A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6620-01-535-0070
NSN 6685-01-359-9166
NSN 6610-01-400-3880
NSN 6105-01-038-8309
NSN 5930-01-464-2530
NSN 5950-00-884-5452
NSN 5999-00-816-9670
NSN 5930-00-493-0403
NSN 5920-01-196-7391
NSN 6145-01-556-5422
NSN 5985-00-977-3228
NSN 6150-01-042-4942