M103

M103

T32E1

T95E1

M103

T32E1

T95E1

USA

V Rank

Battle rating:

AB	RB	SB
7.7	7.7	7.7

Class:

Heavy tank

Research:105 000

Purchase:300 000

Show in game

Description

During the Berlin Victory Parade of 1945, American and British representatives witnessed the debut of the Soviet IS-3 heavy tank. Concerned about how protected the IS-3 may be against Allied tanks of the time, the Americans began considering a tank design with the firepower capable of tackling the tank. By 1948, the new tank project began as the T43, utilizing American experience developing heavy tanks during World War II. Development of the tank expedited when the Korean War started, showcasing the urgent need for well-armed tanks to counter Soviet ones. As such, the T43 tanks began production even before testing was fully completed, resulting in a lengthy period of rebuilds as faults were discovered and incorporated into the design. Ultimately, 300 T43 and T43E1s were produced and standardized as the M103, with 80 going to the US Army and 220 going to the US Marine Corps. The heavy tanks remained in service until 1974.

Introduced alongside the American ground tech tree in Update 1.45 "Steel Generals", the M103 is armed with a monstrous 120 mm gun. Thanks to its powerful 120 mm gun with HEAT rounds, the tank can engage any target it encounters. However, the entire gameplay with the M103 revolves around its gun, as its decent armour is more of a bonus than an advantage, given that many opponents have HEAT and APDS rounds capable of penetrating its frontal armour without much difficulty. In such situations, the tank's rounded armour shapes with varying thickness often lead to enemy shots ricocheting. Furthermore, the M103's mobility is a weak point, as it struggles to keep up with most allies.

General info

Survivability and armour

Armourfront / side / back

Hull127 / 51 / 38

Turret162 / 159 / 58

Crew5 people

Visibility214 %

Armour type:

• Cast homogeneous armour
• Rolled homogeneous armour (Turret roof)

Armour	Front (Slope angle)	Sides	Rear	Roof
Hull	114.3 mm (55-66°)	50.8 mm Upper 44.44 mm Lower	38 mm	25.4 mm
Turret	127 - 350 mm	76.2 - 93 mm	51 mm	38 mm

Notes:

• Suspension wheels are 20 mm thick and tracks are 30 mm thick.

Hull armour: After the fantastic T32, the M103's armour situation is generally a letdown. Its side armour is nearly nonexistent, same applying to the rear. The M103's turret size was also increased while reducing the armour down from 152 mm to ~85 mm average. But all hope is not lost - the M103's armour design did improve. Unlike its predecessor, it features slopes and angles everywhere, making the M103 a difficult target to destroy from the front. It is also reassuring to know that the frontal chassis is no longer a big weak spot; it is relatively minor and can reliably bounce shots right into the armoured gun mantlet.

Turret armour: The M103's turret fares better. It is designed to take on tanks from the front, as the line of sight thickness exceeds 300 mm on many occasions and where it doesn't the angle will result in bounces. However, this only works when facing straight at the enemy. Any slight angling miscalculation and the Line of Sight armour becomes useless. Penetration on the turret results to catastrophic damage and leaves 2 crews left

Weak spots: The worst part of the M103 is its true weak spots. As mentioned previously, the upper glacis and lower gun mantlet tend to bounce shots into each other, often with deadly results. Furthermore, the bottom turret cheeks are not as well angled as the rest of the turret (~176 mm) and can even be penetrated by the long 88 mm KwK43. The biggest issue present is the abnormally large turret ring. It is visible all around the tank, and with merely 127 mm of armour it attracts many shots. This, in combination with the "shot trap", presents a very deadly scenario: Either the enemy hits the turret ring and incapacitates the entire crew with one APHE shell, or the shell strikes the mantlet/glacis and still does massive damage to either the driver's compartment or the gun breech. Keep the turret ring hidden. Another small weakness is that the M103's belly armour is only 38.1 mm thick, meaning most high-explosive rounds used by the Rank V tanks, HESH, can be splashed under the M103 and actually penetrate it with the explosion alone.

Mobility

Speedforward / back

AB36 / 9 km/h

RB and SB34 / 9 km/h

Number of gears6 forward

2 back

Weight56.7 t

Engine power

AB1 545 hp

RB and SB810 hp

Power-to-weight ratio

AB27.2 hp/t

RB and SB14.3 hp/t

Game Mode	Max Speed (km/h)		Weight (tons)	Engine power (horsepower)		Power-to-weight ratio (hp/ton)
	Forward	Reverse		Stock	Upgraded	Stock	Upgraded
Arcade	36	9	56.7	1,046	1,545	18.45	27.25
Realistic	34	9		716	810	12.63	14.29

Modifications and economy

Repair costBasic → Reference

AB5 600 → 7 067

RB5 931 → 7 484

SB9 446 → 11 920

Total cost of modifications87 700

146 400

Talisman cost2 100

Crew training86 000

Experts300 000

Aces1 200

Research Aces720 000

Reward for battleAB / RB / SB

150 / 200 / 240 %

196 / 196 / 196 %

Modifications

Mobility	Protection	Firepower
Tracks Research: 6 100 Cost: 9 800 230 Suspension Research: 4 100 Cost: 6 600 155 Brake System Research: 4 100 Cost: 6 600 155 Filters Research: 7 600 Cost: 12 000 290 Transmission Research: 7 400 Cost: 12 000 280 Engine Research: 7 400 Cost: 12 000 280	Improved Parts Research: 4 000 Cost: 9 800 230 Improved FPE Research: 2 700 Cost: 6 600 155 Crew Replenishment Research: 7 600 Cost: 12 000 290	Horizontal Drive Research: 6 100 Cost: 9 800 230 Adjustment of Fire Research: 4 100 Cost: 6 600 155 120mm_usa_M469_HEAT_ammo_pack Research: 4 100 Cost: 6 600 155 Elevation Mechanism Research: 7 600 Cost: 12 000 290 120mm_us_M357_Smoke_ammo_pack Research: 7 400 Cost: 12 000 280 Rangefinder Research: 7 400 Cost: 12 000 280

It comes without question that this tank, whose sole defining aspect is its gun, should rely first on parts to keep the barrel smoking. For the second upgrade, which also unlocks other tier two upgrades, "Turret Drive" is recommended. The M103 has no mobility problems and therefore tracks can generally be neglected. However, its second tier unlocks are very useful. "FPE" is beneficial against the fires caused by the engine, but the 380 mm penetration HEAT shells and "Adjustment of Fire" for better accuracy are nothing to ignore. When choosing upgrades, ask this question: Is the normal APBC shot enough? Would I have benefited from being able to put out a fire? Does better accuracy help me to get more targets? Choose wisely. After all these three modules are researched, there is not a lot left. "Elevation Mechanism" is always nice, same for "Engine" and "Transmission".

Armaments

Rangefinder

Reduces the error and increases the maximum measurable distance of the rangefinder

Main armament

120 mm M58 cannon

Ammunition33 rounds

Reloadbasic crew → aces

19.4 → 14.9 s

Vertical guidance-8° / 15°

120 mm M58					Turret rotation speed (°/s)					Reloading rate (seconds)
Mode	Capacity	Vertical	Horizontal	Stabilizer	Stock	Upgraded	Full	Expert	Aced	Stock	Full	Expert	Aced
Arcade	33	-8°/+15°	±180°	N/A	19.4	26.9	32.6	36.1	38.4	19.37	17.14	15.79	14.90
Realistic					14.3	16.8	20.4	22.6	24.0

Ammunition

Penetration statistics
Ammunition	Type of warhead	Penetration @ 0° Angle of Attack (mm)
		10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
M358 shot	APBC	301	298	286	272	258	245
M356 shell	HE	39	39	39	39	39	39
M469 shell	HEATFS	380	380	380	380	380	380

Shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Explosive mass (TNT equivalent) (kg)	Ricochet
							0%	50%	100%
M358 shot	APBC	1,067	23.1	-	-	-	47°	60°	65°
M356 shell	HE	762	22.84	0	0.1	4.65	79°	80°	81°
M469 shell	HEATFS	1,143	23.81	0.05	0.1	2.67	65°	72°	77°

Smoke shell characteristics
Ammunition	Velocity (m/s)	Projectile mass (kg)	Screen radius (m)	Screen deploy time (s)	Screen hold time (s)	Explosive mass (TNT equivalent) (g)
M357	762	22.9	20	5	25	50

Ammo racks

Ammo racks of the M103

Full ammo	Ammo part	1st rack empty	2nd rack empty	3rd rack empty	4th rack empty	Visual discrepancy
33	Projectiles Propellants	12 (+21) 24 (+9)	1 (+32) 14 (+19)	10 (+23)	1 (+32)	No

Machine guns

12.7 mm M2HB machine gun

Ammunition1 000 rounds

Belt capacity200 rounds

Reloadbasic crew → aces

10.4 → 8.0 s

Fire rate575 shots/min

Vertical guidance-10° / 45°

Horizontal guidance-60° / 60°

2 x 7.62 mm M1919A4 machine gun (coaxial)

Ammunition8 000 rounds

Belt capacity250 rounds

Reloadbasic crew → aces

10.4 → 8.0 s

Fire rate500 shots/min

12.7 mm M2HB
Mount	Capacity (Belt)	Fire rate	Vertical	Horizontal
Pintle	1,000 (200)	576	-10°/+45°	±60°

7.62 mm M1919A4
Mount	Capacity (Belt)	Fire rate	Vertical	Horizontal
Coaxial	4,000 (250)	500	N/A	N/A
Coaxial	4,000 (250)	500	N/A	N/A

Usage in battles

Armed with an extremely large 120 mm cannon, the tank boasts superior firepower rivalling many other Rank V vehicles. One thing must be said from the start: this tank is all about the cannon, a Gun tank. This defines the general play style of the tank in both arcade and realistic mode: it is a sniper with the sole role of making the enemy's life as miserable and short-lived as possible. The cannon can compete against the armour of the Maus.

One thing to note is that the M103's play style is very different from its predecessor T32. Aside from the increase in firepower with the 120 mm cannon, the armour on the M103 is actually slightly weaker than the T32. The M103's gun mantlet is still good with ~300 mm line of sight thickness, but any other spot on the tank is weaker. The tank's upper glacis is, however, a major improvement and mostly a ricochet zone. If impacted, the shells usually travel straight into the turret or gun. Against later Soviet and German tanks, the front of the M103 is vulnerable. Even by using the "hull down" tactic as with the T32, the tank can still be penetrated. However, half-turret down will net better results. The sides, as on most US tanks, are still very thin and vulnerable with no major changes from previous models.

However, the armour of the M103 is not all bad; while it is not thick, the way it angles will deflect many shots. A badly placed shot will easily ricochet, or be swallowed by the line of sight thickness. A head-on engagement is the M103's greatest strength as its frontal armour performs similarly to the IS-3's frontal pike nose. Due to the shape of the hull, it being boat-like, you may bounce some low calibre shells off the lower side of your hull.

With range, the advantages of the M103 increase while its disadvantages recede. It is, therefore, the perfect tank for large, open maps like Mozdok and Kursk, where flanking tanks can easily be spotted and dealt with

Tactics

The M103 is best played at medium to long range, making use of its 120 mm cannon to devastate enemies at a long distance. The vehicle's armour is more about slope than actual thickness, so the long distance also helps to mitigate the M103's rather large armour gaps. The tank also has good gun depression, so making use of hills is advised wherever possible. If on a city map, and have no long-range opportunities, stay close to teammates and move up only as warranted. The 120 mm has a fairly long reload, and in close quarters, can get the M103 destroyed during the downtime. As such, keep a back-up plan an escape route handy, as a missed, bounced, or non-lethal shot can leave the M103 exposed to enemy return fire.

The M103 also comes with a smoke round in case it's needed, but unless it's used to cover a pre-engagement advance, it's best to keep it in reserve only. The long reload of the gun can make loading a smoke round a fatal error, should the M103 get caught mid-reload, or worse, have to cease a reload halfway through to load a more suitable round.

Pros and cons

Pros:

• Access to one of the most powerful solid shot rounds in the game
• Decent gun depression
• Very fast turret traverse rate for a heavy tank
• Good mobility for a heavy tank
• Equipped with a rangefinder
• Ballistically well-shaped turret and hull front with thick effective armour
• The APBC shell has good post-penetration, even without explosive filler

Cons:

• Limited ammunition capacity
• Long reload time
• Large and vulnerable turret ring
• Very weak side and rear turret and hull armour
• The cupola is a weak spot
• Uncapped APBC shell performs poorly against sloped armour
• The HEATFS round has poor post-penetration damage

History

Development

The M103 tank was designed to counter the Soviet heavy tanks being produced at the time, namely the IS-3 and the T-10M heavy tanks, which prove rather impervious to Western tank designs such as the M26 Pershing and Centurion. The problem facing the designers at the time was to produce a versatile tank system capable of engaging heavy tanks like the IS-3 and fortifications.

The result of the request for such of a vehicle was the experimental T34 heavy tank, which was a variant of the then-experimental T29 Heavy tank except mounting the much larger 120 mm T53 cannon rather than a 105 mm T5E2 cannon. Further development began on this tank in 1948, where multiple changes were made to the design to fit a more versatile tank system. The end result was the now named T43 Heavy Tank, which began to see the doubt in its success as the Korean War was undergoing at the time that placed the M26 Pershing back in the spotlight. The T43 managed to survive due to an order request of 80 units by the Army to reinforce their depleted armoured forces. The USMC even sought a replacement that could serve for a long period of time and ordered 220 of the vehicle in 1951. Changes were made to the armour protection and the gun was updated to the newer 120 mm T123E1 cannon. After being sent to Aberdeen Proving Ground and approved, it was accepted under the T43E1 designation.

The 120 mm T123E1 cannon (adopted as the M58 gun) was a very large cannon, and the ammo could penetrate about 340 mm of armour up to 1,000 yards. However, the ammo's large size restricted the number that could be held in the tank turret and hull. The design also had a 7.62 mm machine gun and a .50 cal machine gun could be installed on the turret to provide anti-aircraft and anti-personnel fire. The heavy weight of the design at 59 tons caused the Continental AV1790 engine to be insufficient in propelling the tank. Thus, the tank's speed was only about 34 km/h (21 mph). Despite the weight, it was still 10 tons lighter than its predecessors and retained about the same armour protection ratings. The production of the T43E1 tank was designated as the M103 tank and was produced at Chrysler Newark for a total of 300 units produced.

Deployment

The M103 was fielded in Europe in only one battalion in January 1958. The 889th Tank Battalion (later as the 2nd Battalion, 33rd Armor Regiment) was organized to four companies of six platoons each. Each platoon had three M103 heavy tanks for eighteen tanks per company. The United States Marine Corps had one M103 company of about seventeen tanks assigned to each of its three Marine tank battalions in regulars and reserves.

The M103 never saw combat during its service life from 1957 to 1974 and the US Heavy Tank Battalions began to be deactivated around 1963 with the arrival of the M60 Main Battle Tank, which proved to be much better in the long terms compared to the M103. The Marines kept their M103s until they began receiving the M60 tanks to replace them. The removal of the heavy tank units in the US military was the time of turnover from the traditional classification of weight between a tank to the new concept of "main battle tanks" and "airborne vehicles". These ushers in the new age of main battle tanks that can serve in a multi-purpose role against armour and fortifications, starting in the M60 tank, then in its successor the M1 Abrams. The M1 Abrams, while having the same calibre as the M103, was much more powerful due to its new ammunition types and design, and was a statement on the advancement of technology that came in about thirty years difference between the two tank designs.

Today, only a few M103 samples are left intact around America in various bases and museums.

Archive of the in-game description

By the end of the Second World War the M26 Pershing was the primary heavy tank for the American armed forces, though it was later redesignated a medium tank. The US at the same time was working on new heavy tanks, creating the T29, T30, T34, and T32 prototypes. Having released the first T43 pilot model for testing in the summer of 1951, the Detroit Tank Arsenal (Chrysler) introduced a large number of changes to the project. The three subsequent pilot models were designated T43E1s, and worth noting among the significant changes made was the new 120 mm M58 (T123) cannon. New barrel production technology boosted pressure in the chamber as well as initial velocity. The M103's hull and turret were built as intricate, bulky molded pieces with flat welded armour plates on the bottom. The traditional design featured the power unit and transmission in the rear. After testing began in 1953 for the pilot and production models, 98 changes were made to the design. In April 1956 the tank was standardized and sent to production as the 120 mm Gun Full-Tracked Combat Tank M103. In all, 74 of the first 80 T43E1 tanks were updated to meet M103 standards. Operations in Europe uncovered yet another list of problems plaguing the tank: difficult working conditions for the crew, an underpowered engine that overworked both it and the transmission, a barrel that quickly showed wear when frequently firing armour-piercing rounds, and much more. The Marine Corps later ordered a final modernization for the tank: after the basic M60 was accepted, its diesel engine and fire control system were adapted. The new model was designated the M103A2.

Media

Skins

• Skins and camouflages for the M103 from live.warthunder.com.

Videos

M103 - An American Doom Cannon - JustinPlaysYT

See also

• Conqueror - British counterpart of the heavy tanks, using the same gun design.

External links

• [Devblog] Steel Generals: M103 Heavy Tank
• [Devblog] Developers about the M103 Heavy Tank

USA heavy tanks
M4 Jumbo	M4A3E2 · Cobra King · M4A3E2 (76) W
M6	M6A1 · T1E1 · T1E1 (90) · M6A2E1
T26	T26E1-1 · T26E5
T29/30/34	T29 · T30 · T34
T32	T32 · T32E1
M103	M103
Others	T14