NFE 25-511 Contact Washers

FULLERKREG NFE 25-511 Serrated Contact Conical Washers are cone-shaped spring washers with radial serrations on both bearing faces. The conical profile provides elastic pre-load retention while the serrations grip mating surfaces to prevent loosening under vibration and dynamic loads. Available in multiple materials and surface treatments to suit a wide range of industrial environments.

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NFE 25-511 M-Type Series

The M-Type (Type A) is designed for use with hex head screws and nuts, featuring the largest outer diameter in the NFE 25-511 range. Thread sizes M3–M12. Select your material and surface treatment below:

M-Type Serrated Contact Conical Washers (NFE 25511) — Stainless Steel A2
材质 A2 (SUS304 / 1.4301) · 表面钒化洗白 · M3–M12 · 耐腐蚀，适用于一般工业环境

M-Type Serrated Contact Conical Washers (NFE 25511) — Stainless Steel A4
材质 A4 (SUS316 / 1.4401) · 表面钒化洗白 · M3–M12 · 含锢，超强耐海水、化工腐蚀性能

NFE 25-511 M-Type Serrated Contact Conical Washers — 430–500 HV | Zinc Cr3
材质 65Mn 弹簧钉 · 硬度 430–500 HV · 表面 Zinc Cr3（三价铬锂电镀）· M3–M12 · RoHS合规，高硬度防松动

NFE 25-511 M-Type Serrated Contact Conical Washers — 430–500 HV | Zinc Yellow
材质 65Mn 弹簧钉 · 硬度 430–500 HV · 表面 Zinc Yellow（黄色锂电镀）· M3–M12 · 超强耐蚀（≥200h NSS）

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Selection Guide — Material & Surface Treatment

Grade	Material	Surface	Hardness	Salt Spray	RoHS	Best For
A2 Stainless	SUS304 / 1.4301	Passivated	~200–300 HV	—	✅	General industrial, indoor
A4 Stainless	SUS316 / 1.4401	Passivated	~200–300 HV	—	✅	Marine, chemical, coastal
65Mn Zinc Cr3	65Mn Spring Steel	Zinc Cr3	430–500 HV	≥120h	✅	High pre-load, RoHS supply chains
65Mn Zinc Yellow	65Mn Spring Steel	Zinc Yellow	430–500 HV	≥200h	⚠️ Cr6	Max corrosion protection, general industrial

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About NFE 25-511

NFE 25-511 is a French national standard specifying serrated contact conical washers (also known as Schnorr-type or toothed conical washers). The standard defines three types by fastener head geometry:

• Type M (A) — For hex head screws and nuts · Largest OD
• Type B — For cylindrical head screws (socket cap) · Medium OD
• Type C — For flat nuts and countersunk fasteners · Smallest OD

This series currently lists Type M variants. Type B and Type C variants are available — contact FULLERKREG for specifications and pricing.

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Product Gallery

NFE 25-511 Serrated Contact Conical Washers — FULLERKREG

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Why Choose FULLERKREG?

🏆 Standard Compliance — Full NFE 25-511 dimensional conformance, with DIN/ISO cross-reference support
🔬 Material Traceability — EN 10204 3.1 mill certificates and plating reports available on request
📦 Flexible MOQ — Small batch samples to full production reels; custom packaging available
🌍 Global Shipping — Reliable export logistics to Europe, North America, Southeast Asia, and beyond
💬 Technical Support — Engineering team available for selection guidance, substitution advice, and custom specifications
⚙️ Broad Range — Full NFE 25-511 type range (M / B / C) across multiple materials and surface treatments