A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6685-00-159-6020
NSN 6650-01-170-5440
NSN 6650-01-327-3068
NSN 2925-01-136-2551
NSN 5935-00-216-7435
NSN 5835-00-510-0890
NSN 6220-01-444-4261
NSN 5985-01-485-4750
NSN 6685-01-196-7782
NSN 6220-00-670-1790
NSN 7035-01-558-9618
NSN 6240-00-031-3112