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Heavy Tank Production, Spring-Summer 1945

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"State Committee of Defense Decree #7950ss
Moscow, Kremlin
March 29th, 1945

On the modernization of the heavy IS-2 tank, the State Committee of Defense decrees that:
  1. The proposal of the People's Commissar of Tank Production (comrade Malyshev) and Deputy Commander of Armoured and Motorized Forces (comrade Korobkov) to accept the IS-3 (modernized IS-2 heavy tank) tank with the following characteristics, designed by the Kirov factory in Chelyabinsk, into service.
    1. Overall data, mass, and size:
      1. Combat mass, tons: 46-46.5
      2. Hull length: 6850 mm
      3. Height to periscope top: 2450 mm
      4. Full width: 3170 mm
      5. Clearance: 465 mm
      6. Bore axis height: 1800 mm
      7. Range with main tanks: 120-150 km
    2. Armour:
      1. Hull: welded
      2. Thickness and angle of armour plates:
        1. Upper front plates: 120 mm at 55 deg
        2. Lower front plate: 110 mm at 55 deg
        3. Lower side: 90 mm at 0 deg
        4. Upper side: 90 mm at 60 deg
        5. Upper rear: 60 mm at 49 deg
        6. Lower rear: 60 mm at 41 deg
        7. Floor: 16-20 mm
        8. Roof: 20-30 mm
        9. Turret: cast with variable thickness from 75 to 250 mm, with slopes from 30 to 70 deg
    3. Turret ring diameter: 1840 mm
    4. Armament:
      1. 122 mm D-25 gun
      2. DShK AA machinegun
      3. DT machinegun
      4. Gun elevation: +20 degrees +/- 2 degrees
      5. Gun depression: -3 degrees +/- 0.5 degrees
      6. Ammunition:
        1. 28 gun shells
        2. 5 DShK belts
        3. 12 DT magazines
        4. 25 F-1 grenades
    5. Observation and aiming devices:
      1. Telescopic T-Sh-14 sight
      2. Collimating KV-T sight
      3. Prismatic MK-IV periscopes:
        1. Commander (1)
        2. Driver (1)
        3. Loader (1)
        4. Gunner (1)
    6. Other characteristics are same as on the IS-2 tank.
  2. The People's Commissariat of Tank Production (comrade Malyshev) and Kirov factory (comrade Zaltsmann) must correct the defects discovered in the trials of the IS-3 tank before organization of its mass production.
  3. The People's Commissariat of Tank Production (comrade Malyshev) and Kirov factory (comrade Zaltsmann) must provide for production of heavy tanks and SPGs in the following amounts:

    April

    May

    June

    IS-3

    25

    100

    250

    IS-2

    225

    250

    -

    ISU-152

    100

    100

    100

    ISU-122

    150

    150

    150

    Total

    500

    500

    500

  4. The People's Commissariat of Tank Production (comrade Malyshev) and factory #200 (comrade Sherbakov) must provide for production of hulls and turrets for them in the following amounts:

    Uralmash factory

    Factory #200

    Total

    April

    May

    June

    April

    May

    June

    April

    May

    June

    IS-3

    30

    75

    100

    25

    90

    175

    55

    165

    275

    IS-2

    60

    15

    -

    150

    90

    -

    210

    105

    -

    ISU

    225

    225

    250

    -

    -

    -

    225

    225

    250

    Total

    315

    315

    350

    175

    180

    175

    490

    495

    525

  5. The GOKO operations bureau must review the measures taken by the NKTP for production of the IS-3 tank in 5 days.
  6. The secretaries of the Chelyabinsk and Sverdlovsk VKP(b) regional committees must aid the Kirov factory, factory #200, Uralmash, and factory #255 in their execution of this decree on production of IS-3 heavy tanks.
Chair of the State Committee of Defense, I. Stalin."


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