A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 5925-01-281-6507
NSN 6145-00-020-6708
NSN 6650-01-081-1537
NSN 5960-01-449-1310
NSN 6610-01-364-8295
NSN 6220-01-400-2108
NSN 6135-01-523-0370
NSN 5930-01-334-0198
NSN 6135-00-120-1026
NSN 5950-01-435-6354
NSN 5960-01-256-6956
NSN 4140-01-342-8677