A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-00-020-8366
NSN 5998-00-263-7557
NSN 6320-01-198-4024
NSN 5855-01-254-3041
NSN 5965-01-231-9125
NSN 6110-01-227-8597
NSN 6105-01-633-3485
NSN 5965-00-760-5404
NSN 6150-01-121-2194
NSN 5996-00-786-7968
NSN 5925-00-136-0977
NSN 5910-01-257-3539