MS16637 and MS16638
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- MS16637, MILITARY STANDARD, SCREW, SHOULDER, SOCKET HEAD, HEXAGON ALLOY STEEL, UNCOATED, UNC-3A (18 DEC 1958) [S/S BY MS51975]
- MS16638, MILITARY STANDARD, SCREW, SHOULDER, SOCKET HEAD, HEXAGON ALLOY STEEL, CADIUM OR ZINC PLATED, UNC-3A (18 DEC 1958) [S/S BY MS51975]
- MS51975E, MILITARY STANDARD, SCREW, SHOULDER - SOCKET HEAD, HEXAGON, ALLOY STEEL, CADMIUM PLATED, UNC-3A (3 MAR 1995) [S/S BY NASM51975]
- MIL-S-21472C, MILITARY SPECIFICATION SCREW, SHOULDER, HEXAGON SOCKET-HEAD AND SLOTTED-HEAD GENERAL SPECIFICATION FOR (31 OCT 1988) [S/S BY NASM21472]
- NASM21472, ADOPTION NOTICE (25 NOV 1998)
