{"title":"DIN 7349 Thick Flat Washer Steel Zinc CR3","description":"\u003ch1\u003eDIN 7349 Thick Flat Washer — Low Carbon Steel, Zinc CR3\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 7349 thick flat washers are manufactured to DIN 7349 standard in low carbon steel with a Zinc CR3 (trivalent chromium) electroplated finish. DIN 7349 washers are specifically designed for use with bolts that have heavy-type spring pins (DIN 7346 \/ ISO 8752), featuring a larger outer diameter and greater thickness than standard DIN 125 flat washers for superior load distribution and bearing surface. The Zinc CR3 finish delivers reliable corrosion protection with full RoHS compliance — the modern, environmentally safe alternative to hexavalent chromium coatings.\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 7349\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Low Carbon Steel (C ≤ 0.20%)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Zinc Electroplated, Trivalent Chromium Passivation (CR3 \/ Blue-White)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorrosion Resistance:\u003c\/strong\u003e ≥ 72 hours salt spray (neutral, NSS) per ISO 9227\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize Range:\u003c\/strong\u003e M5 – M24\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesigned for:\u003c\/strong\u003e Bolts with heavy-type spring pins (DIN 7346 \/ ISO 8752)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeature:\u003c\/strong\u003e Extra-large OD and increased thickness vs. DIN 125 — superior load distribution\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoHS \u0026amp; REACH Compliant\u003c\/strong\u003e — no hexavalent chromium (Cr6+)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Specifications — DIN 7349 Thick Flat Washers (Steel, Zinc CR3)\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Tolerances per DIN 7349.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eNominal Size (d)\u003c\/th\u003e\n      \u003cth\u003eInner Dia. d1\u003c\/th\u003e\n      \u003cth\u003eOuter Dia. d2\u003c\/th\u003e\n      \u003cth\u003eThickness h\u003c\/th\u003e\n      \u003cth\u003eWeight (g\/100 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\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e107\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\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e201\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\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e465\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\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e977\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\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e1,974\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\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e5,452\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\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e11,660\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\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e19,370\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003e* All dimensions conform to DIN 7349. Weight values based on steel density ≈7.85 g\/cm³. Please verify with your engineering team for critical applications.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties — Low Carbon Steel\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\u003c\/td\u003e\n\u003ctd\u003eLow Carbon Steel (C ≤ 0.20%)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness (HV)\u003c\/td\u003e\n\u003ctd\u003e100 – 200 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e≥ 300 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eZinc Electroplating + CR3 Trivalent Chromium Passivation\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating Thickness\u003c\/td\u003e\n\u003ctd\u003e5 – 12 μm (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 72 hours (ISO 9227 NSS)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40°C to +120°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS \/ REACH\u003c\/td\u003e\n\u003ctd\u003eCompliant — No hexavalent chromium (Cr6+)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eChemical Composition — Low Carbon Steel\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eElement\u003c\/th\u003e\n      \u003cth\u003eC\u003c\/th\u003e\n      \u003cth\u003eMn\u003c\/th\u003e\n      \u003cth\u003eP (max)\u003c\/th\u003e\n      \u003cth\u003eS (max)\u003c\/th\u003e\n      \u003cth\u003eSi\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eContent (%)\u003c\/td\u003e\n      \u003ctd\u003e≤ 0.20\u003c\/td\u003e\n      \u003ctd\u003e0.30 – 0.60\u003c\/td\u003e\n      \u003ctd\u003e0.045\u003c\/td\u003e\n      \u003ctd\u003e0.045\u003c\/td\u003e\n      \u003ctd\u003e≤ 0.35\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eSurface Treatment — Zinc CR3 Explained\u003c\/h2\u003e\n\u003cp\u003eCR3 (trivalent chromium) passivation is the modern, environmentally compliant alternative to traditional hexavalent chromium (CR6) coatings. FULLERKREG Zinc CR3 washers offer:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eRoHS \u0026amp; ELV compliant\u003c\/strong\u003e — no Cr6+ hazardous substances\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eBlue-white bright appearance\u003c\/strong\u003e — clean, professional finish\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e≥ 72 hours neutral salt spray\u003c\/strong\u003e resistance (ISO 9227)\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eUniform coating\u003c\/strong\u003e — consistent 5–12 μm thickness across all surfaces\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eSuitable for indoor and light outdoor applications\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eNo hydrogen embrittlement risk\u003c\/strong\u003e at standard hardness levels\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDIN 7349 vs. DIN 125 — Key Differences\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eFeature\u003c\/th\u003e\n      \u003cth\u003eDIN 7349\u003c\/th\u003e\n      \u003cth\u003eDIN 125\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eThick flat washer (heavy type)\u003c\/td\u003e\n\u003ctd\u003eStandard flat washer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003eLarger (extra-wide bearing surface)\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003eGreater (heavy duty)\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDesigned for\u003c\/td\u003e\n\u003ctd\u003eBolts with heavy spring pins (DIN 7346)\u003c\/td\u003e\n\u003ctd\u003eGeneral-purpose bolts \u0026amp; screws\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLoad Distribution\u003c\/td\u003e\n\u003ctd\u003eSuperior — wider bearing area\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeavy machinery, structural, high-vibration\u003c\/td\u003e\n\u003ctd\u003eGeneral assembly\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\u003eHeavy machinery \u0026amp; structural assemblies\u003c\/strong\u003e with bolts using heavy-type spring pins (DIN 7346)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustrial equipment\u003c\/strong\u003e requiring large bearing surface to prevent pull-through under high loads\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomotive manufacturing\u003c\/strong\u003e — body panels, chassis, and suspension assemblies\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction \u0026amp; steel structures\u003c\/strong\u003e — indoor and sheltered outdoor environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHVAC \u0026amp; mechanical systems\u003c\/strong\u003e — ductwork, equipment mounting, vibration-prone assemblies\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectronics enclosures \u0026amp; control panels\u003c\/strong\u003e — where RoHS compliance is mandatory\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeneral light industrial\u003c\/strong\u003e — wherever a heavy-type washer with corrosion protection is required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Photo Gallery\u003c\/h2\u003e\n\u003cp\u003eReal product images — FULLERKREG DIN 7349 Thick Flat Washer, Steel Zinc CR3:\u003c\/p\u003e\n\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\u003ePackaging \u0026amp; Supply\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSize\u003c\/th\u003e\n      \u003cth\u003eStandard Pack (pcs)\u003c\/th\u003e\n      \u003cth\u003eBulk Carton (pcs)\u003c\/th\u003e\n      \u003cth\u003eWeight per 100 pcs (approx.)\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\u003e100\u003c\/td\u003e\n\u003ctd\u003e5,000\u003c\/td\u003e\n\u003ctd\u003e~107 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e3,000\u003c\/td\u003e\n\u003ctd\u003e~201 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2,000\u003c\/td\u003e\n\u003ctd\u003e~465 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e1,000\u003c\/td\u003e\n\u003ctd\u003e~977 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e500\u003c\/td\u003e\n\u003ctd\u003e~1,974 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e~5,452 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e~11,660 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e~19,370 g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eCustom packaging and labeling available for OEM \/ wholesale orders. Contact FULLERKREG for bulk pricing.\u003c\/em\u003e\u003c\/p\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 critical dimensions\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, RoHS declarations, test reports available\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: What is DIN 7349 and how does it differ from DIN 125?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 7349 is a thick flat washer standard designed for bolts with heavy-type spring pins (DIN 7346). Compared to DIN 125, DIN 7349 washers have a larger outer diameter and greater thickness, providing a wider bearing surface and better load distribution in heavy-duty applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is Zinc CR3 and why is it preferred over traditional zinc plating?\u003c\/strong\u003e\u003cbr\u003e\nA: Zinc CR3 uses trivalent chromium (Cr3+) passivation instead of the traditional hexavalent chromium (Cr6+). It is fully RoHS and ELV compliant, provides equivalent or better corrosion protection (≥72h salt spray), and eliminates the environmental and health risks associated with Cr6+ coatings.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is Zinc CR3 suitable for outdoor use?\u003c\/strong\u003e\u003cbr\u003e\nA: Zinc CR3 is suitable for indoor and light outdoor (sheltered) environments. For prolonged outdoor exposure, coastal, or high-humidity environments, stainless steel grades (A2 or A4) are recommended.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Are these washers RoHS compliant?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. FULLERKREG Zinc CR3 washers use trivalent chromium passivation only — no hexavalent chromium (Cr6+). Full RoHS and REACH compliance documentation is available upon request.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I order mixed sizes in one shipment?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. FULLERKREG supports mixed-size wholesale orders. Please contact us with your size breakdown and quantities for a custom quotation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do you provide material test certificates?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. Mill certificates, dimensional inspection reports, and surface treatment test reports are available for all orders 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-7349-thick-flat-washer-steel-zinc-cr3.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}