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| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 2 – Section 1 |
| Army Bomb Fuzes |
| Fuze For Type 3 Bomb A-6 (a) |
| Bombs in which used: Type 3 1/2-kg. |
| Color: Natural brass. |
| Over-all length: 1 7/16 inches. |
| Over-all width: 1 inch. |
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Material of construction: Brass except steel spring and striker and copper shear wire and nose cap. |
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Position and method of fixing in bomb: Screwed into nose. Secured by a grub screw. |
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Components of explosive train: Primer flash cap, two relay pellets of black powder, cy-clonite booster with lead azide detonator. |
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Fuze likely to be found with: None. |
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Delay times: Instantaneous. |
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Threads: 1 3/16 inches in diameter, 16 threads per inch. |
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Description: The steel striker is held in the brass body by a soft copper shear wire. A spring is positioned between the striker and the movable primer carrier. The vane hub screws down on the portion of the striker that extends above the fuze body. A locking screw in the top of the striker prevents the vane assembly from falling away. |
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Operation: The vanes rotate, screwing the vane assembly to the top of the striker where it is stopped by the locking screw head. The fuze is now armed. On impact the shear wire is broken and the striker is driven inward. Simultaneously, the movable primer carrier moves forward against the spring until the firing pin pierces the primer. |
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Remarks: The fuze is armed after 4 1/2 turns of the vanes. |
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Figure 97 – A-6 (a) Bomb Fuze. |
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