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Gallock - Wedge Lock Washers

Gallock - Wedge Lock Washers ensure the integrity of fastener thread systems by using tension rather than friction, which is the basis of most traditional fastening methods. This provides security to the threaded systems.

Gallock - Wedge Lock Washers consists of two identical flat washers which have a set of cams on one side and a radial knurling on the other. These two washers are supplied glued together, in order to avoid any orientation mistake during assembly.

Functional Principle

  Wedge shaped surface on the inside of the lock washers, radial teeth on the outside.

  Interlocking embedding of the radial teeth with the respective mating surface (When the bolt is tightened).

  System movement only possible between the inside washer surfaces, allowing the securing system to readjust itself automatically.

  Increase in clamping force.


  This unique cam system uses tension to create high force in a fastened joint that is subjected to vibrations.

  Particularly suitable for dynamic loads.

  Very easy to install & remove.

  Also suitable for high-tensile bolts of 8.8, 10.9 and 12.9 and their respective nuts.

  These can be re-used with no reduction in function or quality.

Installation Examples

Working Principle

As shown in the diagram, the angle of the cam " of the washer is larger than the angle of the thread ß. When the fastener is tightened, the knurled surfaces grip both the bearing surface of the fastener and the material into which the screw is being fastened. The larger angle of the cam ", compared to the smaller angle of the screw thread ß, will not allow the screw to loosen because of the tension caused by the cam lifting.