A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5985-01-472-8787
NSN 5905-01-338-7269
NSN 6685-01-461-3223
NSN 5975-00-736-3420
NSN 5975-00-817-4476
NSN 5905-01-130-7626
NSN 5965-01-311-8509
NSN 6240-01-224-7656
NSN 6320-01-571-4530
NSN 5930-00-962-2889
NSN 5996-00-907-9748
NSN 6685-01-267-1404