| 41 cm/45 3rd Year Type naval gun | |
|---|---|
 41 cm/45 3rd Year Type naval gun from the battleship Mutsu outside the Yamato Museum | |
| Type | Naval gun Coast-defense gun |
| Place of origin | Japan |
| Service history | |
| In service | 1920–1945 |
| Used by | Imperial Japanese Navy |
| Wars | World War II |
| Production history | |
| No. built | about 40 |
| Specifications | |
| Mass | 102,000 kilograms (224,872 lb) |
| Length | 18.84 meters (61 ft 10 in) |
| Barrel length | 18.394 meters (60 ft 4.2 in) (45 calibers) |
| Shell | Separate-loading, bagged charge |
| Shell weight | 1,020 kilograms (2,250 lb) |
| Caliber | 41 centimeters (16.1 in) |
| Breech | Welin breech block |
| Elevation | –2° to +35° (later –3° to +43°) |
| Rate of fire | 1 round per 24 seconds |
| Muzzle velocity | 780–790 meters per second (2,600–2,600 ft/s) |
| Effective firing range | 30,200 meters (33,000 yd) |
| Maximum firing range | 38,400 meters (42,000 yd) |
The 41 cm/45 3rd Year Type naval gun is a 41-centimeter (16.1 in) breech-loading naval gun designed during World War I for the Imperial Japanese Navy. It served as the primary armament in the Nagato-class dreadnoughts completed after the end of the war and in coast defense mountings. Two turrets and their guns were salvaged during the 1970s from the wreck of the Japanese battleship Mutsu and are on display in Japan.