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United States' T1 medium tank


T1 Medium Tank :
United States' T1 Medium Tank
Aberdeen Tank Museum


Design began in 1924 and production in 1925 at Rock Island. It wasn't ready for testing until May 1927. Testing was completed in April 1932. In 1928 it was recommended to standardize it as the Medium Tank M1, but the War Department changed its mind and it became just a test vehicle.

Had the Packard engine.

Used only for testing.


  • T1 Medium Tank:
    • Production: 1925
    • Manufacturer: Rock Island Arsenal


  • T1E1 Medium Tank: Had the Liberty engine installed and tested ventilation methods. It was rather long with a low profile hull. Its turret was mounted forward with a commanders cupola on top. It had armor protecting most of the running gear.


  T1 Medium Tank
Crew 4
Physical Characteristics  
Weight 19,912 kg
19.6 tons, 22 tons
Length 21' 6"
6.55 m
Height 9' 4.5", 9' 5", 9' 5.5", 9' 7.5"
2.88 m
Width 8'
2.44 m
Width over tracks  
Ground clearance 22"
Ground contact length  
Ground pressure  
Turret ring diameter  
Main 1: 57 mm
1: 57 mm (6 pounder)
OR 1: 75 mm
MG 2: 7.62 mm MG
2: MG
MG - coaxial 1: .30 cal M1919A2 MG
MG - cupola 1: .30 cal M1919A2 MG
Side arms  
Main 131
MG 4,200
Side arms  
Armor Thickness (mm) 9.5, 25
3/8" - 1"
Hull Front, Upper 1"@0°
Hull Front, Lower  
Hull Sides, Upper 0.375"@0°
Hull Sides, Lower  
Hull Rear 0.375"@0°
Hull Top  
Hull Bottom  
Turret Front 1"@0°
Turret Sides 1"@0°
Turret Rear  
Turret Top  
Engine (Make / Model) Liberty
Bore / stroke  
Cooling Water
Cylinders Packard: 8
Liberty: V-12
Net HP Packard: 200
Liberty: 338
Power to weight ratio  
Compression ratio  
Transmission (Type) Planetary
4 forward, 1 reverse
Steering Controlled differential
Steering ratio  
Electrical system  
Fuel (Type) Gasoline
Quantity 95 gallons
Road consumption  
Cross country consumption  
Traverse 360°, hand
Speed - Road 11.3 mph
Liberty: 14 mph, 25 mph, 22.5 kph, 40 kph
Packard: 14 mph, 22.5 kph
Speed - Cross Country  
Range - Road 50 miles
Liberty: 35 miles, 56 km
Range - Cross Country  
Turning radius  
Elevation limits  
Fording depth 2'
Trench crossing 8'
Vertical obstacle 2' 7"
Climbing ability 35° slope
Suspension (Type) Vertical coil springs
Wheels each side 2 articulated bogies of 4 wheels each
Return rollers each side  
Tracks (Type) Steel
Width 18"
Number of links  
Pitch 8 1/8"
Tire tread  
Track centers/tread  


  1. The Encyclopedia of Tanks and Armored Fighting Vehicles - The Comprehensive Guide to Over 900 Armored Fighting Vehicles From 1915 to the Present Day, General Editor: Christopher F. Foss, 2002
  2. Tanks of the World, 1915-1945, Peter Chamberlain, Chris Ellis, 1972
  3. Tanks of World War II, Duncan Crow, 1979
  4. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
  5. World War I and II Tanks, George Forty, 2012
20th Century American Military History Crucial Site