A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6130-01-588-3561
NSN 6135-01-633-2066
NSN 5945-01-120-5490
NSN 5905-00-468-1913
NSN 5910-01-426-8741
NSN 6620-01-448-1423
NSN 5950-01-046-1775
NSN 5835-01-610-5744
NSN 5835-01-069-5433
NSN 7035-00-529-3128
NSN 6110-01-419-4951
NSN 5998-01-434-4438