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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 5 - Section 4 |
| NAVY PROJECTILE FUZES |
| Type 5th-Yr. - Nose Fuze |
| Use: |
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8-cm ordinary projectiles (fixed and semifixed). |
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12-cm ordinary projectiles (semifixed). |
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14-cm ordinary projectiles (bag). |
| Over-all length (with gaine): 5 1/8 inches. |
| Over-all length (wihtout fuze): 1 15/16 inches. |
| Maximum diameter: 1 3/4 inches. |
| Threaded length: 3/4 inch. |
| Number of threads: 9 R.H. |
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Construction: The fuze body is of two-piece brass construction, with the upper part, or nose cap, threaded (R.H.) onto the lower part. The lower portion is threaded (L.H.) in-ternally to take the gaine. The gaine is made of light steel. A heavy striker fits against the interior top of the nosepiece, which is beveled to facilitate functioning with a low angle of impact. The lower fuze body contains a primary primer and a secondary striker. |
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Operation: On impact, the nose cap is sheared off or crushed, forcing the first striker into the first primer. This explosion forces the secondary striker down, shearing the shear pin and causing the gaine to function. |
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Figure 439 – Type 5th-Year Nose Fuze. |
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