4.7 inch QF Mark IX & XII

The 4.7 inch QF Mark IX and Mark XII were 120-mm 45-calibre naval guns which armed the majority of Royal Navy and Commonwealth destroyers in World War II, and were exported to many countries after World War II as the destroyers they were mounted on were sold off.

Country Name Origin Year
United Kingdom - UK (Great Britain) 1928
Country Name Operational Year Retirement Year
Argentina View
Australia View
Brazil View
Canada View
Dominican Republic View
Greece View
Netherlands View
Poland View
Turkey (Ottoman Empire) View
United Kingdom - UK (Great Britain) 1928 View
Norway View

Type Naval gun
Place of origin United Kingdom
Service history
In service 1928-1970?
Used by Royal Navy
Royal Canadian Navy
Royal Australian Navy
Royal Hellenic Navy
Royal Netherlands Navy
Polish Navy
Royal Norwegian Navy
Turkish Navy
Dominican Navy
Argentine Navy
Brazilian Navy
Wars World War II
Korean War
Production history
Number built 742 (Mk IX); 372 (Mk XII)
Weight 2.963–2.984 long tons (3,011–3,032 kg) (Mk IX)
3.238–3.245 long tons (3,290–3,297 kg) (Mk XII)
Length 220.62 in (5.60 m) (Mk IX)
224.08 in (5.69 m) (Mk XII)
Barrel length Bore: 212.58 in (5.40 m) L/45 (cal)
Shell Separate-loading
Shell weight 50 pounds (22.7 kg) SAP orHE
Calibre 4.7 inches (120 mm)
Breech Semi-automatic horizontal sliding-block
Recoil Hydro-pneumatic
Elevation Varied by mounting
Rate of fire about 12 rounds per minute
Muzzle velocity 2,650 ft/s (810 m/s)
Maximum firing range 16,970 yards (15,520 m) at 40°

End notes