M67 grenade

The M67 grenade is a fragmentation hand grenade used by the United States military. The M67 is a further development of the M33 grenade, itself a replacement for the M26-series grenades used during the Korean and Vietnam Wars, and the older Mk 2 "pineapple" grenade used since World War I. The M67 grenade has a spheroidal steel body that contains of composition B explosive. It uses the M213 pyrotechnic delay fuze. The M67 grenade weighs in total and has a safety clip to prevent the spoon on the grenade from being triggered in the event the safety pin is accidentally pulled. The safety pin prevents the safety lever, or "spoon" on the grenade from moving and releasing the spring-loaded striker which initiates the grenade's fuse assembly. The M67 is typically known as a "baseball" grenade, because it is shaped like a ball that can be easily thrown. According to the FY2021 US Army Justification, the average cost of a single M67 grenade is around 45 US dollars. The M67 can be thrown by the average male soldier. Its fuse delays detonation between 4 and 5 seconds after the spoon is released. Steel fragments are formed by the grenade body fracturing and have an injury radius of and a fatality radius of , though some fragments can travel as far as . The M33 was the original successor to the M26 fragmentation grenade. It was essentially identical to the M67, but lacked the safety clip that is fitted to the safety lever of the M67. This is a variant of the M67 fitted with the M217 impact fuze and a safety clip on the safety lever. This fuze has an electrical impact function which arms within 1 to 2 seconds and will detonate the grenade upon impact, and a back-up pyrotechnic delay function which will initiate the grenade after 3 to 7 seconds if the impact function fails. The M68 has the same specifications and markings as the M67 except it has a red-painted fuze and lever to indicate it has an impact fuze. Predecessors to the M68, these impact-fuzed grenades used the M33 grenade body fitted with the M217 impact fuze, without a safety clip on the safety lever, and are marked similarly to the M68.