As a professional manufacturer of metal stampings based in Yinzhou, Ningbo, Zhenhua Hardware has long specialized in precision fasteners. Targeting the critical industry pain point of bolts loosening under vibration, the company proudly introduces its DIN25201 Wedge Lock Washers, offering a "never-loosen" connection solution for rail transit, construction machinery, new energy equipment, and other demanding sectors
1.What are DIN25201 Wedge Washers?
Wedge Washers are mechanical locking fasteners designed for use in pairs, with DIN25201 being the dominant international standard.
The system consists of two identical washers. Each has radial serrations on one side and a wedge-shaped cam surface on the other. The key design feature is that the cam angle (α) is greater than the thread pitch angle (β). During installation, the two washers are placed cam-to-cam, with the serrated sides facing the nut and the workpiece.
Instead of relying on friction, they use tension to lock. When subjected to vibration or shock, any loosening movement is restricted to a slight lifting between the two inner cam surfaces. Because α > β, this movement creates a self-locking wedge effect that tightens the connection rather than loosening it, providing absolute security.
2. Core Applications
DIN25201 Wedge Washers are engineered for critical joints exposed to severe vibration, dynamic loads, and shock:
- Rail Transportation: High-speed rail, subway bogies, track fasteners, and carriage connections
- Construction Machinery: Excavators, cranes, mining equipment chassis, and hydraulic systems
- New Energy: Wind turbine towers & nacelles, solar panel mounting structures
- Automotive & EV: Chassis, engines, transmissions, and electric vehicle battery packs
- Industrial Equipment: Machine tools, compressors, pumps, and automated production lines
3.Solving Critical Industry Pain Points
- Unmatched Reliability: 100% mechanical lock, unaffected by vibration, temperature, or lubrication; proven by Junker tests
- Lower Maintenance Costs: Lifetime freedom from re-tightening and inspections, drastically reducing downtime
- Eco-Friendly: No chemicals, no aging, fully recyclable