| 15 cm/50 41 Year Type | |
| Origin: | Japan |
| Type: | Naval gun, coastal defence |
| Is Ranged: | yes |
| Is Artillery: | yes |
| Service: | 1913-1945 |
| Used By: | Imperial Japanese Navy |
| Wars: | World War I World War II |
| Design Date: | 1908 |
| Weight: | 8360kg (18,430lb) |
| Length: | 7.8m (25.6feet) |
| Part Length: | 7.6m (24.9feet) |
| Cartridge: | 100lb |
| Caliber: | 6adj=onNaNadj=on |
| Rate: | 6 (effective) |
| Velocity: | 850m/s |
| Range: | Kongō & Fusō: 18000m (59,000feet) at 30° Agano: 21000m (69,000feet) at 45°[1] |
| Elevation: | Kongō & Fusō: -5 to +30 Agano: -5 to +55 |
| Traverse: | Kongō & Fusō: -70 to +70 Agano: -150 to +150 |
The was a naval gun used by the Imperial Japanese Navy before and during World War II. It had a 152mm bore with a length of 7.6m (24.9feet) (50 calibre) and fired 45.4kg (100.1lb) shell for a distance of 18000m (59,000feet) (in single mount version) or 21000m (69,000feet) (in the later twin mounts). The gun was first used in single casemates on the Kongō-class battlecruisers and Fusō-class battleships and later in the Agano-class light cruisers in twin mountings.
The Type 41 was a Japanese version of the Vickers "Mark M", originally introduced by Vickers-Armstrong (Barrow) as the secondary battery for the Kongō-class. These original guns were designated by the Japanese Navy as the "Mark II", whereas the Japanese-designed copy (adopted from 1912) were designated as the "Mark III".
In the 1930s, the Kongō-class were modernized, at which time these guns were replaced by new 12.7 cm/40 DP guns. The old guns were placed in storage and were reused on the Agano-class. Some were taken to Guam and were used for coastal defense batteries.
In the Agano-class, the gun could elevate to 55° for anti-aircraft fire; however, its manual loading method allowed a rate of fire of only about 6 rounds per minute, which significantly limited its utility as an anti-aircraft weapon.