A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6150-01-334-3016
NSN 6240-00-763-7744
NSN 6220-00-822-4426
NSN 5990-01-626-3840
NSN 5835-01-528-7454
NSN 5996-01-319-8876
NSN 6240-00-281-8417
NSN 6685-01-383-6522
NSN 5996-00-548-8762
NSN 5985-00-713-8568
NSN 6105-01-355-5557
NSN 6650-00-473-1259