A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5835-00-729-9305
NSN 5950-00-324-8499
NSN 6645-01-252-9659
NSN 5985-00-310-4311
NSN 6110-01-116-2195
NSN 5930-00-250-0127
NSN 6150-00-263-3451
NSN 6650-01-504-2676
NSN 5996-00-179-9583
NSN 5895-00-819-1273
NSN 5985-00-199-8997
NSN 5925-01-392-7701