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United States' T48 Gun Motor Carriage


T48 57 mm Gun Motor Carriage:
United States' T48 57 mm Gun Motor Carriage
Aberdeen Tank Museum


It was ordered to be developed by the Ordnance Committee in April 1942. It was only to be temporary until a more powerful design could be developed.

Originally designed for US and British service but none saw service with US forces. Production for Britain was initiated on October 18, 1942.

Placed on an M3 half-track. The gun was mounted in the center of the vehicle behind the front bulkhead. A gunner's seat pivoted independently of the main gun.

  Weight Muzzle Velocity
HE 6.25 lb 2,720'/sec
AP   2,700'/sec

M1 gun could penetrate 55 mm armor at 1,000 yards. Muzzle velocity of 2,800 ft/sec. Gun was positioned between the 2 windshields and placed in a quick release traveling lock.


  • T48:
    • Production: 1942
    • Manufacturer: Diamond T, Autocar


British Service

Was equipped with British Wireless Set, No. 19.

Russian Service

Re-armed with more powerful Russian 57 mm anti-tank gun.


  T48 Gun Motor Carriage
Crew Commander, driver, gun crew (3)
Physical Characteristics  
Weight 19,000 lb, 21,000 lb
Length 20' 3.5", 21' 5/8"
Height 7', 8' (approximate)
Width 7' 1"
Width over tracks  
Ground clearance 11 3/16"
Ground contact length 3' 10.75"
Ground pressure 12.3 psi
Turret ring diameter  
Main 57 mm M1 gun
Side arms 5: .30 cal Rifles (British)
Main 50, 99
Side arms Grenades: 22
Armor Thickness (mm)  
Hull Front, Upper 0.5"@0°, 6
Hull Front, Lower 6
Hull Sides, Upper 0.25"@0°, 6
Hull Sides, Lower 6
Hull Rear 0.25"@0°, 6
Hull Top 6
Hull Bottom 6
Turret Front  
Turret Sides  
Turret Rear  
Turret Top  
Engine (Make / Model) While 160 AX
Bore / stroke  
Cooling Water
Cylinders I-6
Net HP 147
Power to weight ratio  
Compression ratio  
Transmission (Type) Dual range synchromesh
8 forward, 2 reverse
Steering Cam and twin lever
Steering ratio  
Electrical system  
Fuel (Type) Gasoline
Quantity 60 gallons
Road consumption 3.6 mpg
Cross country consumption  
Traverse 27.5° both ways
Speed - Road 45 mph
Speed - Cross Country  
Range - Road 200 miles, 220 miles
Range - Cross Country  
Turning radius 30'
Elevation limits -5° to +15°
Fording depth 2' 8"
Trench crossing  
Vertical obstacle 1'
Climbing ability 30° slope
Suspension (Type) Front: Semielliptic spring
Rear: Vertical volute spring
Wheels each side Front: 1
Rear: 2 sets of articulated four-wheeled bogies
Return rollers each side 1
Tracks (Type) Endless band
Width 12"
Number of links  
Pitch 4"
Tire tread  
Tire size 8.25 x 20
Track centers/tread 63 3/16"
Wheel centers 64.5"
Wheel base 135.5"


  1. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
20th Century American Military History Crucial Site