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Type 1 (D37812) Riveted octagonal sided with an hexagonal riveted cupola fitted with vision slots. Manual traverse gearbox mounted right front. 37mm Gun M5 in Combination Mount M22 (with limited gun traverse, with fine lay done with shoulder bracket) Telescope sighting. No basket. Pistol ports in turret sides with armor flaps. First produced March 41.
Type 2 (D38976) Same as Type 1 except most armour plates are welded, front turret plate bolted on, riveted cupola
Type 3 (D39273) "Horseshoe" turret, with riveted ellipsoid shaped cupola. Internals same as turret type 1. Pistol ports fitted with new protectoscope covers. The first 160 produced lacked vision slots in the cupolas. Front armor plate bolted on.
Type 4 (D58101) Externally the same as type 3 except without cupola and with the pistol ports moved higher up the turret wall. Internals same as turret type 1 (without basket, without gun stabilizer, hand traverse gearbox mounted at right cheek of turret) except gun is 37mm Gun M6 in Combination Mount M23. Most had limited gun traverse feature, some didn't. Front armor plate now welded on.
Type 5 (D58133) Same as type 4 except with basket, hydraulic power traverse, gun stabilizer, and periscope gunsight, and without limited gun traverse. Traverse gearbox located at turret rear, and pump and motor on turret floor.
Type 6 (D59965) Similar to type 5 with detail changes for M3A3, including a rear bustle, larger hatches, and a new M44 Combination Gun Mount.
Type 1
M3
Stuart I
Early production M3:-
Riveted hull, vision slots in front hull doors, sponson machine guns, gasoline engine.
Turret type 1
Standardised July 1940, enters production March 1941. 100 made.
1
Type 2
M3
Stuart I
Early production M3:-
Same as type 1 but with turret type 2.
Enters production April 1941
 
151
279
721
1366
Type 3
M3 (Diesel)
Stuart II
Early production M3:-
Same as type 2 except for engine (which has longer air inlet hoses that are externally visible). Enters production from June 1941.
 
Type 4
M3
Stuart I
Mid production M3:-
Same as type 2 with grouser storage boxes at rear, and new protectoscope vision slot covers.
Turret type 3.
Produced from October 1941
From December 1941 a lifting hook is added on both sides between the front and rear bogies.
1946
2188
2346
Type 5
M3 (Diesel)
Stuart II
Mid Production M3:-
Same as type 4 except for the engine (which has longer air inlet hoses that are externally visible)..
 
Type 6
M3
Stuart Hybrid
Late production M3:-
Same as type 4 with turret type 4.
Enters production February 1942
3722
Type 7
M3 (Diesel)
Stuart Hybrid (Diesel)
Late production M3:-
Same as type 6 except for the engine
 
Type 8
M3
Stuart Hybrid
Final production M3:-
Same as type 6 but with welded hull.
Produced until August 1942
4927
Type 9
M3 (Diesel)
Stuart Hybrid
Final production M3:-
Same as type 8 except for engine.
 
Type 10
M3A1
Stuart III
Early production M3A1:-
Same as type 4 with auxiliary generator, and blanking plates where sponson machine guns were eliminated. Some fitted with jettisonable fuel tanks.
Turret type 5.
Enters production May 1942
 
Type 11 M3A1(Diesel) Stuart IV
Early production M3A1:-
Same as type 10 except for engine.
 
Type 12
M3A1
Stuart III
Late production M3A1
Same as type 10 but with welded hull.
 
Type 13 M3A1 (Diesel) Stuart IV
Late production M3A1
Same as type 12 except for engine.
5260
Type 14
M3A3
Stuart V
Radical hull change with sloped front and sides. New additional fuel tanks, greater gross weight, new final drive gear ratio.
Turret type 6.