In April 1940 the T-34 drawings have transferred to the Stalingrad tractor factory (STZ). T-34 model 1940 had a lot of technological defects, therefore both factories continuously improved its construction to increase combat efficiency. So, from middle of March 1941 the factory No.183 equips T-34 with a long barrel gun F-34 instead of L-11, and from April 1941 STZ begins to mount a new gun too. KhPZ and STZ built together 1,225 tanks T-34, to the beginning of Great Patriotic was in June 1941. In the beginning of war in all western military districts were available 967 tanks T-34.
Performances:
Combat weight : 28,120 kg
Armour : 20-45 mm
Armament : 76mm F-34 gun with 77 shells
and two 7.62mm DT machine gun with 2,394 cartridges
Engine : V-2-34 diesel rated 500 h.p.
Max speed : 55 km/h
Radius of action : 300 km
Crew : 4 persons