A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 5965-01-262-3513
NSN 5945-01-259-6484
NSN 6620-01-392-6180
NSN 6685-01-154-4139
NSN 5960-00-393-2505
NSN 6150-01-177-9550
NSN 5999-01-590-4220
NSN 5915-01-232-0860
NSN 5985-00-280-8057
NSN 6645-00-251-0688
NSN 5996-00-424-8883
NSN 5855-01-210-7636