DISC-LOCK Australasia’s Disc-Lock Safety Wheel Nut is a vibration proof wheel nut, specifically designed to prevent wheel loss in commercial vehicles such as trucks, trailers and buses.
According to Disc-Lock, their Safety Wheel Nuts are far superior in terms of safety than conventional wheel nuts. The shock and vibration, which cause existing wheel nuts to come loose, cause Disc-Lock Safety Wheel Nuts to lock.
Unlike a conventional wheel nut the Disc-Lock Safety Wheel Nut is split into two sections, comprising a nut and a hexagon-flanged washer. Both sections (which are joined together to form a one-piece assembly) have interlocking cams.
When subjected to road shock or vibration, the most common causes of wheel nut loosening, the interlocking cams of the Disc-Lock Safety Wheel Nut attempt to rise against each other.
As the angle of the cams is greater than the pitch angle of the threads on the stud, a wedging action takes place and the Disc-Lock Safety Wheel Nut locks and will not come loose, thus keeping the wheel on the axle.
Disc-Lock Safety Wheel Nuts are now enjoying huge success in Europe and America. In 2003, Disc-Lock Europe was presented with the Vehicle Safety Invention Award for its Disc-Lock Safety Wheel Nut product at the Brakes Fleet Safety Forum Awards for Excellence. The awards celebrate achievements and best practice in the field of risk management.
The Disc-Lock Safety Wheel Nut is available in M20 and M22 in coarse and fine thread and has a Dacromet 320 coating. It is important to note that this is an engineering solution to loosening of fasteners due to vibration. They are reusable and do not break down under heat, oil and normal chemical exposure as do nuts with Nylon or chemical gluing compounds.