Description
The M57 impact fragmentation hand grenade is used to supplement small arms fire against the enemy in close combat. the grenade produces casualties by high velocity projection of fragments.
Hand grenade M57 is assembled with an electrical impact fuze M217 which incorporates a secondary pyrotechnic delay feature which detonates the grenade if it fails to detonate upon impact. The grenade incorporates a safety clip. The body of the grenade is constructed of two pieces of thin-wall sheet steel, and has a notched fragmentation coil liner. The body contains a high explosive filler.
Fuze M217 is equipped with a safety pin, the split end of which is either spread or has a diamond crimp, and a pull ring. IMPACT is embossed on the safety lever. (Older models had red safety levers with or without IMPACT printed thereon in black). The major components are as follows, a bouchon assembly, a fuze body assembly (which contains a thermal power supply, and arming delay thermal switch, a delay detonation terminal switch assembly, an impact switch assembly and an electric detonator), and a booster pellet. The bouchon assembly consists of a striker, striker spring, a striker hinge pin, safety lever and safety pin with pull ring. The fuze body assembly is hermetically sealed.
Olive drab with yellow markings.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Source(s)
TM 43-0001-29, Grenades (chg 4, 2002)
