A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 4140-01-502-6496
NSN 5920-00-445-3585
NSN 5975-01-519-8899
NSN 6645-00-134-9358
NSN 6135-00-334-4500
NSN 5945-01-215-1190
NSN 6105-01-651-5330
NSN 5835-01-061-1647
NSN 5855-01-459-7508
NSN 6620-01-259-2411
NSN 5935-01-569-1455
NSN 5996-00-661-1151