| 5"/54 caliber gun Mark 16 | |
|---|---|
_c1964.jpg) A 5"/54 caliber Mark 16 gun on Midway. | |
| Type | Naval gun |
| Place of origin | United States |
| Service history | |
| In service | 1945 – 1993: USN 1945-1980, JMSDF 1958-1993 |
| Used by | U.S. Navy and Japan Maritime Self-Defense Force |
| Wars | |
| Production history | |
| Designer | Bureau of Ordnance |
| Designed | 1940 |
| Produced | 1945 – 1959 |
| Specifications | |
| Mass | 5,361 lb (2,432 kg) (without breech) |
| Barrel length | 270 in (6.9 m) bore (54 calibers) |
| Shell | 70 lb (32 kg) Mark 42 armor-piercing |
| Caliber | 5 inches (127 mm) |
| Elevation | −10° to +85° |
| Traverse | −150° to +150° |
| Rate of fire | 15–18 rounds per minute |
| Muzzle velocity | 2,650 ft/s (810 m/s) |
| Effective firing range | 19,000-yard (17,374 m) at 20° elevation |
| Maximum firing range |
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The 5"/54 caliber Mark 16 gun (spoken "five-inch-fifty-four-caliber") was a late World War II–era naval gun mount used by the United States Navy, and later, the Japan Maritime Self-Defense Force. These guns, designed originally for the Montana-class battleships and then the abortive CL-154-class cruisers, were to be the replacement for the 5"/38 caliber secondary gun batteries then in widespread use with the US Navy.