A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5965-00-594-3115
NSN 6110-00-986-8993
NSN 5915-01-648-7354
NSN 6110-00-768-7581
NSN 5835-00-445-5539
NSN 6240-01-087-7082
NSN 7035-01-104-5446
NSN 5975-00-393-1269
NSN 6150-01-168-7926
NSN 5985-01-602-9023
NSN 5835-01-028-2025
NSN 5945-01-059-2605