A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-352-7169
NSN 6110-01-633-9660
NSN 5895-01-412-0944
NSN 6685-00-255-5109
NSN 6105-01-296-5907
NSN 6145-01-029-9026
NSN 5960-00-221-9614
NSN 5930-01-140-7338
NSN 6150-00-117-2533
NSN 6105-01-553-3284
NSN 5920-00-868-7651
NSN 5999-00-468-5879