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The M13 link, formally Link, Cartridge, Metallic Belt, 7.62mm, M13, is the U.S. military designation for a metallic disintegrating link specifically designed for ammunition belt-fed firearms and 7.62×51mm NATO rounds. It was introduced in the mid-20th century.[1] It is the primary link type for the United States and among NATO for the 7.62×51mm NATO cartridge. As of 2017[update], it has been in use for over 60 years and is used on the Dillon M134D Minigun, M60 Machine Gun, FN MAG/M240, Mk 48, MG3, HK21, MG5, UKM-2000, K16, SS-77, and Negev NG-7, among others. Some countries redesignated the M13 link when it was adopted.