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Medium Tank M3 Lee1-10
M3: General
Date of first acceptance June 1941 Total acceptances 4724
Manufacturers
  • Rock Island Arsenal
  • Detroit Tank Arsenal
  • American Locomotive Co.
Crew
7 men:
  • Commander in turret left rear
  • 37mm gunner in turret left rear
  • 37mm loader in turret right center
  • 75mm gunner in hull right front
  • 75mm loader in hull right center
  • Driver in hull front center
  • Radio operator in hull center
M3: Dimensions
Combat weight with T48 or T51 tracks 61,500lbs
27,900kg
Height over cupola 123"
312cm
Length without gun, without sandshields 222"
564cm
Gun overhang forward with 75mm gun M3 19"
48cm
Width over side doors 107"
272cm
Tread 83"
211cm
Ground clearance 17"
43cm
Fire height, 75mm gun 69"
175cm
Turret ring diameter 54.5"
138cm
Ground pressure, zero penetration 12.6psi
.885kg/cm²
M3: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
75mm Gun M2 or M3 M1 in hull right front 50 rounds 30°
(15° left and right;
manual)
-- +20° to -9°
(manual)
37mm Gun M5 or M6 M24 in turret 178 rounds 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
.30cal M1919A4 MG Turret cupola 9200 rounds 360°
(manual)
-- Manual
.30cal M1919A4 MG Coaxial to 37mm gun 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
Two .30cal M1919A4 MG Fixed in hull left front --
Stabilizer
Elevation only (75mm and 37mm guns)
M3: Armor
Assembly
Riveting
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front 2.0"
5.1cm
30°
Middle front 1.5"
3.8cm
53°
Lower front 2.0"
5.1cm
0° to 45°
Sides 1.5"
3.8cm
Rear 1.5"
3.8cm
0° to 10°
Top .50"
1.3cm
83° to 90°
Front floor 1.0"
2.5cm
90°
Rear floor .50"
1.3cm
90°
Turret
Cast homogeneous steel
Location Thickness Angle from vertical
Front 2.0"
5.1cm
47°
Sides 2.0"
5.1cm
Rear 2.0"
5.1cm
Top .875"
2.22cm
90°
M3: Automotive
Engine Wright (Continental) R975 EC2; 9 cylinder, 4 cycle, radial gasoline
Horsepower Net: 340@2400rpm
Gross: 400@2400rpm
Torque Net: 800 ft-lb@1800rpm
Gross: 890 ft-lb@1800rpm
Fuel capacity 175gal
662L
Transmission Synchromesh, 5 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M3: Suspension
Type Road wheels Track return rollers
Vertical volute spring 3 bogies/track;
2 wheels/bogie
1 on top of each bogie
Drive sprockets Idlers Shock absorbers
13-tooth front drive Adjustable at rear of track None
M3: Track
T41
Outside guide, double pin, smooth, rubber
Width 16.0"
40.6cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T48
Outside guide, double pin, chevron, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T49
Outside guide, double pin, parallel bar, steel
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T51
Outside guide, double pin, smooth, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
M3: Performance
Max level road speed 21mph sustained
24mph dash
34kph sustained
39kph dash
Max trench 90"
230cm
Max grade 60% Max vertical obstacle 24"
61cm
Min turning diameter 62'
19m
Max fording depth 40"
100cm
Cruising range ~120mi, roads
~190km, roads


The medium tank M3 was based on the medium tank M2, utilizing its suspension, power train, and other mechanical parts. The British version of the M3 was dubbed cruiser tank Grant I, and differed in some details. The main armament of the tank, the 75mm gun, was mounted in the right-hand sponson since no turret capable of holding a 75mm gun had yet been designed in the US. The M3 medium tank was an interim design until the medium tank M4 could enter production with its 75mm gun turret. The M3 was called Lee I by the British.

Late-production tanks had the doors originally on each hull side eliminated in favor of a floor escape hatch, and one of the driver's fixed machine guns was deleted as well; the resulting hole was filled with a steel plug. The crew of late M3s was reduced to six men when the driver also took over the role of radio operator. Very late production M3s had new heavy-duty suspension bogies with 8" (20cm) instead of 7" (18cm) volute springs, and the track return rollers were moved to the rear of the new bogies. Late vehicles also had the 75mm gun periscope replaced with a telescopic sight, and another periscope was installed above the driver's position. The armament of late-model tanks included the M3 75mm gun and M6 37mm gun.

Tanks with stabilization systems installed can be differentiated from those without by the presence of a cylindrical counterweight under the 37mm gun, and a counterweight at the end of the 75mm gun barrel if the tank is armed with the shorter 75mm gun M2. The longer 75mm gun M3 did not require a counterweight to be compatible with the gyrostabilizer.

The differences in the 37mm and 75mm guns are as follows: The 37mm gun M5 was 6" (15cm) shorter than the M6, and the M5 had a manually-operated breechblock instead of the M6's semiautomatic breechblock. The 75mm gun M2 had a shorter barrel than the M3 and had a vertical breechblock to the M3's horizontal breechblock. Otherwise, the 75mm guns were identical.


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Medium Tank M3A1 Lee1-8,11
M3A1: General
Date of first acceptance January 1942 Total acceptances 300
Manufacturer American Locomotive Co. Crew
7 men:
  • Commander in turret left rear
  • 37mm gunner in turret left rear
  • 37mm loader in turret right center
  • 75mm gunner in hull right front
  • 75mm loader in hull right center
  • Driver in hull front center
  • Radio operator in hull center
M3A1: Dimensions
Combat weight with T48 or T51 tracks 63,000lbs
28,600kg
Height over cupola 123"
312cm
Length without gun, without sandshields 222"
564cm
Gun overhang forward with 75mm gun M3 19"
48cm
Width over side doors 107"
272cm
Tread 83"
211cm
Ground clearance 17"
43cm
Fire height, 75mm gun 69"
175cm
Turret ring diameter 54.5"
138cm
Ground pressure, zero penetration 12.9psi
.906kg/cm²
M3A1: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
75mm Gun M2 or M3 M1 in hull right front 50 rounds 30°
(15° left and right;
manual)
-- +20° to -9°
(manual)
37mm Gun M5 or M6 M24 in turret 178 rounds 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
.30cal M1919A4 MG Turret cupola 9200 rounds 360°
(manual)
-- Manual
.30cal M1919A4 MG Coaxial to 37mm gun 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
Two .30cal M1919A4 MG Fixed in hull left front --
Stabilizer
Elevation only (75mm and 37mm guns)
M3A1: Armor
Assembly
Riveting
Hull
Upper cast, lower rolled homogeneous steel
Location Thickness Angle from vertical
Upper front 2.0"
5.1cm
30°
Middle front 1.5"
3.8cm
53°
Lower front 2.0"
5.1cm
0° to 45°
Sides 1.5"
3.8cm
Rear 1.5"
3.8cm
0° to 10°
Top .50"
1.3cm
83° to 90°
Front floor 1.0"
2.5cm
90°
Rear floor .50"
1.3cm
90°
Turret
Cast homogeneous steel
Location Thickness Angle from vertical
Front 2.0"
5.1cm
47°
Sides 2.0"
5.1cm
Rear 2.0"
5.1cm
Top .875"
2.22cm
90°
M3A1: Automotive
Engine Wright (Continental) R975 EC2; 9 cylinder, 4 cycle, radial gasoline
Horsepower Net: 340@2400rpm
Gross: 400@2400rpm
Torque Net: 800 ft-lb@1800rpm
Gross: 890 ft-lb@1800rpm
Fuel capacity 175gal
662L
Transmission Synchromesh, 5 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M3A1: Suspension
Type Road wheels Track return rollers
Vertical volute spring 3 bogies/track;
2 wheels/bogie
1 on top of each bogie
Drive sprockets Idlers Shock absorbers
13-tooth front drive Adjustable at rear of track None
M3A1: Track
T41
Outside guide, double pin, smooth, rubber
Width 16.0"
40.6cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T48
Outside guide, double pin, chevron, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T49
Outside guide, double pin, parallel bar, steel
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T51
Outside guide, double pin, smooth, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
M3A1: Performance
Max level road speed 21mph sustained
24mph dash
34kph sustained
39kph dash
Max trench 90"
230cm
Max grade 60% Max vertical obstacle 24"
61cm
Min turning diameter 62'
19m
Max fording depth 40"
100cm
Cruising range ~120mi, roads
~190km, roads


Except for the cast upper hull, the M3A1 was largely identical to the M3. The door in the right side hull roof was placed on the rear slope of the 75mm gun sponson. This hatch was hinged from the front on early vehicles, and opened to the rear on later models. The British referred to M3A1 as Lee II. Twenty-eight M3A1s were completed with the Guiberson T-1400-2 diesel engine, and were designated as M3A1(diesel).

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Medium Tank M3A2 Lee1-4,6-8,12
M3A2: General
Date of first acceptance January 1942 Total acceptances 12
Manufacturers
  • Rock Island Arsenal
  • Baldwin Locomotive Works
Crew
7 men:
  • Commander in turret left rear
  • 37mm gunner in turret left rear
  • 37mm loader in turret right center
  • 75mm gunner in hull right front
  • 75mm loader in hull right center
  • Driver in hull front center
  • Radio operator in hull center
M3A2: Dimensions
Combat weight with T48 or T51 tracks 60,400lbs
27,400kg
Height over cupola 123"
312cm
Length without gun, without sandshields 222"
564cm
Gun overhang forward with 75mm gun M3 19"
48cm
Width over side doors 107"
272cm
Tread 83"
211cm
Ground clearance 17"
43cm
Fire height, 75mm gun 69"
175cm
Turret ring diameter 54.5"
138cm
Ground pressure, zero penetration 12.4psi
.870kg/cm²
M3A2: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
75mm Gun M2 or M3 M1 in hull right front 50 rounds 30°
(15° left and right;
manual)
-- +20° to -9°
(manual)
37mm Gun M5 or M6 M24 in turret 178 rounds 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
.30cal M1919A4 MG Turret cupola 9200 rounds 360°
(manual)
-- Manual
.30cal M1919A4 MG Coaxial to 37mm gun 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
Two .30cal M1919A4 MG Fixed in hull left front --
Stabilizer
Elevation only (75mm and 37mm guns)
M3A2: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front 2.0"
5.1cm
30°
Middle front 1.5"
3.8cm
53°
Lower front 2.0"
5.1cm
0° to 45°
Sides 1.5"
3.8cm
Rear 1.5"
3.8cm
0° to 10°
Top .50"
1.3cm
83° to 90°
Front floor 1.0"
2.5cm
90°
Rear floor .50"
1.3cm
90°
Turret
Cast homogeneous steel
Location Thickness Angle from vertical
Front 2.0"
5.1cm
47°
Sides 2.0"
5.1cm
Rear 2.0"
5.1cm
Top .875"
2.22cm
90°
M3A2: Automotive
Engine Wright (Continental) R975 EC2; 9 cylinder, 4 cycle, radial gasoline
Horsepower Net: 340@2400rpm
Gross: 400@2400rpm
Torque Net: 800 ft-lb@1800rpm
Gross: 890 ft-lb@1800rpm
Fuel capacity 175gal
662L
Transmission Synchromesh, 5 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M3A2: Suspension
Type Road wheels Track return rollers
Vertical volute spring 3 bogies/track;
2 wheels/bogie
1 on top of each bogie
Drive sprockets Idlers Shock absorbers
13-tooth front drive Adjustable at rear of track None
M3A2: Track
T41
Outside guide, double pin, smooth, rubber
Width 16.0"
40.6cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T48
Outside guide, double pin, chevron, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T49
Outside guide, double pin, parallel bar, steel
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T51
Outside guide, double pin, smooth, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
M3A2: Performance
Max level road speed 21mph sustained
24mph dash
34kph sustained
39kph dash
Max trench 90"
230cm
Max grade 60% Max vertical obstacle 24"
61cm
Min turning diameter 62'
19m
Max fording depth 40"
100cm
Cruising range ~120mi, roads
~190km, roads


The M3A2 was identical to the M3 except for the M3A2's welded hull. The British designation for M3A2 was Lee III.

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Medium Tank M3A5 Lee1-7,12-13
M3A5: General
Date of first acceptance January 1942 Total acceptances 591
Manufacturer Baldwin Locomotive Works Crew
7 men:
  • Commander in turret left rear
  • 37mm gunner in turret left rear
  • 37mm loader in turret right center
  • 75mm gunner in hull right front
  • 75mm loader in hull right center
  • Driver in hull front center
  • Radio operator in hull center
M3A5: Dimensions
Combat weight with T48 or T51 tracks 64,000lbs
29,000kg
Height over cupola 123"
312cm
Length without gun, without sandshields 222"
564cm
Gun overhang forward with 75mm gun M3 19"
48cm
Width over side doors 107"
272cm
Tread 83"
211cm
Ground clearance 17"
43cm
Fire height, 75mm gun 69"
175cm
Turret ring diameter 54.5"
138cm
Ground pressure, zero penetration 13.1psi
.920kg/cm²
M3A5: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
75mm Gun M2 or M3 M1 in hull right front 50 rounds 30°
(15° left and right;
manual)
-- +20° to -9°
(manual)
37mm Gun M5 or M6 M24 in turret 178 rounds 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
.30cal M1919A4 MG Turret cupola 9200 rounds 360°
(manual)
-- Manual
.30cal M1919A4 MG Coaxial to 37mm gun 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
Two .30cal M1919A4 MG Fixed in hull left front --
Stabilizer
Elevation only (75mm and 37mm guns)
M3A5: Armor
Assembly
Riveting
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front 2.0"
5.1cm
30°
Middle front 1.5"
3.8cm
53°
Lower front 2.0"
5.1cm
0° to 45°
Sides 1.5"
3.8cm
Rear 1.5"
3.8cm
0° to 10°
Top .50"
1.3cm
83° to 90°
Front floor 1.0"
2.5cm
90°
Rear floor .50"
1.3cm
90°
Turret
Cast homogeneous steel
Location Thickness Angle from vertical
Front 2.0"
5.1cm
47°
Sides 2.0"
5.1cm
Rear 2.0"
5.1cm
Top .875"
2.22cm
90°
M3A5: Automotive
Engine General Motors 6046; 12 cylinder (6/engine), 2 cycle, twin in-line diesel
Horsepower Net: 375@2100 crankshaft rpm
Gross: 410@2900 propellor shaft rpm
Torque Net: 1000 ft-lb@1400 crankshaft rpm
Gross: 885 ft-lb@1900 propellor shaft rpm
Fuel capacity 148gal
560L
Transmission Synchromesh, 5 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M3A5: Suspension
Type Road wheels Track return rollers
Vertical volute spring 3 bogies/track;
2 wheels/bogie
1 on top of each bogie
Drive sprockets Idlers Shock absorbers
13-tooth front drive Adjustable at rear of track None
M3A5: Track
T41
Outside guide, double pin, smooth, rubber
Width 16.0"
40.6cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T48
Outside guide, double pin, chevron, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T49
Outside guide, double pin, parallel bar, steel
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T51
Outside guide, double pin, smooth, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
M3A5: Performance
Max level road speed 25 sustained
30mph dash
40kph sustained
48kph dash
Max trench 90"
230cm
Max grade 60% Max vertical obstacle 24"
61cm
Min turning diameter 62'
19m
Max fording depth 40"
100cm
Cruising range ~150mi, roads
~240km, roads


The radial gasoline engines of previous medium tanks M3 were also needed for training aircraft, and an engine shortage was foreseen. To help with the situation, the General Motors 6046 was created. The GM 6046 diesel engine was a pair of GM 6-71 truck engines, each of which could be operated independently if so required. The engines were meshed together on a helical gear which was mounted on a propellor shaft connecting to the tank's transmission. The side and rear armor plates on diesel-engined M3s extended below the level of the track return run, and the rear hull plate was sloped to accomodate the larger diesel engine. The engine compartment was accessed through a single lower rear plate instead of the twin doors on the radial-engined M3s. An exhaust deflector was installed to reduce the dust signature of the tank, and two armored doors with air intake louvres were installed over the tank's engine compartment. The M3A5 was borne out of the dire shortage of tanks which necessitated the installation of the diesel engine in riveted-hull tanks as well as welded-hull vehicles. M3A5 was referred to by the British as Grant II.

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Medium Tank M3A3 Lee1-7,13-14
M3A3: General
Date of first acceptance March 1942 Total acceptances 322
Manufacturer Baldwin Locomotive Works Crew
7 men:
  • Commander in turret left rear
  • 37mm gunner in turret left rear
  • 37mm loader in turret right center
  • 75mm gunner in hull right front
  • 75mm loader in hull right center
  • Driver in hull front center
  • Radio operator in hull center
M3A3: Dimensions
Combat weight with T48 or T51 tracks 63,000lbs
28,600kg
Height over cupola 123"
312cm
Length without gun, without sandshields 222"
564cm
Gun overhang forward with 75mm gun M3 19"
48cm
Width over side doors 107"
272cm
Tread 83"
211cm
Ground clearance 17"
43cm
Fire height, 75mm gun 69"
175cm
Turret ring diameter 54.5"
138cm
Ground pressure, zero penetration 12.9psi
.906kg/cm²
M3A3: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
75mm Gun M2 or M3 M1 in hull right front 50 rounds 30°
(15° left and right;
manual)
-- +20° to -9°
(manual)
37mm Gun M5 or M6 M24 in turret 178 rounds 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
.30cal M1919A4 MG Turret cupola 9200 rounds 360°
(manual)
-- Manual
.30cal M1919A4 MG Coaxial to 37mm gun 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
Two .30cal M1919A4 MG Fixed in hull left front --
Stabilizer
Elevation only (75mm and 37mm guns)
M3A3: Armor
Assembly
Welding
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front 2.0"
5.1cm
30°
Middle front 1.5"
3.8cm
53°
Lower front 2.0"
5.1cm
0° to 45°
Sides 1.5"
3.8cm
Rear 1.5"
3.8cm
0° to 10°
Top .50"
1.3cm
83° to 90°
Front floor 1.0"
2.5cm
90°
Rear floor .50"
1.3cm
90°
Turret
Cast homogeneous steel
Location Thickness Angle from vertical
Front 2.0"
5.1cm
47°
Sides 2.0"
5.1cm
Rear 2.0"
5.1cm
Top .875"
2.22cm
90°
M3A3: Automotive
Engine General Motors 6046; 12 cylinder (6/engine), 2 cycle, twin in-line diesel
Horsepower Net: 375@2100 crankshaft rpm
Gross: 410@2900 propellor shaft rpm
Torque Net: 1000 ft-lb@1400 crankshaft rpm
Gross: 885 ft-lb@1900 propellor shaft rpm
Fuel capacity 148gal
560L
Transmission Synchromesh, 5 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M3A3: Suspension
Type Road wheels Track return rollers
Vertical volute spring 3 bogies/track;
2 wheels/bogie
1 on top of each bogie
Drive sprockets Idlers Shock absorbers
13-tooth front drive Adjustable at rear of track None
M3A3: Track
T41
Outside guide, double pin, smooth, rubber
Width 16.0"
40.6cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T48
Outside guide, double pin, chevron, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T49
Outside guide, double pin, parallel bar, steel
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
T51
Outside guide, double pin, smooth, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 79 Ground contact length 147"
373cm
M3A3: Performance
Max level road speed 25 sustained
30mph dash
40kph sustained
48kph dash
Max trench 90"
230cm
Max grade 60% Max vertical obstacle 24"
61cm
Min turning diameter 62'
19m
Max fording depth 36"
91cm
Cruising range ~150mi, roads
~240km, roads


The M3A3 was a welded-hull Lee with the GM 6046 diesel engine. The British called diesel-engined M3A3s Lee V and Continental-engined M3A3s Lee IV. This may only be a paper designation, as no M3A3s were produced with the Continental R975. The British, trying to keep pace with the plethora of tank types emerging from the US, reserved designations for expected production models. Lee IV is apparently just such a designation that was reserved but whose vehicle never saw production.

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Medium Tank M3A4 Lee1-7,15-16
M3A4: General
Date of first acceptance June 1942 Total acceptances 109
Manufacturer Detroit Tank Arsenal Crew
7 men:
  • Commander in turret left rear
  • 37mm gunner in turret left rear
  • 37mm loader in turret right center
  • 75mm gunner in hull right front
  • 75mm loader in hull right center
  • Driver in hull front center
  • Radio operator in hull center
M3A4: Dimensions
Combat weight with T48 or T51 tracks 64,000lbs
29,000kg
Height over cupola 123"
312cm
Length without gun, without sandshields 242"
615cm
Gun overhang forward with 75mm gun M3 19"
48cm
Width without side doors 104"
264cm
Tread 83"
211cm
Ground clearance 16"
41cm
Fire height, 75mm gun 69"
175cm
Turret ring diameter 54.5"
138cm
Ground pressure, zero penetration 12.1psi
.849kg/cm²
M3A4: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation
75mm Gun M2 or M3 M1 in hull right front 50 rounds 30°
(15° left and right;
manual)
-- +20° to -9°
(manual)
37mm Gun M5 or M6 M24 in turret 178 rounds 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
.30cal M1919A4 MG Turret cupola 9200 rounds 360°
(manual)
-- Manual
.30cal M1919A4 MG Coaxial to 37mm gun 360°
(manual and hydraulic)
18°/sec +60° to -7°
(manual)
Two .30cal M1919A4 MG Fixed in hull left front --
Stabilizer
Elevation only (75mm and 37mm guns)
M3A4: Armor
Assembly
Riveting
Hull
Rolled homogeneous steel
Location Thickness Angle from vertical
Upper front 2.0"
5.1cm
30°
Middle front 1.5"
3.8cm
53°
Lower front 2.0"
5.1cm
0° to 45°
Sides 1.5"
3.8cm
Rear 1.5"
3.8cm
0° to 20°
Top .50"
1.3cm
83° to 90°
Front floor 1.0"
2.5cm
90°
Rear floor .50"
1.3cm
90°
Turret
Cast homogeneous steel
Location Thickness Angle from vertical
Front 2.0"
5.1cm
47°
Sides 2.0"
5.1cm
Rear 2.0"
5.1cm
Top .875"
2.22cm
90°
M3A4: Automotive
Engine Chrysler A57; 30 cylinder, 4 cycle, multibank gasoline
Horsepower Net: 370@2400 propellor shaft rpm
Gross: 425@2850 crankshaft rpm
Torque Net: 1020 ft-lb@1200 propellor shaft rpm
Gross: 1060 ft-lb@1400 crankshaft rpm
Fuel capacity 160gal
660L
Transmission Synchromesh, 5 speeds forward, 1 reverse
Steering Controlled differential, steering levers
Brakes Mechanical, external contracting
M3A4: Suspension
Type Road wheels Track return rollers
Vertical volute spring 3 bogies/track;
2 wheels/bogie
1 on top of each bogie
Drive sprockets Idlers Shock absorbers
13-tooth front drive Adjustable at rear of track None
M3A4: Track
T41
Outside guide, double pin, smooth, rubber
Width 16.0"
40.6cm
Pitch 6"
15cm
Shoes/track 83 Ground contact length 160"
406cm
T48
Outside guide, double pin, chevron, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 83 Ground contact length 160"
406cm
T49
Outside guide, double pin, parallel bar, steel
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 83 Ground contact length 160"
406cm
T51
Outside guide, double pin, smooth, rubber
Width 16.56"
42.06cm
Pitch 6"
15cm
Shoes/track 83 Ground contact length 160"
406cm
M3A4: Performance
Max level road speed 20mph sustained
25mph dash
32kph sustained
40kph dash
Max trench 96"
240cm
Max grade 60% Max vertical obstacle 24"
61cm
Min turning diameter 70'
21m
Max fording depth 40"
100cm
Cruising range ~100mi, roads
~160km, roads


The M3A4's A57 engine was actually five Chrysler automobile engines geared to run as a single motor, and was devised to help alleviate the shortage of tank engines. The size of this conglomeration required extending the hull of the M3A4. There is a distinctive space between the suspension bogies of M3A4s which is about 6" (15cm) longer than that of other M3s. Bulges in the engine compartment floor and roof accomodated the A57's fan and radiator, respectively. M3A4 was called Lee VI by the British.

The A57 was comprised of five L-head engines, each having its own crankshaft, pistons, camshaft, valves, manifold, carburetor, and distributor. They were assembled to a common crankcase. Each of the five engine crankshafts spun a drive gear which drove a larger gear that was keyed to the power unit driven gear shaft. This shaft drove the engine clutch.


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References

  1. Hunnicutt, R.P. Sherman: A History of the American Medium Tank. Navato, CA: Presidio Press, 1994.
    Reprinted with permission from Sherman, R.P. Hunnicutt ©1994, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.

  2. FM 23-81 37-mm Gun, Tank, M6 (Mounted in Tanks). Washington, DC: War Dept., 2 Nov 1942.

  3. FM 23-95 75-mm Tank Gun M2 (Mounted in Medium Tank M3). Washington, DC: War Dept., 4 May 1942.

  4. Chamberlain, Peter, and Chris Ellis. British and American Tanks of World War Two. Frome, England: Cassell & Co., 2000.

  5. AGF Board No. 2. Development of Armored Vehicles, volume 1: Tanks. 1947.

  6. Miller, David. The Illustrated Directory of Tanks of the World. Osceola, WI: MBI Publishing Co., 2000.

  7. Siemers, Cary. "USA's M3, M3A1, M3A2, M3A3, M3A4, M3A5 Medium Tanks." World War II Tanks & Vehicles and Advanced Squad Leader. 25 Nov 2000. 10 Jan 2001 <http://www.shadowsfolly.com/WWII/USA/MediumTankM3.htm>.

  8. TM 9-750 Ordnance Maintenance--Medium Tanks M3, M3A1, and M3A2. Washington, DC: War Department, 9 May 1942.

  9. TM 9-1752 Ordnance Maintenance--Auxiliary Generator (Homelite Model HRH-28) for Medium Tanks M3. Washington, DC: War Department, 20 Mar 1942.

  10. Zuljan, Ralph. "M3 Lee." Second World War Armor. 16 Mar 2000. 10 Jan 2001 <http://www.onwar.com/tanks/usa/fm3med.htm>. Second World War Armor

  11. ---. "M3A1 Lee." Second World War Armor. 16 Mar 2000. 10 Jan 2001 <http://www.onwar.com/tanks/usa/fm3a1med.htm>. Second World War Armor

  12. Tank Data, vol. 2. Aberdeen Proving Ground, MD: US Army Ordnance School, Jul 1958.

  13. TM 9-1750G Ordnance Maintenance--General Motors Twin Diesel 6-71 Power Plant for Medium Tanks M3A3, M3A5, and M4A2. Washington, DC: War Department, 1 September 1942.

  14. Zuljan, Ralph. "M3A3 Lee." Second World War Armor. 16 Mar 2000. 10 Jan 2001 <http://www.onwar.com/tanks/usa/fm3a3med.htm>. Second World War Armor

  15. ---. "M3A4 Lee." Second World War Armor. 16 Mar 2000. 10 Jan 2001 <http://www.onwar.com/tanks/usa/fm3a4med.htm>. Second World War Armor

  16. TM 9-1750F Ordnance Maintenance--Power Unit for Medium Tanks M3A4 and M4A4. Washington, DC: War Department, 6 April 1943.



Last updated 23 Apr 2014.

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