.4\u003c\/td\u003e\n\u003ctd\u003e5.6\u003c\/td\u003e\n\u003ctd\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e2.00\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e37.00\u003c\/td\u003e\n\u003ctd\u003e37.62\u003c\/td\u003e\n\u003ctd\u003e64.80\u003c\/td\u003e\n\u003ctd\u003e66.00\u003c\/td\u003e\n\u003ctd\u003e5.4\u003c\/td\u003e\n\u003ctd\u003e6.6\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e2.50\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eAll dimensions in mm per DIN 6916 \/ ISO 7416 after reaming. d1 = inner diameter; d2 = outer diameter; h = thickness; e = external chamfer; c = internal chamfer. Both chamfers at 45°.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHDG vs. Zinc CR3 vs. Black Oxide — Surface Treatment Comparison\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eHDG (This Product)\u003c\/th\u003e\n\u003cth\u003eZinc CR3\u003c\/th\u003e\n\u003cth\u003eBlack Oxide\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating type\u003c\/td\u003e\n\u003ctd\u003eHot-dip zinc (metallurgically bonded)\u003c\/td\u003e\n\u003ctd\u003eElectroplated zinc + CR3\u003c\/td\u003e\n\u003ctd\u003eChemical conversion (\u0026lt;1μm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating thickness\u003c\/td\u003e\n\u003ctd\u003e45–85 μm\u003c\/td\u003e\n\u003ctd\u003e5–12 μm\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCathodic protection\u003c\/td\u003e\n\u003ctd\u003eYes — full cathodic protection\u003c\/td\u003e\n\u003ctd\u003eLimited\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — outdoor structural\u003c\/td\u003e\n\u003ctd\u003eGood — ≥72h NSS\u003c\/td\u003e\n\u003ctd\u003eLight — indoor only\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eService life (outdoor)\u003c\/td\u003e\n\u003ctd\u003e25–50+ years\u003c\/td\u003e\n\u003ctd\u003eLimited\u003c\/td\u003e\n\u003ctd\u003eNot suitable\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInner hole treatment\u003c\/td\u003e\n\u003ctd\u003eReamed after galvanizing\u003c\/td\u003e\n\u003ctd\u003eNo reaming needed\u003c\/td\u003e\n\u003ctd\u003eNo reaming needed\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eHeavy outdoor structural steelwork\u003c\/td\u003e\n\u003ctd\u003eGeneral industrial\u003c\/td\u003e\n\u003ctd\u003eIndoor, black finish\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties — 45# Carbon Steel, HDG\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial Grade\u003c\/td\u003e\n\u003ctd\u003e45# Medium Carbon Steel (GB\/T 699)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eC Content\u003c\/td\u003e\n\u003ctd\u003e0.42 – 0.50%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Treatment\u003c\/td\u003e\n\u003ctd\u003eQuench \u0026amp; Temper (before galvanizing)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e300–370 HV (maintained after HDG)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eHot-Dip Galvanizing per ISO 1461\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Coating Thickness\u003c\/td\u003e\n\u003ctd\u003e45–85 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCathodic protection\u003c\/td\u003e\n\u003ctd\u003eYes — zinc sacrificially protects base steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eExpected service life\u003c\/td\u003e\n\u003ctd\u003e25–50+ years in typical outdoor environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProduct marking\u003c\/td\u003e\n\u003ctd\u003eH \/ HV per DIN 522\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEquivalent standards\u003c\/td\u003e\n\u003ctd\u003eISO 7416 · DIN EN 14399-6 · PN 82039 · UNI 5714 · EU 784\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUsed with bolt class\u003c\/td\u003e\n\u003ctd\u003eProperty class 10.9 (HV structural bolting)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS \/ REACH\u003c\/td\u003e\n\u003ctd\u003eCompliant\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy High Hardness (300–370 HV) Is Required for Structural Washers\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEmbedding prevention:\u003c\/strong\u003e High-tensile structural bolts (class 10.9) are tightened to very high preloads. A soft washer would embed into the connected steel surface, reducing clamping force and compromising joint integrity\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLoad distribution:\u003c\/strong\u003e The hardened washer distributes the high bolt head\/nut bearing load over a larger area without deforming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChamfer function:\u003c\/strong\u003e The 45° external chamfer (e) accommodates the bolt head\/nut fillet radius; the 45° internal chamfer (c) accommodates the bolt shank thread runout\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHDG compatibility:\u003c\/strong\u003e Quench and temper is performed before galvanizing — HDG process temperature (~450°C) does not affect the hardness of 45# steel tempered above 500°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDIN 6916 vs. DIN 125 — Key Differences\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eDIN 6916 (Structural)\u003c\/th\u003e\n\u003cth\u003eDIN 125 (Standard)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e300–370 HV (hardened)\u003c\/td\u003e\n\u003ctd\u003e100–200 HV (soft)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChamfer\u003c\/td\u003e\n\u003ctd\u003e45° inner \u0026amp; outer chamfer\u003c\/td\u003e\n\u003ctd\u003eNo chamfer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMarking\u003c\/td\u003e\n\u003ctd\u003eH \/ HV required\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUsed with\u003c\/td\u003e\n\u003ctd\u003eClass 10.9 HV structural bolts\u003c\/td\u003e\n\u003ctd\u003eGeneral bolted assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eDIN 6916 \/ ISO 7416 \/ EN 14399-6\u003c\/td\u003e\n\u003ctd\u003eDIN 125 \/ ISO 7089\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEmbedding resistance\u003c\/td\u003e\n\u003ctd\u003eHigh — no embedding under preload\u003c\/td\u003e\n\u003ctd\u003eLow — may embed under high load\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eApplication Scenarios\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutdoor high-tensile structural bolting (HV)\u003c\/strong\u003e — steel frame connections with class 10.9 bolts in exposed environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSteel bridges \u0026amp; civil infrastructure\u003c\/strong\u003e — structural joints requiring long-term outdoor corrosion protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustrial buildings \u0026amp; warehouses\u003c\/strong\u003e — outdoor steel frame column and beam connections\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransmission towers \u0026amp; pylons\u003c\/strong\u003e — HDG standard for outdoor high-voltage infrastructure\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoastal \u0026amp; port structures\u003c\/strong\u003e — HDG for salt air environments (non-direct seawater)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAgricultural \u0026amp; rural structures\u003c\/strong\u003e — steel frame connections in humid outdoor conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Photo Gallery\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG DIN 6916 300HV Structural Washer, 45# Carbon Steel, Hot-Dip Galvanized:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 1 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 2 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 3 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 4 ]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eDirect manufacturer\u003c\/strong\u003e — factory in China, no middlemen\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003eStrict DIN dimensional control\u003c\/strong\u003e — 100% inspection on dimensions and hardness\u003c\/li\u003e\n  \u003cli\u003e🌍 \u003cstrong\u003eGlobal export experience\u003c\/strong\u003e — serving distributors in Europe, North America, Southeast Asia\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eFlexible MOQ\u003c\/strong\u003e — small trial orders and large bulk shipments both welcome\u003c\/li\u003e\n  \u003cli\u003e📋 \u003cstrong\u003eFull documentation\u003c\/strong\u003e — material certs, hardness reports, HDG inspection reports, RoHS declarations\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003eFast lead times\u003c\/strong\u003e — standard sizes in stock, ready to ship\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: Does HDG affect the hardness of DIN 6916 washers?\u003c\/strong\u003e\u003cbr\u003e\nA: No. Quench and temper is performed before galvanizing. The HDG process temperature (~450°C) is below the tempering temperature used for 45# steel (typically 500–600°C), so hardness (300–370 HV) is maintained after galvanizing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why is the inner hole reamed after HDG?\u003c\/strong\u003e\u003cbr\u003e\nA: HDG adds 45–85 μm per surface. Without reaming, the inner hole would be undersized and the bolt would not pass through. Reaming after galvanizing restores the inner diameter to DIN 6916 tolerances while maintaining the HDG coating on all other surfaces.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is DIN 6916?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 6916 specifies hardened round washers for high-tensile structural bolting (HV connections). Equivalent to ISO 7416 and DIN EN 14399-6. Hardness 300–370 HV, with 45° inner and outer chamfers, marked H\/HV. Used with property class 10.9 bolts in structural steel connections per EN 1090.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do you provide material test certificates?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. Mill certificates, hardness test reports, HDG coating thickness inspection reports, and RoHS declarations available upon request.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cstrong\u003eFULLERKREG Fasteners\u003c\/strong\u003e — Precision DIN Standard Fasteners, Direct from Manufacturer.\u003cbr\u003e\nFor wholesale inquiries, technical questions, or custom orders, please contact our sales team.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-6916-300hv-structural-washer-hdg.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}