A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5935-01-378-5109
NSN 6645-01-177-6021
NSN 6150-01-143-5972
NSN 5996-01-566-8996
NSN 5910-01-218-2978
NSN 5935-00-283-2950
NSN 2925-00-355-5130
NSN 5935-01-011-2770
NSN 5910-00-637-2609
NSN 5975-00-244-7807
NSN 5998-00-517-9170
NSN 5915-00-244-1702