For 7.2” shipboard rockets (Mk8, 10, 15) and Hedgehog ammunition for Mk10 and 11 projectors. 5.982” long. Steel, plus steel, brass and Zamak die-casting alloy, copper diaphragm seat gasket. Designed to replace Mk135, Model 2, and other fuzes. Development begun July 1942. Difficulties in arming and firing performance halted production; none issued for service use.
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