| M1: General | |||
| Date of first acceptance | 1928 | Total acceptances | 5 |
| Manufacturer | James Cunningham, Son, and Co. | Crew |
|
| M1: Dimensions | |||
| Combat weight | 15,671lbs 7,108.4kg |
Height | 85.6" 217cm |
| Length over tracks | 152.2" 386.6cm |
Gun overhang forward | 0" |
| Width | 70.5" 179cm |
Tread | 58.3" 148cm |
| Ground clearance | 14" 36cm |
Fire height | 73" 185cm |
| Turret ring diameter | ~40" ~100cm |
Ground pressure, grouser penetration only | 8.9psi .62kg/cm² |
| M1: Armament | |||
| Type | Mount | Ammunition | Traverse |
| 37mm Gun M1916 | T1 in turret | 80 rounds | 360° (manual) |
| .30cal M1919 MG | Coaxial to 37mm gun | 3,000 rounds | 360° (manual) |
| Aiming equipment | |||
| Telescopic sight M1918 (tank) for gunner | |||
| M1: Armor | ||
| Assembly | ||
| Riveting | ||
| Hull | ||
| Rolled face-hardened steel | ||
| Location | Thickness | Angle from vertical |
| Driver's hood | .375" .953cm |
13° |
| Middle front | .25" .64cm |
85° |
| Lower front | .375" .953cm |
0° to 30° |
| Sides | .375" .953cm |
0° |
| Rear | .375" .953cm |
0° |
| Top | .25" .64cm |
90° |
| Floor | .25" .64cm |
90° |
| Turret | ||
| Rolled face-hardened steel | ||
| Location | Thickness | Angle from vertical |
| Front | .375" .953cm |
0° |
| Sides | .375" .953cm |
0° |
| Rear | .375" .953cm |
0° |
| Top | .25" .64cm |
75° to 90° |
| M1: Automotive | |
| Engine | Cunningham; 8 cylinder, 4 cycle, vee gasoline | Fuel capacity | 50gal 190L |
| Transmission | Cotta sliding gear, 3 speeds forward, 1 reverse |
| Steering | Clutch-brake; steering levers |
| Brakes | Mechanical |
| M1: Suspension | ||
| Type | Road wheels | Track return rollers |
| Unsprung, link type | 4 bogies/track 2 wheels/bogie |
2/track |
| Drive sprockets | Idlers | Shock absorbers | 31-double-tooth rear drive | Adjustable at front of track | None |
| M1: Track | |||||||
| Single pin, cast steel open shoe with integral grouser | |||||||
| Width | 12" 30cm |
Pitch | 6.5" 17cm |
Shoes/track | 51 | Ground contact length | 72" 180cm |
| M1: Performance | |||
| Max level road speed | 18mph 29kph |
Max trench | 72" 180cm |
| Max grade | 70% | Max vertical obstacle | 20" 51cm |
| Min turning diameter | 20' 6.1m |
Max fording depth | 20" 51cm |
| Cruising range | ~75mi, roads ~120km, roads |
||
The light tank M1 had the engine mounted frontally and the turret at the rear. The driver's position was directly beneath the turret. The M1 did not remain in service for long; it was standardized on 24 January 1928, but this status was revoked on 30 March 1928.
