A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6610-00-556-1870
NSN 5920-01-193-5465
NSN 2925-01-467-1192
NSN 6645-01-598-8118
NSN 5965-00-925-1725
NSN 5998-00-689-9749
NSN 6645-01-443-4854
NSN 6135-01-313-8323
NSN 5990-01-591-0701
NSN 2925-00-497-7808
NSN 5975-01-381-3543
NSN 5965-01-165-9787