Home » Ribbed Safety Lock Washer VS Series Heavy Duty 65Mn Mechanically Zinc Plated

Ribbed Safety Lock Washer VS Series Heavy Duty 65Mn Mechanically Zinc Plated

Ribbed Safety Lock Washer VS Series - Heavy Duty | 65Mn Spring Steel | Mechanically Zinc Plated (Zinc Cr3)

FULLERKREG Ribbed Safety Lock Washers VS Series (Heavy Duty) in 65Mn Spring Steel with Mechanical Zinc Plating (Zinc Cr3) conform to DIN 9250 Type VS. This combination delivers the highest spring force in the DIN 9250 range - the VS Heavy Duty profile provides maximum pre-load retention, while 65Mn spring steel (420-500 HV) offers superior hardness and spring-back force. Mechanical zinc plating eliminates hydrogen embrittlement risk, making it the technically correct surface treatment for high-hardness spring steel components.

Product Overview

  • Standard: DIN 9250 Type VS (Schnorr-type ribbed safety lock washer, Heavy Duty)
  • Series: VS - Heavy Duty (increased wall thickness and cone height vs S Series)
  • Material: 65Mn Spring Steel
  • Hardness: 420-500 HV
  • Surface Treatment: Mechanically Zinc Plated (Zinc Cr3 passivation)
  • Thread Range: M5 - M30
  • Serration: Fine radial ribs on both top and bottom faces
  • Function: Anti-loosening, maximum vibration resistance, high pre-load retention
  • Also known as: Schnorr VS washer, heavy duty conical lock washer, heavy duty Belleville lock washer

Dimensional Data - DIN 9250 Type VS Heavy Duty (65Mn Mechanically Zinc Plated)

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

Thread Size Inner Dia. d1 Outer Dia. d2 Thickness s Height h Min Height h Max
M5 5.3 9 1 1.2 1.4
M6 6.4 10 1 1.4 1.6
M7 7.4 12 1.2 1.7 2.0
M8 8.4 13 1.2 1.7 2.0
M10 10.5 16 1.5 2.0 2.4
M12 13 18 1.5 2.1 2.4
M14 15 22 2.0 2.7 3.1
M16 17 24 2.0 2.6 3.0
M18 19 27 2.5 3.2 3.7
M20 21 30 2.5 3.3 3.8
M22 23 33 2.5 3.4 3.9
M24 25.6 36 3.0 3.9 4.5
M27 28.6 39 3.0 4.0 4.6
M30 31.6 45 3.5 4.5 5.2

Note: Mechanical zinc plating thickness 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.

Why Mechanical Zinc Plating for High-Hardness Spring Steel

At 420-500 HV, 65Mn spring steel is highly susceptible to hydrogen embrittlement - a risk introduced by conventional electroplating processes (acid pickling + electrical current). Mechanical zinc plating eliminates this risk entirely:

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 65Mn (420-500 HV) Ideal Risk of delayed fracture
Coating Uniformity Excellent on all surfaces Good, may vary on recesses
Plating Thickness 5-25 microns 5-12 microns
Salt Spray Resistance 96-200 hours NSS (ISO 9227) 120-200 hours NSS
RoHS Compliant Yes (Cr3 passivation) Yes (Cr3) / No (Cr6 Yellow)

VS Series vs S Series - Key Differences

Property VS Series - Heavy Duty (This Page) S Series - Regular Duty
Wall Thickness s Thicker (1.0-3.5 mm) Standard (0.3-2.0 mm)
Cone Height h Greater Standard
Spring Force High Medium
Pre-load Retention Maximum Good
Thread Range M5 - M30 M1.6 - M30
Best For Heavy machinery, high-torque joints, severe vibration General industrial, standard bolt loads

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

How It Works - Schnorr Ribbed Safety Lock Washer

The VS Series washer operates on two simultaneous locking mechanisms:

  • 🔩 Conical spring action - the increased cone height stores greater elastic energy under bolt load. As the bolt tends to loosen, the washer pushes back with higher force, maintaining clamp load even under severe vibration and thermal cycling.
  • 🔒 Radial rib grip - fine ribs on both faces bite into the bolt head/nut bearing surface and the joint surface, creating strong mechanical resistance to rotation in both directions.

Washers can be stacked in the same direction to multiply spring force, or back-to-back to increase deflection range while maintaining locking grip.

Standard and Compliance

DIN 9250 Type VS (Heavy Duty), cross-referenced with NFE 25-511 and Schnorr original specification. FULLERKREG washers are manufactured to full DIN 9250 Type VS 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 (Zinc Cr3 passivation)
Plating Thickness 5-25 microns (typical)
Salt Spray Resistance 96-200 hours NSS (ISO 9227)
Hydrogen Embrittlement None (cold mechanical process)
Temperature Range -40 to +120 degrees C (continuous service)
RoHS Compliant Yes (Cr3 passivation, no hexavalent chromium)

Key Features and Technical Advantages

  • 🔩 Maximum spring force - VS Heavy Duty profile + 65Mn high hardness = highest pre-load retention in the range
  • 🔒 Dual locking mechanism - conical spring pre-load + radial rib grip on both faces
  • 🛡️ No hydrogen embrittlement - cold mechanical zinc process; safe for 420-500 HV spring steel
  • 🌐 Uniform zinc coating - consistent protection on all surfaces including serrations and recesses
  • 🔄 Reusable - retains locking strength if not deformed or damaged during removal
  • 🔀 Stackable - same-direction for higher force; back-to-back for greater deflection
  • 🏭 Bulk supply ready - available in bags, boxes, and custom packaging for production lines

Typical Applications

  • Heavy industrial machinery and equipment subject to severe vibration
  • High-torque structural bolted connections requiring hydrogen embrittlement-free coating
  • Automotive powertrain, suspension, and chassis high-load joints
  • Power generation equipment - turbines, generators, compressors
  • Wind turbine tower and nacelle bolted flanges
  • Construction steel structures and prefabricated heavy buildings
  • Mining, quarrying, and off-highway equipment
  • Rail and transportation heavy-duty assemblies

Product Gallery

Ribbed Safety Lock Washer VS Series Heavy Duty - 65Mn Spring Steel / Mechanically Zinc Plated

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Why Choose FULLERKREG?

🏆 Standard Compliance - Full DIN 9250 Type VS dimensional conformance, with NFE 25-511 cross-reference support
🔬 Material Traceability - 65Mn spring steel mill certificates and mechanical zinc 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, stacking calculations, and custom specifications
⚙️ Broad Range - VS Series and S Series available in A2, A4 stainless steel and 65Mn spring steel grades

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