A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6620-01-617-3915
NSN 6645-01-250-2702
NSN 6135-01-437-6409
NSN 5999-01-585-9589
NSN 6220-00-614-7174
NSN 6320-01-585-8468
NSN 5935-00-487-9672
NSN 5935-01-355-6904
NSN 5945-01-041-0857
NSN 6645-01-160-7707
NSN 5945-00-269-5375
NSN 5835-01-187-8986