A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6610-01-423-5889
NSN 4140-01-240-1116
NSN 5960-00-963-1285
NSN 7035-00-018-0350
NSN 6150-00-385-9150
NSN 2925-01-444-6676
NSN 2925-00-816-8765
NSN 5905-00-197-3131
NSN 5920-01-367-2236
NSN 5905-01-354-3342
NSN 5935-01-119-6835
NSN 6130-00-328-0261