Type 4 30cm SP Heavy Mortar Carrier "Ha-To"
- Introduced Year : 1944
- Weight : 15 ton
- Dimensions: 6.8 x 2.4 x 2.75(h) m
- Armor (max) : 8 mm
- Speed (max) : 40 km/hr
- Engine : Diesel Engine 165 HP/2000 rpm
- Armaments : Type 3 300 mm Heavy Mortar, Type 97 7.7 mm x 1
- Crew : 7
- Production Qty : 4
Ha-To was developed in order to motorize the heavy mortar. Its chassis was converted from the prime mover "Chi-So" or "Chi-Ke". Ha-To was regarded as an effective vehicle, but it was not produced due to the progress of rocket artillery.