The T-111, also called T-46-5, was an improved BT-IS. This vehicle appeard in March 1937, and Alexander Morozov was the designer of it. With 60mm thick armour plates in the front, this was going to do the T-111 immobile against 37mm AT-guns, and also against 76mm AT-guns on ranges above 1.200 yards. This vechicle weighed 28 tons and used a dieselengine with 300hp. This resulted in a maximum speed of 30 km/h. The armament consisted of a 45mm antitank-gun, and two machineguns, of which the first one was co-axially mounted with the gun, and the second one fitted in the rear turret. The crew consisted of 4 men.