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    What is the Disc-Lock Safety Wheel Nut?

The Disc-Lock Safety Wheel Nut is a free spinning, vibration proof wheel nut, specifically designed to prevent wheel loss from commercial vehicles such as trucks, trailers and buses with spigot mounted wheel fixings. 

However, the product can also be used for a wide range of high vibration purposes.

 

   
   

Disc-Lock Safety Wheel Nut Technical Specification

SIZE & THREAD

WIDTH ACROSS
THE FLATS

HEIGHT

FLANGE
DIAMETER

A B C D

M18 x 1.5

34.0mm

29.0mm

48.0mm

M20 x 1.5

34.0mm

29.0mm

48.0mm

M20 x 2.5

34.0mm

29.0mm

48.0mm

M22 x 1.5

38.0mm

33.5mm

52.5mm

7/8"-11BSF (Scania)

38.0mm

33.5mm

52.5mm

7/8"-14UNF (Volvo)

38.0mm

33.5mm

52.5mm


The Disc-Lock Safety Wheel Nut is manufactured from 1045 steel, heat treated to Rockwell C 32-36, coated in Dacromet.
The Disc-Lock Safety Wheel Nut received TÜV Approval No. 57 8703/01 in 1994.
The Disc-Lock Safety Wheel Nut was approved by leading Lloyd's of London commercial motor insurer - the Crowe Insurance Group in 1997.

 

 

    
    How does the Disc-Lock Safety Wheel Nut work?

The Disc-Lock Safety Wheel Nut is split into two sections, comprising a nut and a hexagon washer. Both sections have interlocking rising cams which are joined together to form one assembly. When subjected to road shock or vibration, the most common causes of wheel loss, the interlocking cams of the Disc-Lock Safety Wheel Nut rise against each other. As the angle of the cams is greater than the pitch angle of the thread 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 considered to be 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.