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122mm D-25T


D-25S


Overview


122mm D-25T

122mm D-25T rifled gun seen on IS-2 heavy tank on display in Volgograd.
Source: Mike1979 Russia - © CC BY-SA 3.0

Origin
Soviet Union
Type
Cannon
Entered service
1944 for D-25T
1944 for A-19S
Status
Obsolete
Development
1943
Developer
Soviet Union - OKB-9
Production
1943 - 1951 or later (D-25T)
1952 - 1956 (D-25TA)
1956 - 1957 (D-25TS)
Producer
Soviet Union - No. 9 plant
D-25T, D-25S
Soviet Union - No .221 Barrikady plant
D-25TA, D-25TS
Number produced
1.735 or more A-19S
6.000 or more D-25T
675 or more D-25S
205 or more D-25TA
160 or more D-25TS
Designations
122 mm tank gun model 1943 (D-25T)
Notable users
Soviet Union

Variants


List of D-25 cannon variants

122mm A-19S
Original A-19 full thickness barrel used in the ISU-122 self-propelled gun. Compared to the towed howitzer the traverse and elevation control are both located on the same side, an electric trigger is fitted and the breech is fitted with a loading tray.
122mm D-25T
A-19 modified for tank use. This uses the prototype D-2 barrel which is thinner to reduce weight and is fitted with a double baffle muzzle brake. This is fitted to the cradle of the 85mm D-5 tank gun to mount it in a tank turret. Early production guns used an interrupted screw breech. This changed to a sliding breech design.
122mm D-25S
Derivative of the D-25T using the same barrel with modified mount for use in the casemate of a self-propelled gun.
122mm D-25TA
Modified D-25T design with new breech block and air pressure bore evacuator. After each shot toxic gasses are expelled from the barrel using a short burst of air. This is also fitted with a rammer attached to the loading tray to improve rate of fire.
122mm D-25TS
Modified D-25TA for use in a PUOT-1 single plane or PUOT-2 two plane stabilized gun mount. A bore evacuator is located towards the muzzle brake instead of the pressurized air system.

122mm D-25TA

Line diagram of 122mm D-25TA gun in T-10 turret as seen from the side and from the top.
Source: www.btvt.info - © Copyright lies with original owner

Details


Facts 122mm D-25T
General
Origin
Soviet Union
Type
Cannon
Barrel
Caliber
122mm separate loading shells
Barrel length
5.9 m
Rifling
Yes
Muzzle brake
Double baffle muzzle brake
Muzzle velocity
795 m/s for BR-471B and O-471
Operation
Action
Manually loaded
Breech
Semi-automatic sliding wedge
Interrupted screw on early production batches
Rate of fire
2 to 3 rpm
Recoil mechanism
Hydraulic recoil brake and hydropneumatic recuperator
Recoil force
8 MJ
Recoil stroke
0.57 m maximum
Dimensions
Weight
2.4 t moving mass of the gun

Platforms


IS-2

The IS-2 was the first heavy tank to mount the D-25T.

ISU-122S

The ISU-122S is armed with the D-25S, which is derived from the D-25T.

IS-3

The IS-3 is armed with the D-25T main gun.

IS-4

The IS-4 was armed with the D-25T main gun. It was to be fitted with a different 100mm gun, but that combination proved troublesome during prototype testing.

T-10

The T-10 is armed with the D-25TA gun. This is fitted with an air pressure bore evacuator and modified breech block.

T-10A and B

The T-10A and T-10B are fitted with the D-25TS main gun. These are fitted with a stabilizer system. Both also use a loading tray with electromechanical rammer to improve rate of fire.

Media


Related articles


122mm A-19

The 122mm D-25T is derived from the 122m A-19 towed howitzer. It fires the same range of two piece ammunition.

122mm M-62T2

The 122mm M-62T2 was developed as a successor to the D-25T. It has a similar caliber, but fires newer ammunition types at higher velocities and flatter trajectories.