The Type 4 Chi-To was a thirty-ton, all-welded medium tank with a maximum armor thickness of about 75 millimetres (3.0 in) on the frontal plates. The tank was 6.73 m (22.1 ft) long, 2.87 m (9 ft 5 in) high, and 2.87 m (9 ft 5 in) wide. The Type 4 had a crew of five men. The tracks were supported by seven road wheels. It was powered by a 300 kW (400 hp) engine, which was significantly more powerful than the 180 kW (240 hp) engine of the 19-ton Type 3 Chi-Nu tank. This gave it a top speed of 45 km/h (28 mph). The main armament consisted of a long-barreled Type 5 75 mm Tank Gun which was a variant of the Japanese Type 4 75 mm AA Gun. The gun was mounted in a large, hexagonal turret. A single 7.7 mm machine gun was mounted in the hull.