A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6610-01-175-9045
NSN 5925-01-100-0970
NSN 5945-01-565-0657
NSN 6150-00-842-0873
NSN 4140-00-254-7257
NSN 6650-01-493-6638
NSN 6150-00-332-5893
NSN 5990-01-335-7948
NSN 5985-01-134-7511
NSN 7035-01-061-6424
NSN 5915-01-330-6788
NSN 6135-01-497-4516