12-inch/45-caliber Mark 5 gun
< 12-inch
| 12-inch/45-caliber Mark 5 Naval Gun | |
|---|---|
Mark 5 gun being hoisted aboard USS Connecticut | |
| Type | Naval gun Coastal defence |
| Place of origin | United States |
| Service history | |
| In service | 1906–1930 |
| Used by |
|
| Wars | |
| Production history | |
| Designer | Bureau of Ordnance |
| Designed | 1903 |
| Manufacturer | U.S. Naval Gun Factory |
| Specifications | |
| Mass | 53 short tons (48 t) |
| Barrel length | 45 ft 0 in (13.72 m) bore (45 calibers) |
| Shell | 870 lb (390 kg) |
| Caliber | 12 in (305 mm) |
| Elevation | -5° to +15° |
| Rate of fire | 2–3 rpm |
| Muzzle velocity | 2,700 ft/s (820 m/s) |
| Effective firing range | 20,000 yd (18,288 m) at 15° elevation 30,000 yd (27,432 m) at 47° elevation As coastal artillery |
The 12-inch/45-caliber Mark 5 gun was an American naval gun that first entered service in 1906. Initially designed for use with the Connecticut-class of pre-dreadnought battleships, the Mark 5 continued in service aboard the first generation of American dreadnoughts.