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Lend Lease Impressions: 57 mm M1 Anti-tank Gun

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"57 mm M1 Anti-tank Gun

American 57 mm M1 Anti-tank Gun

The gun has a semiautomatic vertical sliding breech, the semiautomatic mechanism is a mechanical type. The mount has split trails. The gun fires one-piece armour piercing shot (without explosive filler).

The following is a comparison of main characteristics of the American 57 mm anti-tank gun and our 45 mm anti-tank gun mod. 1942, 57 mm IS-1 anti-tank gun, and 76 mm ZIS-3 gun.

Characteristics
45 mm anti-tank gun mod. 1942
American 57 mm M1 gun
57 mm IS-1 anti-tank gun
76 mm ZIS-3 divisional gun
Mass in battle position, kg
570
1140
1120
1120
Shell mass, kg
1.43
2.85
3.14
6.5
Muzzle velocity, m/s
870
815
900
655
Penetration of a K-2400 armour plate at 90 degrees




100 meters
70 mm
78 mm
98 mm
75 mm
300 meters
65 mm
70 mm
91 mm
72 mm
500 meters
61 mm
63 mm
86 mm
69 mm
1000 meters
51 mm
48 mm
71 mm
61 mm

The American 57 mm anti-tank gun weighs about as much as our 57 mm IS-1 anti-tank gun, but the penetration is significantly less than that of our gun, and is only somewhat higher than that of the 45 mm anti-tank gun mod. 1942, which weighs almost half as much as the American gun.

As a result of trials performed with this gun, it was established that the main drawback is the dependence of the recoil mechanisms on the temperature of the hydraulic fluid (in winter conditions). Until the fluid is heated, the gun will not return to its original position after recoil.

The gun has insufficient clearance, the diameter of the wheels is too small, and the suspension is rigid, which lowers the qualities of the gun on maneuver, especially when pushing it across the battlefield with the force of the crew. 

The design of the gun does not satisfy modern requirements for anti-tank guns, and makes it suitable for stationary defenses only.

57 mm armour piercing tracer shot

Ammunition for the 57 mm M1 anti-tank gun

57 mm armour piercing tracer shot, American make
The results of trials were satisfactory. The shot is a modern design, but it is inferior to domestic 57 mm armour piercing shells due to the higher muzzle velocity of the latter.


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