A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6320-00-139-1090
NSN 5960-01-008-5670
NSN 6220-01-187-7119
NSN 6320-00-809-5744
NSN 5935-01-634-0668
NSN 2925-01-625-5624
NSN 5905-01-157-5614
NSN 5930-00-888-1410
NSN 5895-01-644-9769
NSN 6150-01-025-7338
NSN 6685-01-378-1816
NSN 5895-00-903-3458