{"title":"M-Type Serrated Contact Conical Washers (NFE 25511) - Stainless Steel (A4)","description":"\u003ch1\u003eM-Type Serrated Contact Conical Washers — NFE 25-511 | Stainless Steel A4 (SUS316)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG M-Type Serrated Contact Conical Washers in \u003cstrong\u003eA4 Stainless Steel (SUS316 \/ 1.4401)\u003c\/strong\u003e conform to the French standard \u003cstrong\u003eNFE 25-511\u003c\/strong\u003e. The conical (Belleville-style) profile combined with radial serrations on both faces delivers superior vibration resistance and reliable pre-load retention — ideal for marine, chemical, and high-corrosion environments where A2 grade is insufficient.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\n\u003cp\u003eNFE 25-511 defines three washer types for different fastener head geometries. This listing covers \u003cstrong\u003eType M (M-Type)\u003c\/strong\u003e — designed for use with \u003cstrong\u003ehex head screws and nuts\u003c\/strong\u003e. The M-Type features a larger outer diameter and is the most widely specified variant for general structural and industrial applications.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e NFE 25-511 (French national standard, equivalent function to DIN 6796 \/ ISO 10673 serrated conical washers)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e M — For Hex Screws and Nuts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e A4 Stainless Steel (SUS316 \/ 1.4401)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Passivated \u0026amp; Whitened (Passivation)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Range:\u003c\/strong\u003e M3 – M12\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Anti-loosening, vibration damping, pre-load maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Data — NFE 25-511 Type M (Stainless Steel A4)\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in \u003cstrong\u003emm\u003c\/strong\u003e. Data verified against NFE 25-511 standard catalogue.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread Size\u003c\/th\u003e\n      \u003cth\u003eInner Dia. d1 (Min)\u003c\/th\u003e\n      \u003cth\u003eOuter Dia. d2 (Min)\u003c\/th\u003e\n      \u003cth\u003eOuter Dia. d2 (Max)\u003c\/th\u003e\n      \u003cth\u003eHeight h (Min)\u003c\/th\u003e\n      \u003cth\u003eHeight h (Max)\u003c\/th\u003e\n      \u003cth\u003eThickness s (Min)\u003c\/th\u003e\n      \u003cth\u003eThickness s (Max)\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\u003e6.35\u003c\/td\u003e\n\u003ctd\u003e7.25\u003c\/td\u003e\n\u003ctd\u003e0.80\u003c\/td\u003e\n\u003ctd\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e0.37\u003c\/td\u003e\n\u003ctd\u003e0.43\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\u003e8.55\u003c\/td\u003e\n\u003ctd\u003e9.55\u003c\/td\u003e\n\u003ctd\u003e1.00\u003c\/td\u003e\n\u003ctd\u003e1.20\u003c\/td\u003e\n\u003ctd\u003e0.47\u003c\/td\u003e\n\u003ctd\u003e0.53\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\u003e10.45\u003c\/td\u003e\n\u003ctd\u003e11.45\u003c\/td\u003e\n\u003ctd\u003e1.15\u003c\/td\u003e\n\u003ctd\u003e1.35\u003c\/td\u003e\n\u003ctd\u003e0.57\u003c\/td\u003e\n\u003ctd\u003e0.63\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\u003e12.61\u003c\/td\u003e\n\u003ctd\u003e13.61\u003c\/td\u003e\n\u003ctd\u003e1.30\u003c\/td\u003e\n\u003ctd\u003e1.50\u003c\/td\u003e\n\u003ctd\u003e0.67\u003c\/td\u003e\n\u003ctd\u003e0.73\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\u003e16.54\u003c\/td\u003e\n\u003ctd\u003e18.54\u003c\/td\u003e\n\u003ctd\u003e1.65\u003c\/td\u003e\n\u003ctd\u003e1.95\u003c\/td\u003e\n\u003ctd\u003e0.87\u003c\/td\u003e\n\u003ctd\u003e0.97\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\u003e20.58\u003c\/td\u003e\n\u003ctd\u003e22.58\u003c\/td\u003e\n\u003ctd\u003e2.00\u003c\/td\u003e\n\u003ctd\u003e2.40\u003c\/td\u003e\n\u003ctd\u003e1.07\u003c\/td\u003e\n\u003ctd\u003e1.23\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\u003e24.58\u003c\/td\u003e\n\u003ctd\u003e26.58\u003c\/td\u003e\n\u003ctd\u003e2.20\u003c\/td\u003e\n\u003ctd\u003e2.60\u003c\/td\u003e\n\u003ctd\u003e1.27\u003c\/td\u003e\n\u003ctd\u003e1.43\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eNote: All A4 Stainless Steel fasteners may exhibit slight magnetic properties due to the manufacturing process. Refer to ISO 3506-2 Annex I.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eSelection Guide — NFE 25-511 Type Comparison\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eType\u003c\/th\u003e\n      \u003cth\u003eDesigned For\u003c\/th\u003e\n      \u003cth\u003eFastener Head Style\u003c\/th\u003e\n      \u003cth\u003eRelative Outer Diameter\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eType M (this page)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eHex screws \u0026amp; nuts\u003c\/td\u003e\n      \u003ctd\u003eHexagonal head \/ nut bearing face\u003c\/td\u003e\n      \u003ctd\u003eLargest OD\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eType B\u003c\/td\u003e\n      \u003ctd\u003eCylindrical head screws\u003c\/td\u003e\n      \u003ctd\u003eSocket cap head (ISO 4762 \/ DIN 912 style)\u003c\/td\u003e\n      \u003ctd\u003eMedium OD\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eType C\u003c\/td\u003e\n      \u003ctd\u003eFlat nuts \u0026amp; countersunk fasteners\u003c\/td\u003e\n      \u003ctd\u003eCountersunk \/ flat bearing surface\u003c\/td\u003e\n      \u003ctd\u003eSmallest OD\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eA4 vs A2 — Which Grade Should You Choose?\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eA2 (SUS304)\u003c\/th\u003e\n      \u003cth\u003eA4 (SUS316) — This Page\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBase Alloy\u003c\/td\u003e\n\u003ctd\u003e18% Cr, 8% Ni\u003c\/td\u003e\n\u003ctd\u003e16% Cr, 10% Ni, 2% Mo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMolybdenum Content\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003e2–3% — key for chloride resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eGood — indoor \/ mild outdoor\u003c\/td\u003e\n\u003ctd\u003eExcellent — marine, chemical, coastal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChloride Resistance\u003c\/td\u003e\n\u003ctd\u003eLimited\u003c\/td\u003e\n\u003ctd\u003eSuperior (pitting \u0026amp; crevice corrosion)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRecommended Environment\u003c\/td\u003e\n\u003ctd\u003eGeneral industrial\u003c\/td\u003e\n\u003ctd\u003eMarine, food processing, chemical plant\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003ePremium\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eStandard \u0026amp; Compliance\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eNFE 25-511\u003c\/strong\u003e standard is a French national standardisation specification governing serrated contact conical (Schnorr-type) washers. While largely superseded in new designs by DIN 6796 and ISO 10673, NFE 25-511 remains widely specified in:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFrench OEM and industrial legacy assemblies\u003c\/li\u003e\n  \u003cli\u003eAerospace and defence sub-assemblies requiring French certification\u003c\/li\u003e\n  \u003cli\u003eElectrical panel and switchgear applications in corrosive environments\u003c\/li\u003e\n  \u003cli\u003eMarine and offshore equipment\u003c\/li\u003e\n  \u003cli\u003eFood processing and pharmaceutical machinery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFULLERKREG washers are manufactured to full NFE 25-511 dimensional and mechanical compliance. Material certification (EN 10204 3.1) available on request for bulk orders.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Surface Specification\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial Grade\u003c\/td\u003e\n\u003ctd\u003eA4 Stainless Steel (SUS316 \/ 1.4401)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003ePassivated \u0026amp; Whitened\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — suitable for marine, coastal, and chemical environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic Properties\u003c\/td\u003e\n\u003ctd\u003eSlightly magnetic after cold forming (per ISO 3506-2 Annex I)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-196°C to +300°C (continuous service)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS Compliant\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\u003eKey Features \u0026amp; Technical Advantages\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e🔩 \u003cstrong\u003eConical spring action\u003c\/strong\u003e — maintains clamp load under thermal cycling and dynamic loads\u003c\/li\u003e\n  \u003cli\u003e🔒 \u003cstrong\u003eRadial serrations on both faces\u003c\/strong\u003e — bite into mating surfaces to resist rotation and self-loosening\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003eElectrical conductivity\u003c\/strong\u003e — serrations penetrate oxide layers for reliable grounding connections\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eSuperior corrosion resistance\u003c\/strong\u003e — A4 \/ SUS316 with molybdenum for marine and chemical environments\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003ePrecision manufactured\u003c\/strong\u003e — tight dimensional tolerances per NFE 25-511\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eBulk supply ready\u003c\/strong\u003e — available in full reels, bags, and custom packaging for production lines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMarine and offshore structures, deck fittings, and hull assemblies\u003c\/li\u003e\n  \u003cli\u003eCoastal and waterfront construction\u003c\/li\u003e\n  \u003cli\u003eFood processing equipment and pharmaceutical machinery\u003c\/li\u003e\n  \u003cli\u003eChemical plant pipework and pressure vessels\u003c\/li\u003e\n  \u003cli\u003eSwimming pool and water treatment installations\u003c\/li\u003e\n  \u003cli\u003eElectrical cabinets in humid or corrosive environments\u003c\/li\u003e\n  \u003cli\u003eAutomotive and rail equipment in salt-spray zones\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003cp\u003eM-Type NFE 25-511 Serrated Conical Washers — A4 Stainless Steel\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[ Image 1 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[ Image 2 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[ Image 3 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[ Image 4 ]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG?\u003c\/h2\u003e\n\n\u003cp\u003e\n  🏆 \u003cstrong\u003eStandard Compliance\u003c\/strong\u003e — Full NFE 25-511 dimensional conformance, with DIN\/ISO cross-reference support\u003cbr\u003e\n  🔬 \u003cstrong\u003eMaterial Traceability\u003c\/strong\u003e — EN 10204 3.1 mill certificates available for A4 grade\u003cbr\u003e\n  📦 \u003cstrong\u003eFlexible MOQ\u003c\/strong\u003e — Small batch samples to full production reels; custom packaging available\u003cbr\u003e\n  🌍 \u003cstrong\u003eGlobal Shipping\u003c\/strong\u003e — Reliable export logistics to Europe, North America, Southeast Asia, and beyond\u003cbr\u003e\n  💬 \u003cstrong\u003eTechnical Support\u003c\/strong\u003e — Engineering team available for selection guidance, substitution advice, and custom specifications\u003cbr\u003e\n  ⚙️ \u003cstrong\u003eBroad Range\u003c\/strong\u003e — Complementary washer types (Type B, Type C) and related DIN\/ISO standards stocked\n\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/m-type-serrated-contact-conical-washers-nfe-25511-stainless-steel-a4.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}