A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6110-00-775-7480
NSN 4140-00-911-1485
NSN 2925-01-504-3058
NSN 5975-01-390-2703
NSN 5998-01-435-4443
NSN 6220-01-576-4585
NSN 5915-00-007-9057
NSN 6145-01-495-2671
NSN 6320-01-519-8767
NSN 5905-00-730-4908
NSN 5999-01-121-7661
NSN 6110-00-861-1948