12.7 cm/50 Type 3 naval gun

The 12.7 cm/50 Type 3 naval gun was a medium calibre naval gun of the Imperial Japanese Navy used during World War II. It was the standard weapon for Japanese destroyers between 1928 and 1940. It has been credited as a true dual-purpose gun, but this was more a nominal capability than real as its bag propellant and need for hand ramming required the gun to be loaded at angles between 5–10° which dropped its rate of fire to a relatively slow 5–10 rounds per minute and its training speed of only 6° per second meant that it had a great deal of difficulty engaging enemy aircraft with any chance of success. After the end of World War II the gun remained in service on the two Japanese destroyers ceded to the Soviet Union and the Republic of China as war reparations, the last of which was scrapped in 1970 after running aground in a typhoon.

Country Name Origin Year
Japan 1928
Country Name Operational Year Retirement Year
Japan 1926 1927 View

Type Naval gun
Place of origin Empire of Japan
Service history
In service 1928—66
Used by  Imperial Japanese Navy
 Soviet Navy
 Republic of China Navy
Wars World War II
Production history
Designed 1926—27
Number built approx 700
Weight 4,205 kilograms (9,270 lb)
Length 6.483 metres (21.27 ft)
Barrel length 6.265 metres (20.55 ft) (length of bore)
Shell separate-loading, bag charge
Shell weight 23 kilograms (51 lb)
Caliber 127 millimetres (5.0 in)
Breech Welin interrupted screw
Elevation depended on mount
Rate of fire 5–10 rpm
Muzzle velocity 910–915 m/s (2,986–3,002 ft/s)
Maximum firing range 18,400 metres (20,100 yd)

End notes