A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6105-01-429-0232
NSN 5905-00-780-7971
NSN 6240-01-259-4265
NSN 6110-01-574-6466
NSN 6130-00-752-2584
NSN 5998-01-634-0604
NSN 6685-00-925-2287
NSN 5855-00-179-8588
NSN 5990-01-132-4156
NSN 5990-01-040-1320
NSN 7035-00-205-1932
NSN 6645-01-476-3660