| 5"/31 caliber Mark 1 Naval Gun | |
|---|---|
| Type | Naval gun |
| Place of origin | United States |
| Service history | |
| In service | 1889–1910 |
| Used by |  United States Navy |
| Wars | Spanish–American War |
| Production history | |
| Designer | Bureau of Ordnance |
| Designed | 1885 |
| Manufacturer | U.S. Naval Gun Factory |
| Produced | 1885 |
| No. built | 2 |
| Variants | Mark 1 Mod 0 and 1 |
| Specifications | |
| Mass | 6,190 lb (2,810 kg) (without breech) |
| Length | 159.97 in (4.063 m) Mark 1 Mod 1 |
| Barrel length | 153.97 in (3.911 m) bore (31 calibers) |
| Shell | 50 lb (23 kg) |
| Caliber | 5 inches (127 mm) |
| Traverse | −150° to +150° |
| Rate of fire | 6 rounds per minute |
| Muzzle velocity | 2,300 ft/s (700 m/s) |
| Maximum firing range | 16,000-yard (14,630 m) at 30° elevation |
The 5"/31 caliber gun (spoken "five-inch-thirty-one-caliber") were used in the secondary batteries of the United States Navy's "New Navy" protected cruiser Chicago and later mounted in Panther during the Spanish–American War.[1]