Use: Ammunition for 20-mm aircraft, antitank, and antiaircraft guns; 37-mm tank and anti-tank guns.

Over-all length (with gaine): 1 15/16 inches.

Over-all length (without gaine): 1 7/16 inches.

Maximum diameter: 3/4 inch.

Threaded length: 1/4 inch.

Number of threads: 5, right-hand.

Construction: The fuze is of two-piece brass construction with an aluminum striker head. The lower piece houses a centrifugal detent, a primer, and a flash-hole shutter. The gaine threads into the lower piece.

Operation: The centrifugal detent, which supports the striker, is held in place by the striker and detent spring until the projectile deceleartes. The the striker creeps forward and centrifugal force causes the detent to move out. The flash shutter is also moved out by centrifugal force and the fuze is armed. On impact the striker is driven into the primer.

Figure 315 – Type 93 Small Instantaneous Fuze.