A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 5905-00-913-3679
NSN 5895-01-643-5461
NSN 5975-00-420-4473
NSN 5930-01-551-7343
NSN 5915-00-581-2651
NSN 5996-00-222-6049
NSN 6240-01-094-2280
NSN 5910-01-249-5853
NSN 6650-01-005-0714
NSN 6220-00-296-4101
NSN 5965-01-399-8454
NSN 6320-01-515-5346