Material of construction: Steel except for brass arming spindle and brass safety collar.

Position and method of fixing in bomb: Two fuzes are screwed into the base plate of the bomb and secured by the locking ring.

Components of explosive train: Incorporated in a large Navy gaine.

Fuzes likely to be found with: One other B-2 (b).

Delay times: 0.2-second delay incorporated in Navy gaine.

Threads: 2 17/32 inches in diameter; 4 threads per inch.

Description: The fuze body houses the striker, the spring, the safety collar, and the ar-ming spindle. The upper end of the body is internally threaded, right-hand, to receive the bushing which secures the safety collar in position. The arming assembly consists of the vanes and a long reach rod which slide-fits over the arming spindle. A locking ring screws down over a shoulder of the body to secure the fuze in the bomb.

The safety collar and the top of the striker are internally threaded, left-hand, to receive the arming spindle. The collar rests on a shoulder of the fuze body and prevents the stri-ker from moving downward when fuze is unarmed. The striker and safety collar are pre-vented from rotating by the locating screw and locating pin respectively.

Operation: On release from the plane, the arming vanes rotating, unscrewing the arming spindle from the striker. On impact the striker moves against the spring and pierces the primer in the gaine.

Remarks: The fuze uses an oversize Japanese Navy gaine in which is incorporated the primer, slight delay, detonator and booster.

Figure 124 – B-2 (b) Bomb Fuze.