A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5945-00-683-8334
NSN 6685-00-140-5237
NSN 5960-01-367-6153
NSN 6320-01-578-6006
NSN 5915-00-009-6718
NSN 6650-00-952-4500
NSN 6150-01-152-1073
NSN 5950-00-258-4445
NSN 5910-01-065-0977
NSN 5930-01-570-5537
NSN 5925-00-921-1171
NSN 5925-00-642-4209