AN502 and AN503
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- AN502 (REV6), AIR FORCE/NAVY AERONAUTICAL STANDARD SCREW - MACHINE, DRILLED FILLISTER HEAD, FINE THREAD (11 MAY 1953)
- AN503 (REV. 5), AIR FORCE/NAVY AERONAUTICAL STANDARD SCREW - MACHINE, DRILLED FILLISTER HEAD, COARSE THREAD (11 MAY 1953)
- PROCUREMENT SPECIFICATION: MIL-S-7839B, MILITARY SPECIFICATION, SCREW, STRUCTURAL, AIRCRAFT (21 DEC 1973) [S/S BY NASM7839]
