The working principle behind the Disc-Lock Washer is simple.

Two washer-shaped pieces (pre-assembled, glued pairs),  with inclined cams on one side and a series of ridges on the other, are mated together and placed between the nut and the joint material upon installation.


Under vibration the nut will attempt to rotate loose. HOWEVER, as the angle of the cams is greater than the pitch angle of the thread on the bolt, a jamming effect is created by the interlocking cams and the non-slip ridges of the Disc-Lock Washer working simultaneously.


This effect prevents loosening and further locks the assembly, thereby maintaining joint integrity. The result is a fastening system that is vibration proof according to Military Standards. (United States Military MIL-STD-1312, Vibration Test 7)