Home » Ribbed Safety Lock Washer S Series Regular Duty 65Mn Mechanically Zinc Plated

Ribbed Safety Lock Washer S Series Regular Duty 65Mn Mechanically Zinc Plated

Ribbed Safety Lock Washer S Series - Regular Duty | 65Mn Spring Steel | Mechanically Zinc Plated

FULLERKREG Ribbed Safety Lock Washers S Series (Regular Duty) in 65Mn Spring Steel with Mechanical Zinc Plating conform to DIN 9250 Type S. Mechanical zinc plating is a cold-process coating that applies zinc powder to the surface without heat or electrical current, eliminating hydrogen embrittlement risk - making it the preferred surface treatment for high-hardness spring steel washers (420-500 HV) where electroplating could cause delayed fracture.

Product Overview

  • Standard: DIN 9250 Type S (Schnorr-type ribbed safety lock washer, Regular Duty)
  • Series: S - Regular Duty
  • Material: 65Mn Spring Steel
  • Surface Treatment: Mechanically Zinc Plated
  • Thread Range: M1.6 - M30
  • Serration: Fine radial ribs on both top and bottom faces
  • Function: Anti-loosening, vibration resistance, elastic pre-load retention
  • Also known as: Schnorr washer, conical spring washer, Belleville lock washer, toothed conical washer

Dimensional Data - DIN 9250 Type S Regular Duty (65Mn Mechanically Zinc Plated)

All dimensions in mm. Data per DIN 9250 Type S standard.

Thread Size Inner Dia. d1 Outer Dia. d2 Thickness s Height h Min Height h Max
M1.6 1.7 3.2 0.3 0.5 0.6
M2 2.2 4 0.35 0.5 0.6
M2.5 2.7 4.8 0.45 0.6 0.8
M3 3.2 5.5 0.45 0.8 0.9
M3.5 3.7 6 0.45 0.8 0.9
M4 4.3 7 0.5 0.9 1.0
M5 5.3 9 0.6 1.0 1.1
M6 6.4 10 0.7 1.1 1.2
M6.35 6.7 9.5 0.7 1.1 1.2
M7 7.4 12 0.7 1.2 1.3
M8 8.4 13 0.8 1.3 1.4
M10 10.5 16 1.0 1.5 1.6
M11 11.6 15.5 1.0 1.5 1.6
M12 13 18 1.1 1.6 1.7
M12.7 13.7 19 1.1 1.7 1.8
M14 15 22 1.2 1.9 2.0
M16 17 24 1.3 2.0 2.1
M18 19 27 1.5 2.2 2.3
M20 21 30 1.5 2.3 2.4
M22 23 33 1.5 2.4 2.5
M24 25.6 36 1.8 2.6 2.7
M25.4 27 38 2.0 2.7 2.8
M27 28.6 39 2.0 2.8 2.9
M30 31.6 45 2.0 3.1 3.2

Note: Mechanical zinc plating thickness is typically 5-25 microns. Actual installed dimensions may vary slightly. Confirm with FULLERKREG technical team for tight-tolerance applications. For sizes M33 and above, contact FULLERKREG for availability.

Surface Treatment - Mechanical Zinc Plating Explained

Mechanical Zinc Plating (also known as mechanical galvanizing or peen plating) is a cold-process coating method that tumbles parts with zinc powder, glass beads, and chemical promoters to mechanically bond zinc to the steel surface. Unlike electroplating, no electrical current or heat is used.

Key advantages for high-hardness spring steel components:

  • 🛡️ No hydrogen embrittlement - cold process eliminates the hydrogen absorption risk associated with electroplating; critical for 65Mn spring steel at 420-500 HV
  • 🌐 Uniform coating - consistent zinc layer on all surfaces including recesses, threads, and serrations
  • 📐 Controlled thickness - typically 5-25 microns; predictable dimensional impact
  • 🛡️ Good corrosion resistance - zinc sacrificial protection; typically 96-200 hours NSS per ISO 9227 depending on passivation
  • ✅ RoHS compliant - available with Cr3 passivation (no hexavalent chromium)
  • 🏭 Suitable for bulk production - batch process ideal for high-volume fastener coating

Mechanical Zinc Plating vs Electroplating - Why It Matters for Spring Steel

Property Mechanical Zinc Plating (This Page) Electroplating (Zinc Cr3 / Yellow)
Process Cold mechanical tumbling Electrical current in acid bath
Hydrogen Embrittlement Risk None Present (requires baking relief)
Suitability for High-Hardness Steel Ideal (420-500 HV) Risk of delayed fracture
Coating Uniformity Excellent on all surfaces Good, may vary on recesses
Thickness Control 5-25 microns 5-12 microns
Corrosion Resistance Good (96-200h NSS) Good-Superior (120-200h NSS)
RoHS Compliant Yes (Cr3 passivation) Yes (Cr3) / No (Cr6 Yellow)

Material Grade Comparison

Property 65Mn Mech. Zinc (This Page) A2 Stainless A4 Stainless
Hardness 420-500 HV ~200-300 HV ~200-300 HV
Spring-back Force High Medium Medium
Pre-load Retention Excellent Good Good
Corrosion Resistance Good (zinc protected) Good (passivated) Excellent (passivated)
H2 Embrittlement Risk None (mech. process) N/A N/A
RoHS Compliant Yes Yes Yes

Selection Guide - S Series vs VS Series

Series Duty Wall Thickness Cone Height Spring Force Best For
S (this page) Regular Duty Standard Standard Medium-High General industrial, standard bolt loads
VS Heavy Duty Thicker Higher High Heavy machinery, high pre-load, severe vibration

How It Works

The S Series washer operates on two simultaneous locking mechanisms:

  • 🔩 Conical spring action - cone profile stores elastic energy under bolt load, pushing back to maintain clamp force as the bolt tends to loosen.
  • 🔒 Radial rib grip - fine ribs on both faces bite into mating surfaces, creating mechanical resistance to rotation in both directions.

Stack in the same direction to multiply spring force, or back-to-back to increase deflection range.

Standard and Compliance

DIN 9250 Type S (Regular Duty), cross-referenced with NFE 25-511 and Schnorr original specification. FULLERKREG washers are manufactured to full DIN 9250 Type S dimensional compliance. Certification available on request for bulk orders.

Material and Surface Specification

Property Specification
Material 65Mn Spring Steel
Hardness 420-500 HV
Surface Treatment Mechanically Zinc Plated
Plating Thickness 5-25 microns (typical)
Salt Spray Resistance 96-200 hours NSS (ISO 9227)
Hydrogen Embrittlement None (cold process)
Temperature Range -40 to +120 degrees C
RoHS Compliant Yes

Key Features

  • 🔩 High hardness 420-500 HV - superior spring-back force vs stainless steel
  • 🔒 Dual locking mechanism - conical spring + radial rib grip on both faces
  • 🛡️ No hydrogen embrittlement - cold mechanical process; safe for high-hardness spring steel
  • 🌐 Uniform zinc coating - consistent protection on all surfaces including serrations
  • 🔄 Reusable - retains locking strength if undamaged
  • 🔀 Stackable - same-direction for higher force; back-to-back for deflection
  • 🏭 Bulk supply ready - bags, boxes, custom packaging available

Typical Applications

  • Automotive chassis, suspension, and powertrain assemblies
  • Industrial machinery and heavy equipment subject to vibration
  • Construction steel structures and prefabricated buildings
  • Agricultural and off-highway equipment
  • Electrical cabinets and control panels
  • Rail and transportation equipment
  • High-strength bolted joints requiring hydrogen embrittlement-free coating

Product Gallery

Ribbed Safety Lock Washer S Series Regular Duty - 65Mn / Mechanically Zinc Plated

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Why Choose FULLERKREG?

🏆 Standard Compliance - Full DIN 9250 Type S conformance, NFE 25-511 cross-reference support
🔬 Material Traceability - 65Mn spring steel mill certificates and plating reports available on request
📦 Flexible MOQ - Small batch samples to full production quantities; custom packaging available
🌍 Global Shipping - Reliable export logistics to Europe, North America, Southeast Asia, and beyond
💬 Technical Support - Engineering team available for selection guidance and stacking calculations
⚙️ Broad Range - S and VS Series in A2, A4 stainless steel and 65Mn spring steel grades

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