|Engine Power (hp)||350|
|Speed Limit (km/h)||34|
|Standard Shell Penetration (mm)||73 - 99|
|Standard Shell Damage||120 - 200|
|Rate of Fire (rounds/min)||7.3|
Development started at the end of 1938. A prototype was produced in August 1939. The vehicle first saw combat in December 1939 at the Mannerheim Line. The tank was mass-produced from March 1940 through August 1942, with a total of 2,769 vehicles manufactured.