{"title":"DIN 125A \/ ISO 7089 \/ GB\/T 97.1 Flat Washers — A2 Stainless Steel (SUS304)","description":"\u003ch1\u003eDIN 125A \/ ISO 7089 \/ GB\/T 97.1 Flat Washers — A2 Stainless Steel (SUS304)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 125A flat washers are manufactured from A2 stainless steel (SUS304) with a whitened and passivated surface finish. Conforming to DIN 125A, ISO 7089, and GB\/T 97.1, these washers distribute bolt and nut bearing loads over a larger surface area, protect the joint surface from damage during tightening, and provide a clean, corrosion-resistant bearing face for structural, mechanical, and general fastening applications.\u003c\/p\u003e\n\n\u003cp\u003eThe A2 (SUS304) material provides excellent corrosion resistance for outdoor, food-grade, and mildly corrosive environments, making these washers the standard choice for use with A2 stainless steel bolts and nuts (DIN 931 \/ DIN 933 \/ DIN 934).\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 125A ≡ ISO 7089 ≡ GB\/T 97.1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlain flat washer — normal series (Form A), chamfer on one side of inner hole\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\u003eM3 – M36\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 (per ISO 7089)\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, food-grade, 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 (stamping)\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\u003eISO 7089  |  GB\/T 97.1  |  DIN 125B (ISO 7090, double chamfer variant)\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 125A \/ ISO 7089 \/ GB\/T 97.1\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Data per DIN 125A \/ ISO 7089 standard. Verified against standard 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\u003eM3\u003c\/td\u003e\n\u003ctd\u003e3.2\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.07\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e0.19\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e0.29\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\u003e12\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e0.72\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\u003e16\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.28\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\u003e20\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.50\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\u003e24\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5.00\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\u003e28\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e6.80\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\u003e30\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e9.50\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM18\u003c\/td\u003e\n\u003ctd\u003e19.0\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e12.5\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\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\u003eM22\u003c\/td\u003e\n\u003ctd\u003e23.0\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e16.5\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\u003e44\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e29.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e28.0\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e38.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e31.0\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e48.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM33\u003c\/td\u003e\n\u003ctd\u003e34.0\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e68.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e37.0\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e88.0\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 125A \/ ISO 7089. 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 125A vs DIN 125B — Key Differences\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eFeature\u003c\/th\u003e\n      \u003cth\u003eDIN 125A (This Product)\u003c\/th\u003e\n      \u003cth\u003eDIN 125B\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInner hole chamfer\u003c\/td\u003e\n\u003ctd\u003eChamfer on one side only\u003c\/td\u003e\n\u003ctd\u003eChamfer on both sides (double chamfer)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eISO equivalent\u003c\/td\u003e\n\u003ctd\u003eISO 7089\u003c\/td\u003e\n\u003ctd\u003eISO 7090\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions (d1, d2, h)\u003c\/td\u003e\n\u003ctd\u003eIdentical to DIN 125B\u003c\/td\u003e\n\u003ctd\u003eIdentical to DIN 125A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical use\u003c\/td\u003e\n\u003ctd\u003eGeneral fastening — most common type worldwide\u003c\/td\u003e\n\u003ctd\u003eApplications requiring chamfer on both bearing faces\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStock availability\u003c\/td\u003e\n\u003ctd\u003eStandard stock item\u003c\/td\u003e\n\u003ctd\u003eLess common\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 (per ISO 7089)\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, 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    \u003ctr\u003e\n\u003ctd\u003eManufacturing Process\u003c\/td\u003e\n\u003ctd\u003eCold stamped from A2 stainless steel strip\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 steel connections\u003c\/strong\u003e — load distribution under bolt heads and nuts in structural joints, preventing embedment into the connected material\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eMarine \u0026amp; coastal structures\u003c\/strong\u003e — A2 stainless provides good corrosion resistance for outdoor and marine-adjacent applications above the waterline\u003c\/li\u003e\n  \u003cli\u003e🍼 \u003cstrong\u003eFood \u0026amp; beverage equipment\u003c\/strong\u003e — whitened and passivated surface suitable for food processing, beverage, and pharmaceutical equipment\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eFlanged pipe joints\u003c\/strong\u003e — bearing face protection and load distribution in flanged connections\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eIndustrial plant \u0026amp; machinery\u003c\/strong\u003e — general fastening in corrosive or hygienic environments where carbon steel would corrode\u003c\/li\u003e\n  \u003cli\u003e🏠 \u003cstrong\u003eConstruction \u0026amp; architectural\u003c\/strong\u003e — visible fastening applications where appearance and corrosion resistance are both required\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003eElectrical \u0026amp; instrumentation\u003c\/strong\u003e — non-magnetic (low magnetic permeability) applications in sensitive equipment\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 125A and ISO 7089?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 125A and ISO 7089 are equivalent standards specifying the same flat washer geometry and dimensions. DIN 125A is the German national standard; ISO 7089 is the international equivalent. GB\/T 97.1 is the Chinese national standard with the same dimensions. FULLERKREG washers conform to all three standards.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What bolt sizes do these washers fit?\u003c\/strong\u003e\u003cbr\u003e\nA: Each washer is sized by nominal bolt diameter. The inner diameter (d1) is slightly larger than the bolt shank to provide a clearance fit. For example, an M10 washer has d1 = 10.5 mm (clearance for M10 bolt shank, nominal 10 mm) and d2 = 20 mm outer diameter. Always match the washer nominal size to the bolt nominal size.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Should I use washers under both the bolt head and the nut?\u003c\/strong\u003e\u003cbr\u003e\nA: For most structural and mechanical applications, washers should be used under both the bolt head and the nut to distribute clamping load evenly and protect both joint surfaces from damage during tightening. For non-critical applications, a washer under the rotating element (usually the nut) is the minimum recommendation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Are A2 stainless washers suitable for outdoor use?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. A2 (SUS304) stainless steel provides good corrosion resistance for general outdoor, coastal, and mildly corrosive environments. For marine, offshore, or high-chloride environments where superior pitting and crevice corrosion resistance is required, specify A4 (SUS316) stainless washers instead.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use A2 stainless washers with carbon steel bolts?\u003c\/strong\u003e\u003cbr\u003e\nA: A2 stainless washers can be used with carbon steel bolts in dry or non-corrosive environments. However, in wet or corrosive environments, the galvanic potential difference between stainless steel and carbon steel can accelerate corrosion of the carbon steel. For best results and full corrosion protection, use matching A2 stainless bolts, nuts, and washers throughout the fastener assembly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why are A2 stainless washers slightly magnetic?\u003c\/strong\u003e\u003cbr\u003e\nA: A2 (SUS304) stainless steel is an austenitic grade that is non-magnetic in its annealed state. However, the cold stamping process used to manufacture washers induces a small amount of strain-induced martensite, making the finished washers slightly magnetic. This is normal and does not affect corrosion resistance or mechanical performance.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-125a-iso-7089-gb-t-97-1-flat-washer-a2-stainless.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}