A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 5945-00-346-7808
NSN 6240-00-056-1571
NSN 6320-01-541-7585
NSN 6620-01-319-9804
NSN 6650-01-320-0529
NSN 6685-00-215-1997
NSN 6220-01-601-5320
NSN 5930-01-374-7993
NSN 6220-01-427-2333
NSN 6135-01-101-5039
NSN 7035-00-020-2227
NSN 6105-01-627-7765