| QF 5.25-inch Mark I | |
|---|---|
 5.25-inch turret on HMS Sirius. The empty cartridge cases from firing in support of the Allied invasion of Normandy, June 1944 | |
| Type | Dual-purpose gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1940-1985 (naval)[note 1] 1942-1960s (land) |
| Used by | Royal Navy Royal Artillery Royal Australian Artillery |
| Wars | World War II Korean War |
| Production history | |
| Designed | 1935 |
| Variants | Mk I, Mk II[note 2] |
| Specifications | |
| Mass | Barrel & breech: 9,616 lb (4,362 kg) |
| Length | Total: 22 ft 11.5 in (7 m) |
| Barrel length | Bore: 21 ft 10.5 in (6.67 m) 50 calibres |
| Shell | 133x782 mm R Separate QF, 80 pounds (36.29 kg)[1] |
| Calibre | 5.25-inch (133 mm) |
| Elevation | -5 to +70 degrees |
| Rate of fire | 7-8 rpm sustained fire |
| Muzzle velocity | Naval: 2,672 ft/s (814 m/s) [2] Army AA: 2,800 ft/s (850 m/s)[3] |
| Effective firing range | Naval: 23,400 yd (21,400 m) at 45 degrees with HE shell at 2,600 ft/s (790 m/s) AA: 36,000 ft (11,000 m)[3] |
| Maximum firing range | Naval: 24,070 yd (22,010 m) at 45 degrees with HE shell at 2,672 ft/s (814 m/s) AA: 46,500 ft (14,200 m)[2] |
The QF 5.25-inch Mark I gun was the heaviest dual-purpose gun used by the Royal Navy during the Second World War. Although considered less than completely successful, it saw extensive service.[1] 267 guns were built.[1]
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