5-inch/50-caliber gun

	Chattanooga, 5"/50 caliber deck gun, probably port side forward.
Type	Naval gun; Coastal gun;
Place of origin	United States
Service history
In service	1904
Used by	United States Navy
Wars	World War I; World War II;
Production history
Designer	Bureau of Ordnance
Designed	1900
Manufacturer	U.S. Naval Gun Factory
No. built	Mark 5: 87 (Nos. 200–286); Mark 6: 64 (Nos. 293–356);
Variants	Mark 5 Mods 0–3, Mark 6 Mods 0–2
Specifications
Mass	Mark 5: 10,294 lb (4,669 kg) (with breech); Mark 6: 10,550 lb (4,790 kg) (with breech);
Length	Marks 5 and 6: 255.65 in (6,494 mm)
Barrel length	Marks 5 and 6: 250 in (6,400 mm) bore (50 calibers)
Shell	Mark 5: 60 lb (27 kg) armor-piercing; Mark 6: 50 lb (23 kg) armor-piercing;
Caliber	5 in (127 mm)
Elevation	Mark 9: −10° to +15°; Mark 12: −10° to +25°;
Traverse	−150° to +150°
Rate of fire	6–8 rounds per minute
Muzzle velocity	50lb:3,000 ft/s (910 m/s); 60lb:2,700 ft/s (820 m/s);
Maximum firing range	19,000 yd (17,000 m) at 25.3° elevation

The 5"/50 caliber gun (spoken "five-inch-fifty-caliber") was the first long barrel 5-inch (127 mm) gun of the United States Navy and was used in the secondary batteries of the early Delaware-class dreadnought battleships, various protected cruisers, and scout cruisers. They were also refitted in the secondary batteries of the armored cruiser New York and the New Orleans-class protected cruisers. They were later used on cargo ships, store ships and unclassified auxiliaries during World War II as well as in emergency coastal defense batteries.

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