×
Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Pay Scale Military Ranks
HOME
ARMOR
MODERN ARMIES
COUNTRIES
MANUFACTURERS
COMPARE
BY CONFLICT
BY TYPE
BY DECADE
COLD WAR
WORLD WAR 2

IS-1 / JS-1 (Josef Stalin)


Heavy Tank Tracked Combat Vehicle (1943)


Land Systems / Battlefield

1 / 1
Front right side view of the IS-1 Joseph Stalin heavy tank

Jump-to: Specifications

The IS-1 heavy tank were essentially upgraded KV-1 Heavy Tank models.



Authored By: Staff Writer | Last Edited: 05/21/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
The IS-1 was born out of a Soviet Army need for more formidable tracked weapon systems to combat the ever-growing power of German tanks - particularly the newer Panther and Tiger I series appearing by the end of 1942. Initially, the KV-1 and KV-2 series were a limited answer but these ultimately proved too cumbersome in the heat of combat and generally not highly regarded by their crews - particularly the high-profiled KV-2. Both lacked the necessary mobility needed for ever-changing fronts of modern warfare concerning World War 2 and proved expensive to produce in the large numbers required at the time. Therefore, Soviet engineers took to designing the "KV-85" tank as an interim solution while a new initiative was begun under the "KV-13" designation.

The KV-13 program produced the "IS-85" prototype (Objekt 233) and featured a more stout armor layout, thusly increasing protection at all angles, and a heavier main gun armament. The armor was specifically designed to counter the 50mm German anti-tank gun. Her weight limit was restricted to that of the original KV-1 model to help keep the design in check. Primary armament was an 85mm D-5T series main gun fitted to a traversing turret system atop a tracked, low-profile chassis. Six double-tired wheels were afforded to each track side. The drive sprocket was at the rear with the track idler at the front. Three track return rollers assisted the top portion of the tracks. External fuel tank stores were mounted to the rear hull sides. The turret was held well-forward in the design (as in the T-34 medium tank) and sported thick, curved armor facings with some sloping. A commander's cupola was fitted along the rear left side of the turret roof. A 7.62mm DT coaxial machine gun was fitted alongside the main gun and a defensive, rear-facing DT machine gun was mounted along the rear turret wall, offset to the left side of the turret. A further DT machine gun was provided in a bow mounting. Fifty-nine 85mm projectiles were stored throughout the vehicle with 2,520 rounds of 7.62mm machine gun ammunition. Power was provided by a single V2-IS 12-cylinder engine delivering 520 horsepower. Top speed was 23 miles per hour while operational ranges were limited to just 93 miles - both values factoring in ideal conditions at that. The IS-1 was crewed by four personnel to include a driver, tank commander, gunner and loader/machine gunner.

After hurried trials, the IS-85 system was accepted into serial production as the "IS-1" beginning in 1943. This also marked the start of the long line of successful and powerful "Josef Stalin" heavy tanks that would prove critical in the latter war years and even well into the Cold War. The Soviet need for capable heavy tanks was such that the KV-1 , KV-2 and KV-85 types continued to fight on through to the end of the war while the IS-1 lineage itself evolved as the war progressed.

The IS-1 was inevitably (and quickly) replaced by the more well-known IS-2 series and its 122mm A-19 series main guns. The IS-3 then appeared in late 1944 as an upgraded IS-2. Only 200 examples of the IS-4 followed and there was no IS-5 design. Instead, the IS-6 began an abandoned design project as did the IS-7. The line culminated in the Cold War-era IS-10 model, which marked the last of the Josef Stalin heavy tank lines as a shift to the Main Battle Tank had taken hold worldwide - making the concept of a heavy tank somewhat archaic. However, many lessons learned in the battles of World War 2 involving the IS series were put to practical use in the development of the new generation of Soviet tanks.

Operators of the IS-1, aside from the Russians, included Slovakia, Ukraine and Belorussia.

Specifications



Service Year
1943

Origin
Soviet Union national flag graphic
Soviet Union

Crew
4
CREWMEN
Production
200
UNITS


State Factories - Soviet Union
National flag of Slovakia National flag of the Soviet Union National flag of Ukraine Belorussia; Slovakia; Soviet Union; Ukraine
(OPERATORS list includes past, present, and future operators when applicable)
Fire Support / Assault / Breaching
Support allied forces through direct / in-direct fire, assault forward positions, and / or breach fortified areas of the battlefield.
Tank-vs-Tank
Engage armored vehicles of similar form and function.


Length
28.1 ft
8.56 m
Width
9.8 ft
3 m
Height
9.0 ft
2.74 m
Weight
95,813 lb
43,460 kg
Tonnage
47.9 tons
MEDIUM
(Showcased structural values pertain to the base IS-1 / JS-1 (Josef Stalin) production variant. Length typically includes main gun in forward position if applicable to the design)
Powerplant: 1 x V2-IS 12-cylinder engine delivering 520 horsepower.
Speed
23.0 mph
(37.0 kph)
Range
93.2 mi
(150.0 km)
(Showcased performance specifications pertain to the base IS-1 / JS-1 (Josef Stalin) production variant. Compare this entry against any other in our database)
1 x 85mm D-5T main gun
1 x 7.62mm DT machine gun in coaxial mount
1 x 7.62mm DT machine gun in bow superstructure
1 x 7.62mm DT machine gun in rear turret facing


Supported Types


Graphical image of a tank cannon armament
Graphical image of a tank medium machine gun


(Not all weapon types may be represented in the showcase above)
59 x 85mm projectiles
2,520 x 7.62mm ammunition


Objekt 233 - Program Model Designation
KV-13 - Program Designation
IS-1 - Base Series Designation


Military lapel ribbon for the American Civil War
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of the Bulge
Military lapel ribbon for the Battle of Kursk
Military lapel ribbon for the Cold War
Military lapel ribbon for the Falklands War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Vietnam War
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental military vehicles


Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns / operations.

Disclaimer | Privacy Policy | Cookies


2021 Military Pay Scale Army Ranks Navy Ranks Air Force Ranks Alphabet Code DoD Dictionary American War Deaths French Military Victories Vietnam War Casualties

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org, the World Directory of Modern Military Aircraft, and SR71blackbird.org, detailing the history of the world's most iconic spyplane.


Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-