MS51991C (AMENDMENT 1), MILITARY STANDARD: INSERT, SCREW THREAD - LOCKED IN, RING LOCKED, SERRATED (06-AUG-1997)

MS51991C (AMENDMENT 1), MILITARY STANDARD: INSERT, SCREW THREAD - LOCKED IN, RING LOCKED, SERRATED (06-AUG-1997)., This amendment forms a part of MS51991C, dated 28 Jun 76, and is approved for use by all Departments and Agencies of the Department of Defense.