5"/51 Caliber Gun
5"/51 caliber guns (spoken "five-inch-fifty-one-caliber") formed the main battery of the first United States Navy light cruisers and the secondary batteries of United States Navy battleships built from 1907 through the 1920s. United States naval gun terminology indicates the gun fired a projectile 5 inches (127 mm) in diameter, and the barrel was 51 calibers long (barrel length is 5" × 51 = 255" or 6.4 meters).
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