Grip the surfaces
Radial serrations engage the underside of the bolt head or nut and the clamped material.
Wedge-locking technology
Nord-Lock Original Washers
A two-piece washer system that secures bolted joints against rotational loosening under vibration and dynamic loading.
Nord-Lock Group technologyProduct overview
Built for secure, serviceable joints.
Nord-Lock Original Washers use cams on the inner faces and radial serrations on the outer faces. The serrations grip the joint while the cam geometry turns attempted loosening into increased bolt tension.
- High resistance to vibration-induced rotational loosening
- Locking action based on geometry rather than friction alone
- Helps preserve clamp load in safety-critical joints
- Straightforward installation with standard fasteners
- Suitable for a broad range of industrial applications
How it works
The wedge-locking principle
The paired washers are installed cam face to cam face. Their outer serrations engage the fastener and joint surfaces.
Direct movement to the cams
When rotation begins, movement occurs between the two inner cam faces.
Raise bolt tension
The cam angle is greater than the thread pitch, so the cams must climb before the fastener can loosen.
Hold the joint
That wedge effect opposes rotation and helps the bolted joint retain its clamp load.
Typical applications
Where this solution fits.
01Heavy machinery and construction equipment
02Wind turbines and power generation
03Rail and transport systems
04Manufacturing and processing equipment
05Structural and safety-critical connections
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