A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-01-643-4805
NSN 5920-00-387-5312
NSN 2925-01-415-0264
NSN 5950-01-332-3400
NSN 5975-01-452-9242
NSN 5915-01-540-4491
NSN 6320-01-445-8192
NSN 6150-00-159-5271
NSN 6620-01-068-9995
NSN 5975-01-401-5355
NSN 6105-01-098-8381
NSN 6105-01-528-8027