MS172321 THRU MS172370 (REV. B), MILITARY STANDARD: NUT - SPANNER, AERONAUTICAL (20 DEC 1957) [S/S BY SAE-AS172321 THRU AS172370]
MS172321 THRU MS172370 (REV. B), MILITARY STANDARD: NUT - SPANNER, AERONAUTICAL (20 DEC 1957) [S/S BY SAE-AS172321 THRU AS172370].