# M3 Stuart
The **M3 Stuart**, formally Light Tank M3, was an American light tank of World War II, standardized in July 1940 and produced in quantity from March 1941, armed with a 37 mm main gun and supplied under [Lend-Lease](https://www.edgepedia.org/lend-lease) to British and other Allied forces before and after the United States entered the war.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) • [7](https://www.ibiblio.org/hyperwar/NHC/NewPDFs/USArmy/US%20military%20Technical%20and%20Field%20manuals/Standard.Ordnance.Items.Catalog.Vol.1.1944.pdf) British troops nicknamed it "Honey" in tribute to its mechanical reliability, and the name stuck.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank)
| Key fact | Detail |
|---|---|
| Type | Light tank, crew of 4 (commander, gunner, driver, assistant driver)[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) |
| Armament | 37 mm M6 main gun and three .30 caliber machine guns[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) • [2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) |
| Mobility | Maximum speed 36 mph; weight 28,500 pounds (about 12.9 tonnes)[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) • [2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) |
| Production | M3 family total 13,859, all built by American Car and Foundry at Berwick, Pennsylvania, and St. Charles, Missouri[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) • [3](https://usautoindustryworldwartwo.com/Serial%20Numbers/M3-%20series-productionrecords.htm) |
| First combat | With British forces in North Africa, November 1941; with US forces in the Philippines, December 1941[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) |
| Successor | M5, using two Cadillac engines and two automatic transmissions, replaced the M3 in production[4](https://history.army.mil/portals/143/Images/Publications/catalog/10-10.pdf) |
| Longevity | Some countries used the Stuart into the 1980s, and it remained on the active list of the Armed Forces of Paraguay[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) |
## Development and production
The US Army had been developing light tanks since the early 1930s, and a sequence of models with progressively increased armor and firepower led to the M3 series in mid-1940.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) The design was based on the Light Tank M2A4 but used heavier armor and other improvements; for its day it was considered heavily armed and armored, and it provided a high standard of mechanical reliability.[7](https://www.ibiblio.org/hyperwar/NHC/NewPDFs/USArmy/US%20military%20Technical%20and%20Field%20manuals/Standard.Ordnance.Items.Catalog.Vol.1.1944.pdf) Prototypes of what became the Light Tank M3 first appeared in 1933 and were standardized by 1940.[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all)
**One manufacturer.** All production of the M3 series was done by the American Car and Foundry at two plants, in Berwick, Pennsylvania, and [St. Charles, Missouri](https://www.edgepedia.org/st-charles-missouri), with the first tank delivered in March 1941.[3](https://usautoindustryworldwartwo.com/Serial%20Numbers/M3-%20series-productionrecords.htm) • [5](https://tank-afv.com/ww2/US/M3_stuart.php) The M3 was not built by the US auto industry, which was otherwise a major source of wartime vehicles.[3](https://usautoindustryworldwartwo.com/Serial%20Numbers/M3-%20series-productionrecords.htm) Of the base M3, 5,811 were produced, including 1,285 fitted with the Guiberson diesel engine on a British specification; the British designated the gasoline version Stuart Mk I and the diesel variant Stuart Mk III.[5](https://tank-afv.com/ww2/US/M3_stuart.php) Across the whole M3 family, 13,859 tanks were produced.[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all)
## Variants
**M3A1.** Combat experience in the Philippines, where the M3 met the Japanese invasion in December 1941, produced feedback that was incorporated into the M3A1, which began production in May 1942.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) The M3A1 added a gyro stabilizer for the 37 mm main gun and a power traverse for the turret; the power traverse required a basket, or floor, that rotated with the turret, features that made it the first American tank to include them.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) A total of 4,621 M3A1 tanks were built, 4,410 with gasoline engines and 211 with diesel.[6](https://www.usarmymodels.com/AFV%20PHOTOS/M3A1%20STUART/M3A1%20Stuart.html) The M3A1 also dispensed with the sponson machine guns of the M3 and, in later production, replaced the riveted hull with welded construction.[6](https://www.usarmymodels.com/AFV%20PHOTOS/M3A1%20STUART/M3A1%20Stuart.html)
**M3A3 and M5.** The M3A3, which debuted in 1942, featured a fully welded hull, angled front armor, and a better radio compartment, but the M5 soon took its place; the latter, powered by a pair of Cadillac engines paired with twin automatic transmissions, necessitated numerous changes to drawings and specifications.[4](https://history.army.mil/portals/143/Images/Publications/catalog/10-10.pdf) The M5A1 was an improved version of the M3 with a larger hull and improved engine but the same firepower.[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) US factories built more than 22,000 M3 and upgraded M5 tanks during the war.[8](https://www.nationalww2museum.org/visit/museum-campus-guide/kushner-restoration-pavilion/wwii-motor-pool) A 75 mm Howitzer Motor Carriage M8, with an open-top turret, was the only other vehicle in the Stuart family to see service.[9](https://www.benning.army.mil/Armor/eARMOR/content/issues/1990/SEP_OCT/ArmorSeptemberOctober1990web.pdf)
## Combat service
**North Africa and Europe.** The M3 began arriving in North Africa in July 1941 and first saw combat with British forces there in November 1941.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) • [2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) The British found the tank under-gunned but were so pleased with its mechanical performance that they nicknamed it "Honey."[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) The 37 mm gun became steadily less effective as German armor improved; one veteran remarked that "popcorn balls thrown by Little Bo Peep would have been just as effective."
[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) After the 1st [Battalion](https://www.edgepedia.org/battalion), 13th Armored Regiment fought at the [Battle of Kasserine Pass](https://www.edgepedia.org/battle-of-kasserine-pass), the Stuart was relegated to reconnaissance and flank security, and the M3 and M5 continued in European service through the end of the war.[1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) In this shifted role its speed, low maintenance needs, and good visibility remained useful.[10](https://mechanographia.com/tank-light-m3-stuart/)
**The Pacific.** The Stuart proved effective against Japan. Its 37 mm gun worked well against small Japanese tanks and pillboxes, and the small tank was far more practical for jungle warfare in [New Guinea](https://www.edgepedia.org/new-guinea) and the Solomons than the much larger and heavier Sherman that replaced it in late 1943.[8](https://www.nationalww2museum.org/visit/museum-campus-guide/kushner-restoration-pavilion/wwii-motor-pool) • [1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank) Australian troops used M3 Stuarts against the Japanese at Cape Endaiadere, Buna, in New Guinea in December 1942; a battle-damaged hull and turret from that fighting, salvaged in 1973, is displayed at the [Australian War Memorial](https://www.edgepedia.org/australian-war-memorial).[11](https://www.awm.gov.au/collection/C153431)
**Lend-Lease beyond Britain.** Stuarts were shipped to the Soviet Union from the start of the polar convoys in 1942 until April 1943.[12](https://www.nationalww2museum.org/war/articles/lend-lease-eastern-front) The tank was also used by forces of Britain, Australia, Brazil, Canada, France, India, Italy, Japan, the Netherlands, New Zealand, Russia, South Africa, the United States, and [Yugoslavia](https://www.edgepedia.org/yugoslavia).[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all)
## Legacy
The Stuart's combination of mechanical reliability and mobility kept it in service long after it was outclassed as a gun tank. Some countries used it until the 1980s, and it remained on the active list of the [Armed Forces of Paraguay](https://www.edgepedia.org/armed-forces-of-paraguay), which operates M3 and M3A1 variants updated with new engines and machine guns.[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) Surviving examples are preserved and restored at museums including [The Tank Museum](https://www.edgepedia.org/the-tank-museum) at Bovington, which holds an M3 hybrid with an M3 hull and M3A1 turret donated by the [Brazilian Army](https://www.edgepedia.org/brazilian-army) in 1990, and the National WWII Museum in New Orleans.[2](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all) • [1](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank)
## References
1. [M3A1 Stuart Tank, The National WWII Museum, New Orleans](https://www.nationalww2museum.org/visit/museum-campus/us-freedom-pavilion/vehicles-war/m3a1-stuart-tank)
2. [M3A1 Stuart, The Tank Museum, Bovington](https://tankmuseum.org/tank-nuts/tank-collection/m3a1-stuart/?country=all&era=all)
3. [M3-Series Production Records, The American Automobile Industry in World War Two](https://usautoindustryworldwartwo.com/Serial%20Numbers/M3-%20series-productionrecords.htm)
4. [The Ordnance Department: Procurement and Supply, US Army Center of Military History](https://history.army.mil/portals/143/Images/Publications/catalog/10-10.pdf)
5. [M3 Stuart light tanks (1940), tank-afv.com](https://tank-afv.com/ww2/US/M3_stuart.php)
6. [M3A1 Stuart, US Army Models](https://www.usarmymodels.com/AFV%20PHOTOS/M3A1%20STUART/M3A1%20Stuart.html)
7. [Light Tank M3 Series, Standard Ordnance Items Catalog Vol. 1 (1944), HyperWar](https://www.ibiblio.org/hyperwar/NHC/NewPDFs/USArmy/US%20military%20Technical%20and%20Field%20manuals/Standard.Ordnance.Items.Catalog.Vol.1.1944.pdf)
8. [WWII Motor Pool, The National WWII Museum](https://www.nationalww2museum.org/visit/museum-campus-guide/kushner-restoration-pavilion/wwii-motor-pool)
9. [ARMOR Magazine, September-October 1990, US Army Armor School](https://www.benning.army.mil/Armor/eARMOR/content/issues/1990/SEP_OCT/ArmorSeptemberOctober1990web.pdf)
10. [Tank, Light, M3 (Stuart), Mechanographia](https://mechanographia.com/tank-light-m3-stuart/)
11. [Upper Hull and Turret Section: M3 Stuart Tank, Australian War Memorial](https://www.awm.gov.au/collection/C153431)
12. [Lend-Lease to the Eastern Front, The National WWII Museum](https://www.nationalww2museum.org/war/articles/lend-lease-eastern-front)
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*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Tanks and armored fighting vehicles › Specific tank models › World War II era tanks*
*Initially written Sep 17, 2026 · Reviewed: Oct 15, 2026 · Edited: Oct 15, 2026 · Last review: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license