A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 6320-01-029-4220
NSN 6220-01-146-2838
NSN 5960-00-157-5983
NSN 5960-00-140-4448
NSN 5835-00-185-4919
NSN 5990-00-557-3672
NSN 5855-01-572-9379
NSN 6610-00-419-6320
NSN 6610-01-259-5296
NSN 5975-00-110-4089
NSN 5910-01-513-8287
NSN 6620-01-090-3803