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| U.S.N.B.D. - LAND MINES |
| LAND MINES |
| ANTI-TANK MINES |
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DATA |
U.S. ARMY |
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DIAMETER |
6 in. |
M4 MINE |
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HEIGHT (with spider) |
4 in. | |
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TOTAL WEIGHT |
10.6 lbs. | |
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EXPLOSIVE WEIGTH (Cast TNT) |
6 lbs. |
(ANTI-TANK) |
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MATERIAL |
Steel | |
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COMPONENTS: |
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The metalic anti-tank mine M4 is identical with the M1A1 type (page 185) except for the booster, the fuze, and the activator wells. The M4 has one activator well on the bottom and one on the side. Since the booster, after loading, become an integral part of the mine, and since the M1A1 and M4 boosters and fuzes are not interchangeable, it is especially important that the M1A1 and M4 mines and their respective fuzes be kept separated. However, the two mines are assembled, armed, and employed in the same manner. The advantage of the M4 mine is that the internal construction of the M4 fuze makes it safe to re-use, because it is not made more sensitive by repeated light blows. |
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(a) Fuze: The M4 fuze functions on the "cricket" or "oilcan" principle. This means that the firing pin spring is a convex metal diaphragm which snaps down under pressure to detonate the fuze. The M1A1 fuze uses a cocked firing pin spring and shear pins. In appearance, the only difference is that the primer and the detonator of the M4 fuze are contained within the fuze body instead of protruding from the bottom as in the M1A1 and the bottom edge is sharp rather than beveled. |
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(b) Booster: The M4 booster is identical with M1A1 booster except that it has a flat top with a crossed scar to insure rupture of the booster shell by the detonator, while the M1A1 booster has a cavity in the top to receive the protruding primer and detona-tor of the M1A1 fuze. |
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ASSEMBLY: |
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The mine is assembled in the same manner as the M1A1 mine. (See page 185). |
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ARMING: |
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The safety fork is removed from the fuze by pressure of the thumbs on the prongs. The fork is not remoevd until after the mine is laid, and is left beside the mine attached to its cord, never between the body and the spider. Before the mine is taken up, the safety fork is replaced. |
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COLOR AND MARKING: |
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The bottom is 3/4 of an inch on the side are painted yellow, the balance of the mine is painted olive drab. Type, model, lot number, etc. are printed on the head. |
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REMARKS: |
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Protective bag covers made of moisture-resistant, mildewproof fabric are provided with this mine to prevent dirt and other foreign matter from working between the mine body and the spider. The cover is cylindrical in shape, 8.75 inches in diameter, 9 inches high, and open at one end.
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