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5"/31 caliber Mark 1 Naval Gun
Type Naval gun
Place of origin Flag of the United States.svg 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
Number built 2
Variants Mark 1 Mod 0 and 1
Weight 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 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]


Mark 1, Nos. 1 and 2, were 31 calibers and two of the first steel tube guns that were built entirely in the United States. They were trunnioned guns, no liners and that fired bag ammunition. After the Spanish-American War was over they were modified to Mod 1 in 1901. A liner was inserted in the breech end and the trunnions were cut off. The Mod 1 consisted of tube, jacket, and 9 hoops. After these changes the gun was able to use the same ammunition as the later Mark 2 5-inch gun.[1][2]

Naval ServiceEdit

Ship Gun Installed Gun Mount
USS Chicago (1885) Mark 1 Mod 0: 2 × 5"/30 caliber (removed April 1898) Mark 1: 2 × single mounting with gravity return
USS Panther (1889) Mark 1 Mod 0: 2 × 5"/30 caliber (installed July 1898) Unknown


External linksEdit

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