MS51990B (AMENDMENT 3), MILITARY STANDARD: RING, LOCK, SERRATED (20-OCT-1997) [S/S BY A-A-59558]

MS51990B (AMENDMENT 3), MILITARY STANDARD: RING, LOCK, SERRATED (20-OCT-1997) [S/S BY A-A-59558]., This amendment forms a part of MS51990B, dated 19 JANUARY 1989, and is approved for use by all Departments and Agencies of the Department of Defense.