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This bomb is of a single-piece construction, either cast or spun, slightly streamlined in shape, with a semi-pointed nose. The threaded nose opening receives a fuze-seat liner and a steel plug, which can be removed, allowing an instantaneous nose fuze to be inserted when fragmentation effect is desired. Suspension lugs are welded to the case; for dive-bombing, trunnions on a band may be installed. The filler is cast TNT with a wax pad employed in the nose to cushion the explosive against premature detonation on impact with an armored target. One Auxiliary Booster M104 is used, positioned just before the Adapter Booster M102. In the AN-M58A1, 9.5 pounds of Amatol are removed and replaced by 31.5 pounds of steel to increase the penetration of the bomb. To enable the S.A.P. bomb to be used with anti-withdrawal fuzes, the bomb incorporates base plate locking pins and the Adapter Booster M102A1. Newer models eliminate the Auxiliary BoosterM104, and utilize Picratol for the main charge.
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