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| U.S. EXPLOSIVE ORDNANCE |
| PART 1 - PROJECTILES, PROPELLANT, AND PROECTILE FUZES |
| Chapter 1 - Projectiles |
| Section 2 - 3-INCH PROJECTILES |
| 3-inch A.A. Mk 31 Mod 1 |
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Guns used in |
3"/50 |
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Overall length, inches |
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With nose fuze |
12.22 |
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Without nose fuze |
8.50 |
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Diameter of base, inches |
2.98 |
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Distance base to band, inches |
1.35 |
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Width of band, inches |
1.00 |
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Diameter at bourrelet, inches |
2.985 |
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Filling |
Cast TNT, Comp. A |
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Weight of filling, pounds |
0.54 |
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Weight of loaded projectile, pounds |
12.90 |
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Charge/weight ratio |
4.1% |
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Cartidge Case |
Mk 7 Mod 9 |
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Primer |
Mk 14, Mk 14 Mod 1 |
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Fuzes |
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Nose |
Mk 45 Mod 12 (V.T.F.) |
| Mk 58 and all Mods (V.T.F. | |
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Auxiliary Detonating Fuze |
Mk 44 Mods 0 and 1 |
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This projectile is specially cavitized to receiver V.T. fuzes and their auxiliary detonat-ing fuzes. No other fuzes may be assemblied. Since V.T. fuzing is employed, no tracer is assembled; instead, the base is solid, and a special sheet-steel base cover plate is wel-ded on, 0.031 inch thick and 2.50 inches in diameter. |
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This projectile replaces the original Mk 31 Mod 0, which has been recalled from service use. The Mod 0 was cavitized to receive the V.T. Fuse Mk 45 Mod 11, which differed from the Mod 12 by having a longer stem and has been declared unserviceable. |
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The V.T. Fuze Mk 58 is currently replacing the Mk 45 Mod 12 in all assemblies. |
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Figure 22. 3-inch A.A. Mk 31 Mod 1 |
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