| 8"/45 caliber Mark 6 | |
|---|---|
 Admiral Montgomery M. Taylor, Commander-in-Chief of the U.S Navy Asiatic Fleet, and his fleet staff aboard the USS Rochester (CA-2) at Shanghai, China, in 1932.
Front row (left to right): Captain Montgomery E. Higgins, M.C.; Captain Ivan E. Bass; Captain Frank J. Fletcher; Admiral Montgomery M. Taylor; Commander Donald B. Beary; Captain Jeffrey F. Kutz, S.C.; and Colonel Jeffrey F. Dyer, U.S. Marine Corps. Back row (not in order): Lieutenant Henri H. Smith-Hutton; Lieutenant Commander Charles A. MacGowan; Lieutenant Commander Philip W. Warren; Lieutenant Commander Francis T. Spellman; and Lieutenant Junior Grade Royal Lovell. Other officers are unidentified. United States Navy Historical Photo #: NH 83799 | |
| Type | |
| Place of origin | United States |
| Service history | |
| In service | 1906 |
| Used by | |
| Wars | |
| Production history | |
| Designer | Bureau of Ordnance |
| Designed | 1900 |
| Manufacturer | U.S. Naval Gun Factory |
| No. built | 148 (Nos. 108–255) |
| Variants | Mark 6 Mod 1 – Mod 4 |
| Specifications | |
| Mass |
|
| Length | 30 ft 9 in (9.37 m) |
| Barrel length | 30 ft 0 in (9.14 m) bore (45 calibers) |
| Shell |
|
| Caliber | 8 in (203 mm) |
| Recoil | 28.5 in (720 mm) max |
| Elevation |
|
| Traverse |
|
| Rate of fire | 1 to 2 rounds per minute |
| Muzzle velocity |
|
| Effective firing range |
|
The 8"/45 caliber Mark 6 gun (spoken "eight-inch-forty-five--caliber") were used for the secondary batteries of the United States Navy's last pre-dreadnought battleships and refitted in older armored cruisers main batteries.[1]