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M521
#WIP FUZES
Region
United States
Category
Ammunition, Missiles and precision weapons
Armament 107 mm (4.2 in) mortar bombs. Development By US Army Ordnance for use in M328 and M328A1 mortar bombs. Description This is a super-quick or delay impact fuze that may be set via a slotted turnscrew on the fuze body. If set for SQ, on firing, centrifugal forces move a radial interrupter outward, opening a flash channel. Two radial plungers move outward, releasing the M1 delay plunger. A centrifugal latch rotates and locks detents in the outward position. On impact, the firing pin crushes the cup and fires
the M24 detonator, which sends burning gases down the flash tube. If the fuze is set to delay, the interruptor stops the burning gases, but the M1 plunger moves forward striking the delay firing pin, firing the M2 delay, consisting of the M54 primer, a 0.05 second delay and the M7 relay. The M521 fuze is identical to the M48 , except for the diameter of the rear body and the fuze threads. Manufacturer US government contractors.