A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6240-00-057-9498
NSN 5950-01-221-9465
NSN 5960-00-887-2618
NSN 5999-00-659-0711
NSN 6110-00-105-0428
NSN 5965-00-815-2525
NSN 5935-00-473-6059
NSN 5996-00-146-9746
NSN 5920-01-604-2334
NSN 5930-01-480-5596
NSN 5855-00-151-3853
NSN 4140-00-824-8821