Dual-Stacked Self-Locking Washer 65Mn Carbon Steel
High-performance anti-loosening washers with wedge-locking principle and multi-tooth surface engagement. Dacromet coating provides 500+ hours NSS testing protection for extreme environments.
Advanced Anti-Loosening Technology
Engineered with wedge-locking principle and dual-layer design for maximum connection strength in high-vibration and dynamic load applications.
Wedge-Locking Principle
Two interlocking parts with multi-tooth surface engagement create superior grip strength that prevents loosening under extreme vibration and dynamic loads.
Glue-Bonded Pairs
Wide-tooth surfaces bonded with industrial adhesive for easier installation and improved efficiency during assembly operations.
Long-Term Stability
Maintains consistent performance in extreme environments, ensuring reliable connections for critical applications in railways, wind energy, and heavy machinery.
Premium Materials & Coatings
Engineered with 65Mn spring steel and advanced Dacromet coating for unmatched performance in demanding industrial applications.
65Mn Spring Steel
- High-carbon manganese steel composition
- Exceptional elasticity and fatigue resistance
- Maintains performance under repeated impacts
Dacromet Coating
- 500+ hours neutral salt spray testing
- Superior to traditional zinc plating
- No hydrogen embrittlement risk
Alternative Materials & Finishes Available
Choose from our comprehensive range of materials and surface treatments to match your specific application requirements.
65Mn + Dacromet
Superior corrosion resistance and high-strength performance
65Mn + Black Oxide
Enhanced wear resistance and anti-corrosion properties
SS316 + Natural
Excellent rust protection with clean, bright finish
SS304 + Natural
Highly corrosion-resistant, ideal for harsh environments
Complete Size Specifications
Comprehensive range from M3 to M130 with metric and imperial compatibility. All dimensions precisely manufactured to DIN 25201 standards.
| Washer Size | Bolt Size Metric | UNC | d1 (mm) | d2 (mm) | Thickness T (mm) | Min Package (pairs) | Weight Kg/100 pairs |
|---|---|---|---|---|---|---|---|
| NL3 | M3 | #6 | 3.9 | 7.0 | 1.8 | 200 | 0.03 |
| NL6 | M6 | 1/4" | 7.2 | 13.5 | 2.5 | 200 | 0.20 |
| NL8 | M8 | 5/16" | 8.7 | 16.6 | 2.5 | 200 | 0.28 |
| NL10 | M10 | 3/8" | 10.7 | 21.0 | 2.5 | 200 | 0.43 |
| NL16 | M16 | 5/8" | 17.0 | 30.7 | 3.4 | 100 | 1.50 |
| NL20 | M20 | - | 21.4 | 39.0 | 3.4 | 100 | 2.03 |
| NL30 | M30 | 1-1/8" | 31.4 | 47.0 | 5.8 | 25 | 4.20 |
| NL48 | M48 | 1-3/4" | 49.6 | 75.0 | 7.0 | 25 | 12.00 |
Complete size range M3-M130 available. Custom sizes can be manufactured upon request.
Powering Critical Industries Across the Globe
From high-speed railways to renewable energy infrastructure, our precision-engineered washers and fasteners ensure safety and reliability in the world's most demanding industrial environments.
Railway & Transportation
High-speed rail systems, freight locomotives, and urban transit infrastructure requiring vibration-resistant fastening solutions
Renewable Energy
Wind turbine assemblies, solar panel mounting systems, and energy storage facilities with extreme weather resistance
Mining & Heavy Machinery
Excavators, bulldozers, and mining equipment operating in harsh conditions with maximum load requirements
Automotive Manufacturing
Engine assemblies, chassis components, and safety systems requiring precision tolerances and crash-test durability
Construction & Infrastructure
Structural steel frameworks, bridges, and high-rise buildings requiring seismic-resistant fastening systems
Aerospace & Defense
Aircraft assemblies, satellite systems, and defense equipment with zero-failure tolerance and extreme environment specs
Global Manufacturing Excellence
Serving Belt & Road Initiative markets with world-class quality standards
Ready to Secure Your Critical Connections?
Get professional engineering support and custom quotes for your DIN 25201 washer requirements. Our team provides technical specifications and application guidance within 24 hours.
Insoer Fasteners · Professional Manufacturing Since 2006 · sales@insoer.com