Mk 2 grenade

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Mk 2 Grenade
World War II–era Mk 2 grenade
Type	Time-fused grenade
Place of origin	United States
Service history
In service	1918–1969
Used by	See Users
Wars	World War II Chinese Civil War Korean War Suez Crisis Vietnam War Six-Day War The Troubles Battle of Marawi[1] Iraqi Civil War (2014–2017)[2] Communist rebellion in the Philippines
Production history
Designed	1918
Produced	1918–1950s
Specifications
Mass	About 1 lb 5 oz (600 g) depending upon filling
Length	3.5 inches (89 mm) body 4.5 inches (110 mm) overall
Diameter	2.3 inches (58 mm)
Filling	Varied
Filling weight	Varied
Detonation mechanism	percussion cap & time fuse: 4–5 second delay

The Mk 2 grenade (initially known as the Mk II), also nicknamed the Pineapple is a fragmentation-type anti-personnel hand grenade introduced by the U.S. armed forces in 1918. It was the standard issue anti-personnel grenade used during World War II, and also saw limited service in later conflicts, including the Korean War and Vietnam War. Replacing the failed Mk 1 grenade of 1917, it was standardized in 1920 as the Mk II, and redesignated the Mk 2 on 2 April 1945.

The Mk 2 was gradually phased out of service as the M26-series (M26/M61/M57) grenade was introduced during the Korean War. Due to the tremendous quantity manufactured during World War II the Mk 2 was still in limited issue with the US Army and US Marine Corps throughout the 1950s and 1960s. The U.S. Navy was one of the last users of the Mk 2 when it was finally withdrawn from U.S. military service in 1969, replaced with the M33 series (M33/M67).