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Soviet Union's Flag

Soviet Union's JSU-122 self propelled gun
ISU-122 self propelled gun
Samokhodnaya Ustanovka (self propelled mounting)

Photos

ISU-122 self propelled gun:
Soviet Union's ISU-122 self propelled gun
Aberdeen Tank Museum

Design

The ISU-122 was designed by a design team at Chelyabinsk, the Mechanized Artillery Bureau (BAS), and General F. Petrov. The ISU-122 was to be based on the IS-2's hull and chassis.

Had larger muzzle brake and better armor penetration.

Main Armament

The 152 mm gun wasn't available from the factories so the team decided to put a 122 mm A-19 gun into the superstructure. As the A-19 and the 152 mm gun used the same carriage is was relatively easy to add it in place of the 152 mm.

The mantlet was in two pieces and bolted onto the right side of the hull.

Model Type Weight Muzzle Velocity Direct
Fire Range
Indirect
Fire Range
Penetration
500 m 1,000 m
    55 lb     13,000 m    
  HE   2,620'/sec        
A-19 AT 25 kg 800 m/sec        
D-258 AT 25 kg 781 m/sec     155 mm 145 mm

The A-19S did not have a muzzle brake. The first vehicles had the 122 mm 1931/43 A-19 L/46.3 gun. Starting in 1944 the ISU-122 had the 122 mm D-25S gun installed. This was the same gun as in the IS-2. The gun mantlet was altered and the crew space was improved.

Prototype

Prototypes with the 122 mm gun were designated the ISU-249 or Object 241.

Production

The ISU-122 entered service in December 1943.

  • ISU-122: ~2,500
    • Production: 1944
    • Manufacturer: Soviet arsenals
  • ISU-122 and ISU-152: 4,075
    • 1943: 35
    • 1944: 2,510
    • 1945: 1,530

Variants

  • ISU-249 (Project 249): Prototype. Had 122 mm 1931/43 cannon, A-19.
  • ISU-122: Had 122 mm 1931/43 L/46.3 cannon, A-19.
  • ISU-122 1943?: Had 122 mm 1943 L/43, D-258 cannon. Had a double acting muzzle brake. The gun was in a ball shaped mantlet.
  • ISU-122 BM: Had 122 mm BL-7 L/60.
  • ISU-122 E: Test model.
  • ISU-130: Test model. Had 130 mm gun.

Usage

The ISU-122 was used with the ISU-152 in 56 Independent Heavy Self-Propelled Artillery Regiments, which became Guard units after December 1944.

Specifications

  ISU-122,
JSU-122
Crew 5
Physical Characteristics  
Weight 101,920 lb, 102,361 lb
41.1 tons, 45.5 tons, 46 tons, 50.7 tons
41,800 kg, 46,000 kg, 46,340 kg
Length w/gun 32' 1.8", 32' 10", 33' 5"
9.8 m, 9.85 m
Length w/o gun 22' 3.9", 22' 4"
6.8 m, 6.805 m
Height 8' 1", 8' 2", 8' 3.2", 8' 3.5",
2.46 m, 2.48 m, 2.52 m
Width 10', 10' 1", 10' 2.5", 11' 8.2"
3.07 m, 3.56 m
Width over tracks  
Ground clearance 18"
Ground contact length 169"
Ground pressure 11.6 psi
Armament  
Main 122 mm M-1944 L/45 A-10
122 mm A-19S
122 mm
122 mm Model 1938 howitzer
122 mm D25S or A-19S
Secondary  
MG 12.7 mm MG
12.7 mm DShK-38 MG, AA
Side arms  
Quantity  
Main 30, 40
Secondary  
MG 450
Side arms  
Armor Thickness (mm) 120
Front: 3.54"
Front: 90
Hull Front, Upper 3"@0°, 90
Hull Front, Lower  
Hull Sides, Upper 1.77"@0°, 90
Hull Sides, Lower  
Hull Rear 1.77"@0°, 60
Hull Top 30
Hull Bottom 30
Superstructure Front Mantle: 7.75"@0°
Superstructure Sides  
Superstructure Rear  
Superstructure Top  
Engine (Make / Model) W-2-IS, V-2
Model W-2
Bore / stroke  
Cooling Water
Cylinders V-12
Capacity  
Net HP 520, 600
Power to weight ratio  
Compression ratio  
Transmission (Type) Dual range epicycle
8 forward, 2 reverse
Steering Clutch brake
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Diesel
Octane  
Quantity 110 gallons, 189 gallons
860 liters
Road consumption 1.3 mpg
Cross country consumption  
Performance  
Traverse 10° each way
Speed - Road 23 mph
37 kph
Speed - Cross Country  
Range - Road 112 miles, 137 miles, 138 miles, 149 miles, 150 miles
180 km, 220 km, 240 km
Range - Cross Country 50 miles
80 km
Turning radius  
Elevation limits  
Fording depth 4' 3", 4' 3.2"
1.3 m
Trench crossing 8' 2"
Vertical obstacle 3' 3"
Climbing ability 36° slope
Suspension (Type) Christie type coil spring torsion bar
Wheels each side 6
Return rollers each side 3
Tracks (Type) Steel skeleton, dry pin
Length  
Width 27.5"
Diameter  
Number of links 87-90
Pitch 6.25"
Tire tread  
Track centers/tread 86"
  ISU-122-2,
ISU-122 1944
Crew 5
Physical Characteristics  
Weight 45.5-46 tons
Length w/gun 9.059-9.18 m
Length w/o gun 6.77 m
Height 2.48 m
Width 3.07 m
Width over tracks  
Ground clearance 0.4-0.47 m
Ground contact length  
Ground pressure 0.81 kg/cm
Armament  
Main 122 mm 1943 D-25 S
Secondary  
MG 12.7 mm DSchK 38/43 AA
Side arms  
Quantity  
Main 20-30
Secondary  
MG 250
Side arms  
Armor Thickness (mm)  
Hull Front, Upper 75-90
Hull Front, Lower 60-90
Hull Sides, Upper 60
Hull Sides, Lower 90
Hull Rear 60
Hull Top 20-30
Hull Bottom 20-30
Superstructure Front  
Superstructure Sides  
Superstructure Rear  
Superstructure Top  
Engine (Make / Model) W-2-IS
Bore / stroke 4 stroke
Cooling  
Cylinders V-12
Capacity  
Net HP 600@2,000 rpm
Power to weight ratio 10.9 hp/ton
Compression ratio  
Transmission (Type)  
Steering  
Steering ratio  
Starter  
Electrical system  
Ignition  
Fuel (Type) Diesel
Octane  
Quantity 520-560 liters
Road consumption  
Cross country consumption  
Performance  
Traverse  
Speed - Road 37 kph
Speed - Cross Country  
Range - Road 1944: 220 km
Range - Cross Country  
Turning radius  
Elevation limits  
Fording depth 1.3-1.5 m
Trench crossing 2.5-2.7 m
Vertical obstacle 1-1.2 m
Climbing ability 36°
Suspension (Type)  
Wheels each side  
Return rollers each side  
Tracks (Type)  
Length  
Width  
Diameter  
Number of links  
Pitch  
Tire tread  
Track centers/tread  

Sources:

  1. Russian Tanks of World War II Stalin's Armored Might, by Tim Bean & Will Fowler, 2002
  2. Russian Tanks and Armored Vehicles 1917-1945, by Wolfgang Fleischer, 1999
  3. The Encyclopedia of Tanks and Armored Fighting Vehicles - The Comprehensive Guide to Over 900 Armored Fighting Vehicles From 1915 to the Present Day, General Editor: Christopher F. Foss, 2002
  4. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  5. Removed
  6. Tank Data 2, Aberdeen Proving Grounds Series, E. J. Hoffschmidt and W. H. Tantum IV, 1969
20th Century American Military History Crucial Site