A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6220-01-592-6113
NSN 5930-00-353-4235
NSN 5910-01-061-9711
NSN 6240-01-103-0321
NSN 5895-01-359-2040
NSN 5990-00-177-2924
NSN 5960-00-402-7563
NSN 6130-01-020-7307
NSN 5975-01-296-5546
NSN 2925-00-845-1480
NSN 6150-01-581-2376
NSN 5996-00-205-2933