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| U.S. EXPLOSIVE ORDNANCE |
| PART 1 - PROJECTILES, PROPELLANT, AND PROECTILE FUZES |
| Chapter 3 - PROJECTILE FUZES |
| Section 3 - NOSE TIME FUZES FOR PROJECTILES |
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Mk 25 Mods 0-3 |
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Projectiles used in |
5"/54 H.C. and Ill |
| 6"/47 (D.P.) H.C. | |
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Over-all length, inches |
4.55 |
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Diameter at base ogive, inch |
2.40 |
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Threaded length, inch |
0.81 |
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Threads |
7 R.H. |
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Material |
Nose - die-cast lead-zinc alloy |
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Body - brass |
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Base - aluminum |
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Setting times, seconds |
minimum, 0.6 |
| maximum, 45 |
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Description: The Nose Time Fuze Mk 25 is a combination of the Nose Time Fuzes Mk 50 and Mk 51. It has the shape of the 30-second Nose Time Fuze Mk 51, but contains the 45-second clockwork of the Mk 50. The longer, slimmer shape of the Mk 51 is neces-sary because of the more streamlined shape of the 5"/54 and 6"/47 D.P. projectiles with which it is assembled. But, since these projectiles are used in long-range guns, they need the 45-second clockwork. |
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The description of the clockwork in the Nose Time Fuze Mk 18 is equally applicable to the Mk 25. |
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This fuze has slots cut for the setting mechanism, like the slots on the Mk 22 or Mk 50. |
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The Mk 25 is a moisture-resistant design, having gasket placed between the upper and lower caps and between the lower cap and the body, and a silica gel unit in the base cavity to absorb what moisture penetrates the gaskets. This moisture resistance prevents deterioration of the metal parts and the explosive. |
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