{"title":"DIN 9021 Fender Washers (Large OD) — A2 Stainless Steel (SUS304), Whitened \u0026 Passivated","description":"\u003ch1\u003eDIN 9021 Fender Washers (Large OD) — A2 Stainless Steel (SUS304)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 9021 fender washers are manufactured from A2 stainless steel (SUS304) with a whitened and passivated surface finish. DIN 9021 specifies a large outer diameter washer — the outer diameter (d2) is approximately 3× the bolt nominal diameter, compared to approximately 2× for standard DIN 125A washers. This significantly larger bearing area distributes the bolt clamping load over a much greater surface, preventing pull-through and embedment in soft or thin materials such as wood, plastic, plywood, thin sheet metal, and composite panels.\u003c\/p\u003e\n\n\u003cp\u003eThe A2 (SUS304) material provides excellent corrosion resistance for outdoor, food-grade, and mildly corrosive environments, making these large-OD washers the preferred choice for timber construction, cladding, roofing, and outdoor structural applications where both large bearing area and corrosion resistance are required.\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 (Large OD flat washer, outer diameter ≈ 3× bolt diameter)\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\u003eA2 Stainless Steel \/ SUS304 \/ 1.4301\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM5 – 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\u003eHardness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤ 200 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCorrosion Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood — suitable for outdoor, timber, and mild corrosive environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMagnetic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSlightly magnetic after cold working\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecommended Pairing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA2 stainless bolts (DIN 931 \/ DIN 933) and nuts (DIN 934) for full material compatibility\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 125A (standard OD washer)  |  ISO 7093 (large washer series)\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\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Data per DIN 9021 standard, verified against reference data.\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\u003eM5\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e0.72\u003c\/td\u003e\n\u003c\/tr\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\u003e1.96\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\u003e4.35\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\u003e8.40\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\u003e15.0\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\u003e21.0\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\u003e27.0\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\u003e53.0\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\u003e76.0\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* d1 = inner diameter (clearance hole); d2 = outer diameter; h = nominal thickness. All dimensions per DIN 9021. Weights are approximate based on A2 stainless steel density (7.93 g\/cm³).\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDIN 9021 vs DIN 125A — Why Choose a Large OD Washer?\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eDIN 9021 (This Product)\u003c\/th\u003e\n      \u003cth\u003eDIN 125A (Standard)\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\u003eM10 outer diameter\u003c\/td\u003e\n\u003ctd\u003e30 mm\u003c\/td\u003e\n\u003ctd\u003e20 mm\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\u003eContact pressure (same load)\u003c\/td\u003e\n\u003ctd\u003e~3× lower\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePull-through resistance\u003c\/td\u003e\n\u003ctd\u003eHigh — suitable for soft materials\u003c\/td\u003e\n\u003ctd\u003eStandard — for hard materials\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eWood, plastic, plywood, thin sheet, composite panels\u003c\/td\u003e\n\u003ctd\u003eSteel, concrete, hard structural materials\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eISO equivalent\u003c\/td\u003e\n\u003ctd\u003eISO 7093\u003c\/td\u003e\n\u003ctd\u003eISO 7089\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Surface 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\u003eMaterial Designation\u003c\/td\u003e\n\u003ctd\u003eA2 \/ SUS304 \/ 1.4301 \/ 0Cr18Ni9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChromium Content\u003c\/td\u003e\n\u003ctd\u003e17.5 – 19.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNickel Content\u003c\/td\u003e\n\u003ctd\u003e8.0 – 10.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e≥ 500 MPa (annealed)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e≤ 200 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eGood — suitable for outdoor, timber, food-grade, and mild chemical environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e−50°C to +300°C (continuous service)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eSlightly magnetic after cold working (stamping process)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003e7.93 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\u003eTimber \u0026amp; wood construction\u003c\/strong\u003e — large bearing area prevents bolt head pull-through in timber framing, decking, fencing, and wood structural connections\u003c\/li\u003e\n  \u003cli\u003e🏠 \u003cstrong\u003eRoofing \u0026amp; cladding\u003c\/strong\u003e — distributes clamping load across thin metal sheet, corrugated roofing, and cladding panels to prevent deformation and pull-through\u003c\/li\u003e\n  \u003cli\u003e🧱 \u003cstrong\u003ePlastic \u0026amp; composite panels\u003c\/strong\u003e — large OD prevents embedment and pull-through in GRP, polycarbonate, and composite panel fastening\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003ePlywood \u0026amp; board materials\u003c\/strong\u003e — distributes load in plywood, OSB, MDF, and particle board connections where standard washers would embed\u003c\/li\u003e\n  \u003cli\u003e🌳 \u003cstrong\u003eOutdoor \u0026amp; garden structures\u003c\/strong\u003e — A2 stainless provides corrosion resistance for pergolas, garden furniture, fencing, and outdoor timber structures\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eSheet metal fabrication\u003c\/strong\u003e — large OD distributes load across thin sheet metal to prevent deformation at the fastening point\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eMarine \u0026amp; coastal timber\u003c\/strong\u003e — A2 stainless suitable for above-waterline marine timber structures and coastal outdoor 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 and DIN 125A?\u003c\/strong\u003e\u003cbr\u003e\nA: The key difference is the outer diameter. DIN 9021 specifies an outer diameter of approximately 3× the bolt nominal diameter, while DIN 125A specifies approximately 2×. For example, for M12: DIN 9021 has d2 = 37 mm vs DIN 125A d2 = 24 mm — giving approximately 3× greater bearing area. DIN 9021 is used where the larger bearing area is needed to prevent pull-through or embedment in soft materials. Both have the same inner diameter for the same bolt size.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What materials are DIN 9021 fender washers suitable for?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 9021 large OD washers are specifically designed for use with soft or thin materials where a standard DIN 125A washer would embed or pull through — including timber, plywood, OSB, MDF, plastic, GRP, polycarbonate, thin sheet metal, and composite panels. For hard materials (steel, concrete), standard DIN 125A washers are normally sufficient.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Are A2 stainless DIN 9021 washers suitable for outdoor timber use?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. A2 (SUS304) stainless steel provides good corrosion resistance for outdoor timber applications, including decking, fencing, pergolas, and garden structures. For coastal or marine-adjacent environments with high salt air exposure, A4 (SUS316) stainless washers provide superior corrosion resistance. Contact FULLERKREG for A4 DIN 9021 washer availability.\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\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use DIN 9021 washers with high-strength bolts (Grade 8.8 \/ 10.9)?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 9021 A2 stainless washers have a hardness of ≤ 200 HV, which is the normal (soft) washer grade. For Grade 8.8 bolts in non-critical applications, this may be acceptable. For Grade 10.9 or 12.9 bolts, or for structural applications requiring accurate preload, hardened washers (300 HV minimum) should be specified. Note that DIN 9021 hardened washers are less commonly available — contact FULLERKREG for availability.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-9021-fender-washer-a2-stainless.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}