Over-all length (with gaine): 2 3/8 inches.

Over-all length (without gaine): 1 5/8 inches.

Maximum diameter: 1 inch.

Threaded length: 5/16 inch.

Number of threads: 5, right-hand.

Construction: The fuze body is of two-piece brass construction. The upper part is threaded (R.H.) into the lower part, with the striker head protruding from the upper fuze body. The striker assembly is supported by steel wedges which rest beneath the striker sleeve and two coiled springs. The steel wedges are held in position by the lower portion of a circumferential latch spring which is fitted around the striker sleeve. An arming collar surrounds a portion of the striker assembly and the upper portion of the latch spring. This collar is supported by the lower of two striker supporting coiled springs and the latch spring.

Operation: When the projectile is fired, setback forces the arming collar down until the notch on the inner side of the collar engages the latch springs. As the projectile decele-rates, the lower spring forces the arming collar up, thus pulling the latch spring collar free of the wedges. Centrifugal force moves the wedges out, leaving the striker suppor-ted only by the coiled springs. On impact, the striker is driven down into the primer.

Figure 321 – Type 88 Small Instantaneous Fuze.