A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6150-01-451-4564
NSN 5920-01-323-6369
NSN 5998-00-733-7717
NSN 5925-00-513-7610
NSN 6650-00-539-7298
NSN 2925-01-112-6822
NSN 6130-01-101-7511
NSN 5855-01-557-9470
NSN 5905-01-294-9389
NSN 6105-01-144-5473
NSN 5925-01-240-4048
NSN 5915-00-501-8579