AN504 (REV. 6), AIR FORCE/NAVY AERONAUTICAL STANDARD: SCREW, TAPPING, THREAD CUTTING, ROUND HEAD, MACHINE SCREW THREAD (04-MAR-1982)
AN504 (REV. 6), AIR FORCE/NAVY AERONAUTICAL STANDARD: SCREW, TAPPING, THREAD CUTTING, ROUND HEAD, MACHINE SCREW THREAD (04-MAR-1982).