A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 5835-00-185-4919
NSN 6320-01-300-7994
NSN 6650-01-171-6217
NSN 4140-01-350-8723
NSN 5965-01-311-0094
NSN 5945-01-510-9223
NSN 6610-00-793-0010
NSN 7035-01-013-9889
NSN 5855-01-495-1750
NSN 6645-01-040-8337
NSN 5835-00-279-2887
NSN 6320-01-267-0586