The production of SU-85 self-propelled guns was started in September 1943...The production of SU-85 self-propelled guns was started in September 1943. The self-propelled part was made on the basis of T-34-85 tank and SU-122. The thickness of front armor was equal to 45mm. The ammunition supply consists of 48 rounds. The crew was 4 members. In total 2644 machines were produced.