A screw, (as modified) to which has been assembled one or more nonremovable washer(s).
NSN 4140-00-113-1279
NSN 5996-01-514-9292
NSN 6620-01-091-9697
NSN 4140-01-603-0969
NSN 5925-01-524-2585
NSN 5999-00-725-0016
NSN 5960-00-077-1828
NSN 5930-01-186-6793
NSN 5930-00-345-7858
NSN 5965-00-931-5000
NSN 6620-00-234-3369
NSN 5915-01-332-9080