40 cm/45 Type 94 naval gun

The Japanese "40 cm/45 Type 94 naval gun" was the largest bore gun ever mounted on any warship. They were actually 46 cm (18.1 in) guns, but were designated 40 cm (15.7 in) in an effort to hide their true size.

Country Name Origin Year
Japan 1940
Country Name Operational Year Retirement Year
Japan 1940 1945 View

Type Naval gun
Place of origin Empire of Japan
Service history
In service 1940–1945
Used by Imperial Japanese Navy
Wars World War II
Weight 147.3 tonnes
Length OA 21.13 m (69 ft 4 in) L/46
Shell Separate charges and shell
Calibre 460 mm (18.1 in)
Elevation +45/-5 degrees. 10°/s
Traverse 300°, 2°/s
Rate of fire 2 rounds/min
Muzzle velocity 780 m/s (2,600 ft/s)
Effective firing range 25 km (16 mi)
Maximum firing range 42 km (26 mi) at 45° elevation

End notes