{"title":"DIN 9021 Fender Washers (Large OD) — Low Carbon Steel, Hot Dip Galvanised (HDG)","description":"\u003ch1\u003eDIN 9021 Fender Washers (Large OD) — Low Carbon Steel, Hot Dip Galvanised (HDG)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 9021 Hot Dip Galvanised fender washers are manufactured from low carbon steel with a hot dip galvanised (HDG) zinc coating per ISO 10684. DIN 9021 specifies a large outer diameter washer — the outer diameter (d2) is approximately 3× the bolt nominal diameter — providing a significantly larger bearing area than standard DIN 125A washers to prevent pull-through and embedment in soft or thin materials such as timber, plywood, and composite panels.\u003c\/p\u003e\n\n\u003cp\u003eThe HDG coating (45–85 μm zinc per ISO 10684) provides the highest level of corrosion protection available for carbon steel washers — approximately 10× thicker than electroplated zinc — delivering 20–50+ years of outdoor corrosion protection. The metallurgically bonded zinc-iron alloy coating provides both barrier and cathodic (sacrificial) protection, making these washers the preferred choice for long-term outdoor structural timber, civil engineering, and infrastructure applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Due to the thick HDG coating (45–85 μm per side), HDG washers have slightly larger effective dimensions than nominal DIN 9021 values. Use HDG oversize nuts with HDG bolts and washers. Verify clearance fit before assembly.\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 9021 (dimensions)  |  ISO 10684 (HDG coating)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLarge outer diameter (fender \/ penny) washer — plain flat, no chamfer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow Carbon Steel (mild steel)\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) — per ISO 10684\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)\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≥ 1000 hours to red rust (typical for 45–85 μm HDG)\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 (environment-dependent, per ISO 14713)\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 – M24\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOD Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOuter diameter ≈ 3× nominal bolt diameter (vs ~2× for DIN 125A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Bolt Grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGrade 4.6, 4.8, 5.6, 6.8  |  HDG bolts (DIN 931 \/ DIN 933 HDG)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCorrosion Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eExcellent — best-in-class for carbon steel; 20–50+ year outdoor service life\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMagnetic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelated Standard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eISO 10684 (HDG fasteners)  |  ISO 14713 (zinc coating durability)  |  ISO 7093 (large washer)\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\u003eDimensions — DIN 9021 (Nominal, Pre-Galvanising)\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Nominal dimensions per DIN 9021 (pre-coating). HDG coating (45–85 μm per surface) adds approximately 0.09–0.17 mm to each radius — verify clearance fit before assembly.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eNominal Size (Bolt d)\u003c\/th\u003e\n      \u003cth\u003ed1 — Inner Ø (mm)\u003c\/th\u003e\n      \u003cth\u003ed2 — Outer Ø (mm)\u003c\/th\u003e\n      \u003cth\u003eh — Thickness (mm)\u003c\/th\u003e\n      \u003cth\u003eWeight (kg \/ 1000 pcs)\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\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.93\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e8.4\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e4.29\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e8.29\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e37\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e14.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e20.7\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e26.7\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e52.3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e25.0\u003c\/td\u003e\n\u003ctd\u003e72\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e75.1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* Nominal dimensions per DIN 9021 (pre-coating). HDG coating adds ~0.09–0.17 mm per radius. Weights are approximate based on low carbon steel density (7.85 g\/cm³) excluding zinc coating. HDG starts from M6 due to coating thickness constraints on smaller sizes.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDIN 9021 HDG vs DIN 125A HDG — Large OD vs Standard OD\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eDIN 9021 HDG (This Product)\u003c\/th\u003e\n      \u003cth\u003eDIN 125A HDG (Standard OD)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOuter diameter ratio\u003c\/td\u003e\n\u003ctd\u003e~3× bolt diameter\u003c\/td\u003e\n\u003ctd\u003e~2× bolt diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12 outer diameter\u003c\/td\u003e\n\u003ctd\u003e37 mm\u003c\/td\u003e\n\u003ctd\u003e24 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBearing area (M12)\u003c\/td\u003e\n\u003ctd\u003e~940 mm²\u003c\/td\u003e\n\u003ctd\u003e~320 mm² (~3× smaller)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePull-through resistance\u003c\/td\u003e\n\u003ctd\u003eHigh — for timber, plywood, soft materials\u003c\/td\u003e\n\u003ctd\u003eStandard — for hard structural materials\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc coating\u003c\/td\u003e\n\u003ctd\u003eHDG 45–85 μm (ISO 10684)\u003c\/td\u003e\n\u003ctd\u003eHDG 45–85 μm (ISO 10684)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor service life\u003c\/td\u003e\n\u003ctd\u003e20–50+ years\u003c\/td\u003e\n\u003ctd\u003e20–50+ years\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eTimber framing, decking, plywood, thin sheet — long-term outdoor\u003c\/td\u003e\n\u003ctd\u003eSteel, concrete structural — long-term outdoor\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHDG vs Zinc CR3 vs Stainless — Surface \u0026amp; Material Comparison for Outdoor Use\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eHDG Carbon Steel (This Product)\u003c\/th\u003e\n      \u003cth\u003eZinc CR3 Carbon Steel\u003c\/th\u003e\n      \u003cth\u003eA4 Stainless (SUS316)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc coating thickness\u003c\/td\u003e\n\u003ctd\u003e45 – 85 μm\u003c\/td\u003e\n\u003ctd\u003e5 – 8 μm\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive film)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt spray resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 1000 hours\u003c\/td\u003e\n\u003ctd\u003e≥ 240 hours\u003c\/td\u003e\n\u003ctd\u003eExcellent (no zinc)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor service life\u003c\/td\u003e\n\u003ctd\u003e20 – 50+ years\u003c\/td\u003e\n\u003ctd\u003e3 – 10 years\u003c\/td\u003e\n\u003ctd\u003e20–50+ years\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eACQ\/CCA treated timber\u003c\/td\u003e\n\u003ctd\u003eGood (HDG recommended)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003ctd\u003eA4 preferred\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMarine \/ high-chloride\u003c\/td\u003e\n\u003ctd\u003eGood (above waterline)\u003c\/td\u003e\n\u003ctd\u003eLimited\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCost\u003c\/td\u003e\n\u003ctd\u003eLow–medium\u003c\/td\u003e\n\u003ctd\u003eLow\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eLong-term outdoor structural timber, civil engineering\u003c\/td\u003e\n\u003ctd\u003eGeneral outdoor, short-medium term\u003c\/td\u003e\n\u003ctd\u003eMarine, coastal, treated timber\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\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\u003eLow Carbon Steel (mild steel, ≤ 0.25% C)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength\u003c\/td\u003e\n\u003ctd\u003e≥ 235 MPa (typical for low carbon steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e370 – 500 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eHot Dip Galvanised (HDG) per ISO 10684\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Coating Thickness\u003c\/td\u003e\n\u003ctd\u003e45 – 85 μm (per ISO 10684)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Purity\u003c\/td\u003e\n\u003ctd\u003e≥ 98.5% Zn (molten zinc bath)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating Bond\u003c\/td\u003e\n\u003ctd\u003eMetallurgical Zn-Fe alloy bond — cannot be peeled or chipped\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 1000 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 (per ISO 14713, environment-dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Limit\u003c\/td\u003e\n\u003ctd\u003eUp to +200°C (HDG service limit)\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    \u003ctr\u003e\n\u003ctd\u003eDensity (steel)\u003c\/td\u003e\n\u003ctd\u003e7.85 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🏗️ \u003cstrong\u003eStructural timber framing\u003c\/strong\u003e — large OD prevents bolt pull-through in timber framing, post-and-beam, and heavy timber construction; HDG provides 20–50+ year corrosion protection for outdoor structural timber\u003c\/li\u003e\n  \u003cli\u003e🏠 \u003cstrong\u003eDecking \u0026amp; outdoor timber\u003c\/strong\u003e — large OD distributes load across decking boards and outdoor timber structures; HDG resists weathering and moisture for long-term outdoor service\u003c\/li\u003e\n  \u003cli\u003e🛣️ \u003cstrong\u003eCivil \u0026amp; infrastructure engineering\u003c\/strong\u003e — guardrails, highway structures, sign gantries, transmission towers, and road furniture with large-OD washers for thin panel fastening\u003c\/li\u003e\n  \u003cli\u003e🌳 \u003cstrong\u003eAgricultural \u0026amp; rural structures\u003c\/strong\u003e — farm buildings, grain silos, fencing, and rural infrastructure in corrosive soil and weather environments requiring large bearing area\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003ePlywood \u0026amp; board materials\u003c\/strong\u003e — large OD prevents pull-through in plywood, OSB, and particle board structural connections; HDG for outdoor exposure\u003c\/li\u003e\n  \u003cli\u003e🍁 \u003cstrong\u003eOutdoor industrial plant\u003c\/strong\u003e — large OD for thin panel and cladding fastening in outdoor industrial facilities requiring long-term corrosion protection\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eCoastal structures (above waterline)\u003c\/strong\u003e — HDG provides good corrosion protection for above-waterline coastal timber and structural applications\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 the difference between DIN 9021 HDG and DIN 125A HDG?\u003c\/strong\u003e\u003cbr\u003e\nA: Both use the same HDG coating (45–85 μm, ISO 10684) and low carbon steel base material. The difference is the outer diameter: DIN 9021 has d2 ≈ 3× bolt diameter (e.g. M12: 37 mm) vs DIN 125A d2 ≈ 2× bolt diameter (e.g. M12: 24 mm) — approximately 3× greater bearing area. Choose DIN 9021 when fastening into timber, plywood, or thin materials where pull-through is a concern; choose DIN 125A for steel-to-steel or concrete structural connections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Should I use HDG or A4 stainless DIN 9021 washers for outdoor timber?\u003c\/strong\u003e\u003cbr\u003e\nA: Both are suitable for long-term outdoor timber applications. HDG carbon steel is the more cost-effective choice for general outdoor structural timber (20–50+ year service life). A4 stainless is preferred for: marine or coastal environments with high salt-air exposure; ACQ\/CCA treated timber (preservative chemicals can attack HDG zinc over time); and applications where the washer will be visible and appearance matters. Contact FULLERKREG if you need guidance on material selection for your specific application.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why does HDG start from M6 rather than M5?\u003c\/strong\u003e\u003cbr\u003e\nA: The thick HDG coating (45–85 μm per surface) significantly reduces the inner diameter clearance of small washers. For M5 washers, the coating thickness relative to the inner diameter is too large to maintain reliable clearance fit with the bolt shank after galvanising. HDG is therefore practical from M6 upwards for DIN 9021 washers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to use HDG nuts with HDG washers and bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. HDG bolts are supplied with oversize-tapped nuts to accommodate the zinc coating on the bolt threads. Standard nuts will not fit HDG bolts. For a complete HDG fastener assembly, specify HDG bolts, HDG oversize nuts, and HDG washers together.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the ISO equivalent of DIN 9021?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 9021 is equivalent to ISO 7093 (large washer series). Both specify a large outer diameter washer with d2 ≈ 3× bolt diameter. DIN 9021 is the German national standard; ISO 7093 is the international equivalent.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-9021-flat-fender-washer-hot-dipped-galvanized.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}