Type 4 15 cm howitzer

The Type 4 15 cm Howitzer was a heavy howitzer used by the Imperial Japanese Army during the Second Sino-Japanese War and World War II. The Type 4 designation was given to this gun as it was accepted in the 4th year of Emperor Taishō's reign (1915).

Type 4 15 cm howitzer
Class Vehicle
Type Towed Artillery
Manufacturer Osaka RZ
Origin Japan
Country Name Origin Year
Japan 1915
Country Name Operational Year Retirement Year
China View
Japan 1915 1949 View
ManufacturerName Production From Production To Quantity
Osaka RZ 280 View

The Type 4 15 cm Howitzer was designed by the Army’s Osaka Armory to rectify the shortcomings of the Type 38 15 cm howitzer – namely its lack of portability. The Type 96 15 cm Howitzer was intended to replace it, but it remained in use throughout World War II. Weapons captured by the Chinese remained in use at least through the Chinese Civil War. The Type 4 (1915) 150-mm Howitzer was designed during World War I to replace the Type 38 15 cm Howitzer. It was manufactured in considerable quantities and remained the standard Japanese medium artillery piece until 1936.

The Type 4 is the first Japanese weapon to replace the hydrospring recoil system with the hydropneumatic. Its modified box trail allows it to fire at extreme elevations, increasing its usefulness in jungle or rugged terrain.

Type 4 15 cm Howitzer was considered somewhat obsolescent for frontline combat service from the start of the Second Sino-Japanese War, but as insufficient quantities of the Type 96 15 cm howitzer were produced, it remained in service on many fronts during the Pacific War. Against the Chinese, the Type 4 was used with some success due to the fact the Chinese were desperately lacking in heavy artillery in the early part of the war. However, whenever the Japanese did face Chinese heavy artillery typically armed with German 15 cm sFH 18 heavy artillery guns, e.g. in the Battles of Wuhan and Changsha, Type 4 crews found themselves badly outranged and hopelessly outgunned.

Weapons captured by the Chinese during the Second Sino-Japanese War, or abandoned in China at the time of the surrender of Japan, were placed into service by both the National Revolutionary Army of the Nationalist government and the People's Liberation Army of the Chinese communist forces through the Chinese Civil War.

Type heavy howitzer
Place of origin  Empire of Japan
Service history
In service 1915-1949?
Used by  Imperial Japanese Army
 Republic of China (NRA)
 People's Republic of China (PLA)
Wars Second Sino-Japanese War
Soviet-Japanese Border Wars
World War II
Chinese Civil War
Production history
Designer Osaka Arsenal
Designed 1915
Manufacturer Osaka Arsenal
Number built 280
Weight 2,797 kilograms (6,166 lb) Firing
2,194 kg (4,837 lb) Barrel 2,145 kg (4,729 lb) Cradle Traveling
Length 2.59 m (8 ft 6 in) Firing
8.33 m (27 ft 4 in) Traveling
Barrel length 2.169 m (7 ft 1 in) L/14.6
Width 1.52 m (5 ft 0 in) Track
61.85 m (202 ft 11 in) Barrel, 1.88 m (6 ft 2 in) Cradle Maximum
Height 1.32 m (4 ft 4 in) Barrel, 2.11 m (6 ft 11 in) Cradle
Shell 35.9 kilograms (79 lb)
Caliber 149.1 mm (5.87 in)
Breech vertical sliding
Recoil hydro-pneumatic
Carriage Modified box trail. Wheels and Tires or Iron tires on wooden wheels.
Elevation -5° to +65°
Traverse 30° left, 30° right
Rate of fire 3-4 rounds/minute
Muzzle velocity 410 m/s (1,345 ft/s)
Maximum firing range 9,575 metres (10,471 yd)
Sights Panoramic

End notes