{"title":"Partially Threaded Hexagon Bolts (DIN 931) — Grade 8.8 Carbon Steel, Hot Dip Galvanised","description":"\u003ch1\u003ePartially Threaded Hexagon Bolts (DIN 931) — Grade 8.8 Carbon Steel, Hot Dip Galvanised (HDG)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 931 Grade 8.8 partially threaded hexagon bolts are manufactured from medium carbon steel (35K) to Property Class 8.8, with a hot dip galvanised (HDG) surface finish per ISO 10684. Hot dip galvanising deposits a thick zinc coating (typically 45–85 μm) by immersing the fastener in molten zinc at approximately 450°C — providing dramatically superior corrosion protection compared to electroplated zinc (5–8 μm), with a typical outdoor service life of 20–50+ years in moderate environments.\u003c\/p\u003e\n\n\u003cp\u003eThe partially threaded shank — with a smooth unthreaded grip length beneath the head — provides precise shear load transfer through the bolt body, making DIN 931 the preferred choice for structural connections, flanged joints, and outdoor infrastructure where the bolt passes through clearance holes and the thread engages only in the nut or tapped hole. DIN 931 is equivalent to ISO 4014.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIN 931 ≡ ISO 4014 (Partially Threaded Hexagon Head Bolts)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGalvanising Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eISO 10684 (Hot Dip Galvanised Fasteners)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetric coarse per ISO 261 \/ DIN 13\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Coverage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePartial thread — unthreaded grip length beneath head\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHexagon head — driven by open-end wrench, ring spanner, or socket\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel 35K (medium carbon steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProperty Class\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHot Dip Galvanised (HDG) — molten zinc bath at ~450°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZinc Coating Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e45 – 85 μm (per ISO 10684) — vs 5–8 μm for electroplated zinc\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSalt Spray Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥ 1,000 hours to red rust (typical) — vs ~240h for Zinc CR3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutdoor Service Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20–50+ years in moderate environments (C2–C3 per ISO 9223)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Tolerance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOvercut (tapped oversize) after galvanising to restore thread fit — use HDG nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM6 – M64\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25 mm – 300 mm (size-dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelated Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIN 933 Grade 8.8 HDG (fully threaded)  |  ISO 4014  |  ISO 10684  |  ISO 898-1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\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\u003eHead Dimensions — DIN 931 \/ ISO 4014\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Data per DIN 931 \/ ISO 4014 standard. Note: HDG coating (45–85μm) adds measurable thickness — use HDG nuts (overcut) for correct thread fit.\u003c\/p\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 — 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\u003eds — Shank Ø (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\u003e5.7\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\u003e7.64\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\u003e9.64\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\u003e11.57\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\u003e13.57\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\u003e15.57\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\u003e19.48\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\u003e23.48\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003ctd\u003e45.20\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e26.48\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\u003e29.48\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\u003e35.38\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM42\u003c\/td\u003e\n\u003ctd\u003e4.5\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003ctd\u003e71.30\u003c\/td\u003e\n\u003ctd\u003e26.0\u003c\/td\u003e\n\u003ctd\u003e41.38\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e82.60\u003c\/td\u003e\n\u003ctd\u003e30.0\u003c\/td\u003e\n\u003ctd\u003e47.38\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM56\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e93.56\u003c\/td\u003e\n\u003ctd\u003e35.0\u003c\/td\u003e\n\u003ctd\u003e55.26\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM64\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e95\u003c\/td\u003e\n\u003ctd\u003e104.86\u003c\/td\u003e\n\u003ctd\u003e40.0\u003c\/td\u003e\n\u003ctd\u003e63.26\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* s = across flats (A\/F); e = across corners (A\/C); k = head height; ds = unthreaded shank diameter (max). All dimensions per DIN 931 \/ ISO 4014 before galvanising. HDG coating adds 45–85μm per surface — threads are overcut after galvanising to restore fit.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eThread Length (b) — DIN 931 Partial Thread Reference\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread (d)\u003c\/th\u003e\n      \u003cth\u003eb — L ≤ 125 mm\u003c\/th\u003e\n      \u003cth\u003eb — 125 \u0026lt; L ≤ 200 mm\u003c\/th\u003e\n      \u003cth\u003eb — L \u0026gt; 200 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\u003e18\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e26\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e49\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e53\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e79\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e72\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e78\u003c\/td\u003e\n\u003ctd\u003e84\u003c\/td\u003e\n\u003ctd\u003e97\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM42\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e96\u003c\/td\u003e\n\u003ctd\u003e109\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e108\u003c\/td\u003e\n\u003ctd\u003e121\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM56\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e137\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM64\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e153\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* b = threaded length. Grip length = L − b − k (approximate). Per DIN 931 \/ ISO 4014.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Coating Properties\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\u003eBase Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel 35K (medium carbon steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProperty Class\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003e≥ 800 MPa (d ≤ M16) \/ ≥ 830 MPa (d \u0026gt; M16)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLower Yield Strength (ReL)\u003c\/td\u003e\n\u003ctd\u003e≥ 640 MPa (d ≤ M16) \/ ≥ 660 MPa (d \u0026gt; M16)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProof Load Stress (Sp)\u003c\/td\u003e\n\u003ctd\u003e≥ 580 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e245 – 335 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGalvanising Process\u003c\/td\u003e\n\u003ctd\u003eHot dip galvanising — immersion in molten zinc at ~450°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGalvanising Standard\u003c\/td\u003e\n\u003ctd\u003eISO 10684 (Fasteners — Hot Dip Galvanised Coatings)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Coating Thickness\u003c\/td\u003e\n\u003ctd\u003e45 – 85 μm (min. 40μm per ISO 10684)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Coating Type\u003c\/td\u003e\n\u003ctd\u003eMetallurgically bonded zinc-iron alloy layers + pure zinc outer layer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 1,000 hours to red rust (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor Service Life\u003c\/td\u003e\n\u003ctd\u003e20–50+ years (C2–C3 environment per ISO 9223); 10–25 years in C4 industrial\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThread Treatment\u003c\/td\u003e\n\u003ctd\u003eThreads overcut (tapped oversize) after galvanising to restore metric thread fit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNut Requirement\u003c\/td\u003e\n\u003ctd\u003eMust use HDG overcut nuts — standard nuts will NOT fit HDG bolts\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte grey \/ spangled zinc surface\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Limit\u003c\/td\u003e\n\u003ctd\u003eUp to +200°C (zinc coating degrades above this)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHot Dip Galvanised vs Zinc CR3 Electroplated — Key Differences\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eHot Dip Galvanised (This Product)\u003c\/th\u003e\n      \u003cth\u003eZinc CR3 Electroplated\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\u003eImmersion in molten zinc at ~450°C\u003c\/td\u003e\n\u003ctd\u003eElectrodeposition from zinc salt solution\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\u003e5–8 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating type\u003c\/td\u003e\n\u003ctd\u003eMetallurgically bonded Zn-Fe alloy + pure Zn\u003c\/td\u003e\n\u003ctd\u003ePure zinc layer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAdhesion\u003c\/td\u003e\n\u003ctd\u003eMetallurgical bond — cannot be peeled\u003c\/td\u003e\n\u003ctd\u003eMechanical\/electrochemical bond\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt spray resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 1,000 hours to red rust\u003c\/td\u003e\n\u003ctd\u003e≥ 240 hours to red rust\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor service life\u003c\/td\u003e\n\u003ctd\u003e20–50+ years (C2–C3)\u003c\/td\u003e\n\u003ctd\u003e3–10 years (C2–C3)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThread fit\u003c\/td\u003e\n\u003ctd\u003eThreads overcut after galvanising — requires HDG nuts\u003c\/td\u003e\n\u003ctd\u003e5–8μm — does not affect standard thread fit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte grey \/ spangled\u003c\/td\u003e\n\u003ctd\u003eBright silver \/ light blue iridescent\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature limit\u003c\/td\u003e\n\u003ctd\u003e+200°C\u003c\/td\u003e\n\u003ctd\u003e+120°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS compliance\u003c\/td\u003e\n\u003ctd\u003eYes (zinc is RoHS compliant)\u003c\/td\u003e\n\u003ctd\u003eYes (Cr3+ trivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eOutdoor structural, civil engineering, long-term exposure\u003c\/td\u003e\n\u003ctd\u003eGeneral industrial, automotive, indoor\/mild outdoor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCost\u003c\/td\u003e\n\u003ctd\u003eHigher (process cost)\u003c\/td\u003e\n\u003ctd\u003eLower\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eImportant Installation Notes — HDG Fasteners\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e⚠️ HDG nuts required:\u003c\/strong\u003e Hot dip galvanised bolts have threads overcut (tapped oversize) after galvanising to restore thread fit. Standard metric nuts will NOT fit correctly — always use HDG overcut nuts (DIN 934 HDG or equivalent) with HDG bolts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLubrication mandatory:\u003c\/strong\u003e Always apply a suitable lubricant (wax, oil, or zinc-compatible anti-seize) to HDG bolt threads before installation. Dry HDG threads have high friction and can seize or give inaccurate torque readings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTorque values:\u003c\/strong\u003e HDG fasteners require higher torque values than electroplated equivalents due to increased thread friction. Use torque tables specifically for HDG fasteners — do not use standard zinc-plated torque values.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHydrogen embrittlement:\u003c\/strong\u003e HDG process does not involve acid pickling of high-strength steel in the same way as electroplating — HDG Grade 8.8 bolts are not subject to hydrogen embrittlement risk from the galvanising process (unlike electroplated high-strength bolts above 10.9).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGalvanic compatibility:\u003c\/strong\u003e Zinc is anodic to steel — it provides cathodic protection to the base steel. Avoid contact with copper or copper alloys in wet environments, which can accelerate zinc corrosion.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDamaged coating:\u003c\/strong\u003e Minor coating damage (cut edges, drill holes) is self-healing — the surrounding zinc provides cathodic protection to exposed steel areas up to ~2–3mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWeight Reference Table (kg \/ 100 pcs)\u003c\/h2\u003e\n\u003cp\u003eApproximate weights per 100 pieces. Based on carbon steel density (7.85 g\/cm³) plus HDG coating weight (~0.6 kg\/m² for 85μm coating). Actual weight slightly higher than bare steel.\u003c\/p\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eL (mm)\u003c\/th\u003e\n      \u003cth\u003eM6\u003c\/th\u003e\n\u003cth\u003eM8\u003c\/th\u003e\n\u003cth\u003eM10\u003c\/th\u003e\n\u003cth\u003eM12\u003c\/th\u003e\n\u003cth\u003eM16\u003c\/th\u003e\n\u003cth\u003eM20\u003c\/th\u003e\n\u003cth\u003eM24\u003c\/th\u003e\n\u003cth\u003eM30\u003c\/th\u003e\n\u003cth\u003eM36\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e0.17\u003c\/td\u003e\n\u003ctd\u003e0.35\u003c\/td\u003e\n\u003ctd\u003e0.62\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e0.22\u003c\/td\u003e\n\u003ctd\u003e0.47\u003c\/td\u003e\n\u003ctd\u003e0.84\u003c\/td\u003e\n\u003ctd\u003e1.27\u003c\/td\u003e\n\u003ctd\u003e2.50\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e0.27\u003c\/td\u003e\n\u003ctd\u003e0.59\u003c\/td\u003e\n\u003ctd\u003e1.06\u003c\/td\u003e\n\u003ctd\u003e1.61\u003c\/td\u003e\n\u003ctd\u003e3.17\u003c\/td\u003e\n\u003ctd\u003e5.58\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e0.32\u003c\/td\u003e\n\u003ctd\u003e0.71\u003c\/td\u003e\n\u003ctd\u003e1.28\u003c\/td\u003e\n\u003ctd\u003e1.95\u003c\/td\u003e\n\u003ctd\u003e3.85\u003c\/td\u003e\n\u003ctd\u003e6.78\u003c\/td\u003e\n\u003ctd\u003e11.2\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e0.37\u003c\/td\u003e\n\u003ctd\u003e0.83\u003c\/td\u003e\n\u003ctd\u003e1.49\u003c\/td\u003e\n\u003ctd\u003e2.28\u003c\/td\u003e\n\u003ctd\u003e4.53\u003c\/td\u003e\n\u003ctd\u003e7.97\u003c\/td\u003e\n\u003ctd\u003e13.2\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e0.43\u003c\/td\u003e\n\u003ctd\u003e0.95\u003c\/td\u003e\n\u003ctd\u003e1.71\u003c\/td\u003e\n\u003ctd\u003e2.62\u003c\/td\u003e\n\u003ctd\u003e5.21\u003c\/td\u003e\n\u003ctd\u003e9.17\u003c\/td\u003e\n\u003ctd\u003e15.1\u003c\/td\u003e\n\u003ctd\u003e27.9\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e0.53\u003c\/td\u003e\n\u003ctd\u003e1.19\u003c\/td\u003e\n\u003ctd\u003e2.15\u003c\/td\u003e\n\u003ctd\u003e3.29\u003c\/td\u003e\n\u003ctd\u003e6.57\u003c\/td\u003e\n\u003ctd\u003e11.6\u003c\/td\u003e\n\u003ctd\u003e19.1\u003c\/td\u003e\n\u003ctd\u003e35.4\u003c\/td\u003e\n\u003ctd\u003e59.6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e120\u003c\/td\u003e\n\u003ctd\u003e0.64\u003c\/td\u003e\n\u003ctd\u003e1.43\u003c\/td\u003e\n\u003ctd\u003e2.59\u003c\/td\u003e\n\u003ctd\u003e3.96\u003c\/td\u003e\n\u003ctd\u003e7.93\u003c\/td\u003e\n\u003ctd\u003e13.9\u003c\/td\u003e\n\u003ctd\u003e23.1\u003c\/td\u003e\n\u003ctd\u003e42.9\u003c\/td\u003e\n\u003ctd\u003e72.4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e140\u003c\/td\u003e\n\u003ctd\u003e0.74\u003c\/td\u003e\n\u003ctd\u003e1.67\u003c\/td\u003e\n\u003ctd\u003e3.02\u003c\/td\u003e\n\u003ctd\u003e4.63\u003c\/td\u003e\n\u003ctd\u003e9.29\u003c\/td\u003e\n\u003ctd\u003e16.3\u003c\/td\u003e\n\u003ctd\u003e27.1\u003c\/td\u003e\n\u003ctd\u003e50.4\u003c\/td\u003e\n\u003ctd\u003e85.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e1.91\u003c\/td\u003e\n\u003ctd\u003e3.46\u003c\/td\u003e\n\u003ctd\u003e5.30\u003c\/td\u003e\n\u003ctd\u003e10.65\u003c\/td\u003e\n\u003ctd\u003e18.7\u003c\/td\u003e\n\u003ctd\u003e31.1\u003c\/td\u003e\n\u003ctd\u003e57.9\u003c\/td\u003e\n\u003ctd\u003e98.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e2.39\u003c\/td\u003e\n\u003ctd\u003e4.33\u003c\/td\u003e\n\u003ctd\u003e6.64\u003c\/td\u003e\n\u003ctd\u003e13.37\u003c\/td\u003e\n\u003ctd\u003e23.4\u003c\/td\u003e\n\u003ctd\u003e39.0\u003c\/td\u003e\n\u003ctd\u003e72.9\u003c\/td\u003e\n\u003ctd\u003e124\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e240\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e5.20\u003c\/td\u003e\n\u003ctd\u003e7.98\u003c\/td\u003e\n\u003ctd\u003e16.09\u003c\/td\u003e\n\u003ctd\u003e28.2\u003c\/td\u003e\n\u003ctd\u003e47.0\u003c\/td\u003e\n\u003ctd\u003e87.9\u003c\/td\u003e\n\u003ctd\u003e149\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e10.00\u003c\/td\u003e\n\u003ctd\u003e20.17\u003c\/td\u003e\n\u003ctd\u003e35.4\u003c\/td\u003e\n\u003ctd\u003e59.0\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e188\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* Weights include HDG coating. Actual weights may vary by coating thickness. Contact FULLERKREG for precise weight certificates and inspection reports.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🏗️ \u003cstrong\u003eStructural steel construction\u003c\/strong\u003e — steel frame buildings, bridges, and civil infrastructure requiring long-term outdoor corrosion protection\u003c\/li\u003e\n  \u003cli\u003e🛠️ \u003cstrong\u003eTransmission towers \u0026amp; pylons\u003c\/strong\u003e — power line towers, communication masts, and lattice structures exposed to weather for decades\u003c\/li\u003e\n  \u003cli\u003e🌿 \u003cstrong\u003eAgricultural \u0026amp; rural structures\u003c\/strong\u003e — farm buildings, grain silos, fencing, and rural infrastructure in corrosive environments\u003c\/li\u003e\n  \u003cli\u003e🚢 \u003cstrong\u003eMarine structures (above waterline)\u003c\/strong\u003e — jetties, pontoons, boat ramps, and coastal structures where long-term zinc protection is required\u003c\/li\u003e\n  \u003cli\u003e🛣️ \u003cstrong\u003eHighway \u0026amp; road infrastructure\u003c\/strong\u003e — guardrails, sign gantries, lighting columns, and road furniture\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eIndustrial plant — outdoor equipment\u003c\/strong\u003e — structural bolting on outdoor process equipment, tanks, and pipework supports\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: Why can’t I use standard nuts with HDG bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Hot dip galvanising deposits a thick zinc coating (45–85μm) on all surfaces including threads. This coating is too thick for standard metric nuts to engage correctly. After galvanising, the bolt threads are overcut (tapped oversize) to restore the thread profile — but this means the thread is now slightly larger than standard. HDG overcut nuts (also galvanised with overcut threads) must be used. Using standard nuts on HDG bolts will result in cross-threading, seizure, or incorrect torque readings.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How does hot dip galvanising compare to electroplated zinc for outdoor use?\u003c\/strong\u003e\u003cbr\u003e\nA: HDG provides dramatically better outdoor corrosion protection: 45–85μm zinc coating vs 5–8μm for electroplated zinc, giving 5–10× longer service life. HDG is the standard choice for structural steel in outdoor, coastal, and industrial environments. Electroplated zinc is suitable for general indoor\/mild outdoor use where long-term exposure is not a concern.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does hot dip galvanising affect the mechanical properties of Grade 8.8 bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: The galvanising process (450°C) can slightly affect the mechanical properties of high-strength fasteners. For Grade 8.8, the process temperature is below the tempering temperature of the steel, so mechanical properties are generally maintained. ISO 10684 specifies that HDG fasteners must be tested after galvanising to confirm compliance with the property class requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What lubricant should I use with HDG bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Use a zinc-compatible lubricant — wax-based lubricants, molybdenum disulfide (MoS₂) paste, or zinc-compatible anti-seize compounds are all suitable. Avoid copper-based anti-seize in contact with zinc coatings in wet environments (galvanic incompatibility). Always lubricate HDG threads before installation to achieve accurate torque control.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between DIN 931 and DIN 933 in HDG Grade 8.8?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 931 HDG Grade 8.8 is partially threaded — smooth shank beneath the head for shear load transfer. DIN 933 HDG Grade 8.8 is fully threaded. Choose DIN 931 for structural shear-critical connections; choose DIN 933 when maximum thread engagement or grip-length flexibility is needed.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/partially-threaded-hexagon-bolts-din-931-hot-dip-galvanised-high-tensile-steel-8-8.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}