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M524 Series
#WIP FUZES
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament 81 mm HE and WP smoke bombs. Development Originally developed by US ordnance authorities but now manufactured under licence elsewhere. Description The fuze has an aluminium body threaded externally to fit the round and internally to accept a tetryl booster. The fuze nose is a spring-loaded striker with a slot for selection of super-quick or delay action. Either detonating train is initiated by independent firing pins. The delay train includes a primer and M2 delay charge. Bore safety is provided by a
delayed arming mechanism consisting of a spring-loaded rotor released by setback when the mortar is fired and a timing device. There are two safety pins - one for the internal plunger and the other to secure the setback arming device. Setback trips the arming mechanism release, allowing the arming rotor to turn toward the armed position. This mechanism assures that arming will occur no earlier than 1.25 seconds and no later than 2.5 seconds after the round has left the mortar tube. If delay is selected, the firing pin is not aligned with the M63 detonator and charge detonation occurs 0.05 second after the delay firing pin operates on the delay train through the M2 delay charge. Each mode operates by separate flash tubes upon the M80 detonator, the booster lead charge and the booster. Manufacturer US Military contractors.