A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6620-01-559-1921
NSN 4140-01-397-6940
NSN 6650-01-115-7981
NSN 6240-00-740-8901
NSN 6620-01-571-0900
NSN 6650-00-009-1427
NSN 5925-01-025-6167
NSN 5895-01-431-9236
NSN 5950-01-351-7528
NSN 6110-01-287-8988
NSN 5965-01-251-4381
NSN 5905-01-632-1080