A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6650-01-198-7601
NSN 5990-01-507-7495
NSN 6110-00-288-4179
NSN 5895-01-220-1418
NSN 5998-01-605-5965
NSN 5920-01-393-5460
NSN 6650-01-258-5871
NSN 5835-00-470-4295
NSN 5950-01-168-8782
NSN 6685-01-473-1997
NSN 6105-01-145-5046
NSN 6130-00-431-6059