Home » Ribbed Safety Lock Washer VS Series Heavy Duty 65Mn Black

Ribbed Safety Lock Washer VS Series Heavy Duty 65Mn Black

Ribbed Safety Lock Washer VS Series - Heavy Duty | 65Mn Spring Steel | Black Oxide

FULLERKREG Ribbed Safety Lock Washers VS Series (Heavy Duty) in 65Mn Spring Steel with Black Oxide surface treatment conform to DIN 9250 Type VS. The VS Heavy Duty profile delivers maximum spring force through increased wall thickness and greater cone height, while 65Mn spring steel (420-500 HV) provides superior hardness and spring-back force. The black oxide finish offers a clean matte appearance with basic corrosion protection, ideal for dry indoor and precision assembly applications.

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: Black Oxide (Blackening)
  • 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 Black)

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: Black oxide finish provides minimal corrosion protection. For outdoor or humid environments, consider the Mechanically Zinc Plated variant. For sizes M33 and above, contact FULLERKREG for availability.

Surface Treatment - Black Oxide Explained

Black Oxide (blackening / alkaline black finish) is a chemical conversion coating applied to steel surfaces without dimensional impact. Key characteristics:

  • ⬛ Appearance - uniform matte black finish; professional and aesthetically clean
  • 📐 Dimensional stability - coating 1-2 microns thick; negligible effect on dimensions or fit
  • 🛡️ Corrosion resistance - basic protection for dry indoor environments only; not suitable for outdoor or humid use without additional oiling
  • ⚡ Electrical conductivity - maintains good conductivity for grounding applications
  • ♻️ RoHS compliant - no hazardous substances
  • 🔥 No hydrogen embrittlement - chemical conversion process; safe for high-hardness 65Mn spring steel

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 - 65Mn vs Stainless Steel

Property 65Mn Black (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 Basic (dry indoor only) Good (passivated) Excellent (passivated)
Appearance Matte black Silver/white Silver/white
RoHS Compliant Yes Yes Yes
Best For Max pre-load, dry indoor, black finish Mild outdoor/indoor Marine/chemical

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 Black Oxide (Blackening)
Coating Thickness 1-2 microns (negligible dimensional impact)
Corrosion Resistance Basic - dry indoor environments only
Temperature Range -40 to +120 degrees C (continuous service)
RoHS Compliant Yes

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
  • ⬛ Matte black finish - professional appearance; ideal for visible assemblies requiring aesthetic consistency
  • 📐 Dimensionally stable coating - 1-2 micron black oxide; no impact on fit or clearance
  • 🔄 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

  • Precision instruments and optical equipment requiring black finish and maximum locking force
  • Industrial machinery in dry indoor environments subject to severe vibration
  • High-torque bolted joints in electronics enclosures and control systems
  • Automotive interior and underhood high-load assemblies (dry zones)
  • Robotics and automation equipment requiring aesthetic black hardware
  • Furniture and architectural metalwork with heavy-duty locking requirements
  • Electrical cabinets and control panels with high-vibration environments (indoor)

Product Gallery

Ribbed Safety Lock Washer VS Series Heavy Duty - 65Mn Spring Steel / Black Oxide

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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 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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