Part name assigned by manufacturer is spur washer
A washer which is usually round with a centrally located hole. Its edges and two bearing surfaces are so designed that applied pressure brings into play the spring tension and/or frictional locking principle which materially resists any tendency toward turning. It may be made of one or two pieces
Classification: Spring washers and other lock washers, iron or steel
NSN 5996-01-322-4838
NSN 6650-00-495-5210
NSN 6130-00-470-8589
NSN 6610-00-944-2925
NSN 6135-01-265-1384
NSN 5855-00-198-3197
NSN 5945-01-111-9954
NSN 5915-01-524-9296
NSN 5920-01-087-9265
NSN 6320-01-547-9877
NSN 6240-01-284-6482
NSN 2925-01-125-4800