Military Factory logo
Icon of F-15 Eagle military combat fighter aircraft
Icon of Abrams Main Battle Tank
Icon of navy warships
Icon of AK-47 assault rifle

Type 99 SPH

155mm Self-Propelled Howitzer (SPH)

The Japanese Army Type 99 155mm Self-Propelled Howitzer vehicle is based on the chassis of the Type 89 Infantry Fighting Vehicle.
Authored By: Staff Writer | Edited: 8/6/2018
National Flag Graphic


Year: 1999
Manufacturer(s): Mitsubishi Heavy Industries / Japan Steel Works - Japan
Production: 117
Capabilities: Fire Support/Assault/Breaching;
Crew: 4
Width: 10.50 ft (3.2 m)
Weight: 40 tons (36,290 kg); 80,006 lb
Power: 1 x Mitsubishi 6SY31WA 6-cylinder diesel engine developing 600 horsepower.
Speed: 31 mph (50 kph)
Range: 186 miles (300 km)
Operators: Japan
The ongoing modernization of the Japanese Ground Self-Defense Force (JGSDF) has included the introduction of an all-new Self-Propelled Howitzer (SPH) system in the "Type 99".The vehicle was used to succeed the old stock of Type 75 SPH systems adopted in 1975 (201 built). Mitsubishi Heavy Industries (hull) and Japan Steel Works (main gun) have collaborated in producing the Type 99 to which the effort has yielded 111 total vehicles heading into 2015.

As its core, the Type 99 follows conventional design wisdom as SPH systems go. It is a 40 ton vehicle with a crew of four - the commander, gunner, and loader housed in the boxy turret structure and the driver in the front-right of the hull with the powerpack to his left. The 155mm L52 main gun (by Japan Steel Works) unit sits in the frontal panel of the turret and is capped by a multi-baffled muzzle brake. The turret gives the gun an elevation span and 360-degree traversal to engage at most any indirect fire angle without having to turn the hull around to meet the target/target area. A rate-of-fire of six rounds per minute can be achieved for a limited duration (resupply available through the Type 99 ammunition carrier). A 12.7mm M2HB heavy machine gun is carried on the turret roof for local defense as are smoke grenade dischargers. The hull incorporates aluminum alloy armor protection which protects against small arms fire and artillery spray and is based on that of the Mitsubishi Type 89 Infantry Fighting Vehicle (IFV) having entered service in 1989 (120 built).

Power to the vehicle is served through a Mitsubishi 6SY31WA 6-cylinder diesel-fueled engine of 600 horsepower output. This provides the Type 99 with a road speed maximum of 50 kph with an operational road range out to 300 kilometers. Cross-country travel is aided by a torsion bar suspension system. The running gear includes a typical track-over-wheel approach in which seven double-tired road wheels are featured to each hull side. The drive sprocket is at front with the track idler at rear.


1 x 155mm L52 main gun
1 x 12.7mm Browning M2HB anti-aircraft machine gun
Smoke Grenade Dischargers

Not Available.

Variants / Models

• Type 99 - Base Series Designation
• Type 99 Resupply Vehicle - Ammunition Carrier based on the Type 99 chassis and hull.
Site Disclaimer  |  Privacy Policy  |  Cookies  |  Site Map Site content ©2003-, All Rights Reserved.

The "Military Factory" name and logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT

Part of a network of sites that includes, GlobalFirepower, a data-driven property used in ranking the top military powers of the world, and, the World Directory of Modern Military Aircraft.

Facebook Logo YouTube Logo