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

Over-all length (with gaine): 1 9/16 inches.

Over-all length (without gaine): 1 inch.

Maximum diameter: 3/4 inch.

Threaded length: 1/4 inch.

Number of threads: 5, right-hand.

Construction: The fuze is made of brass in one piece. A centrifugal detent supports the striker. Above the striker there is a wooden striker head. The fuze is threaded internally (L.H.) to take the gaine.

Operation: The centrifugal detent, supporting the striker, is held in place by the striker and detent spring until the projectile decelerates. Then the striker creeps forward and centrifugal force causes the detent to move out, arming the fuze. On impact the striker is driven into the primer.

Figure 316 – Type 100 Small Instantaneous Fuze.