[Edit]
15.5cm Triple Secondary Gun Mount
No.12 15.5cm三連装副砲
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 Secondary GunEffects:
 +7  +3  +2  MediumScrap value:
 2  5 (Buildable) | |
| Refittable Class | |
| Coastal Defense Ship | Destroyer |
| Light Cruiser | Torpedo Cruiser |
| Heavy Cruiser | Training Cruiser |
| Aviation Cruiser | Fast Battleship |
| Battleship | Aviation Battleship |
| Light Carrier | Standard Aircraft Carrier |
| Armored Carrier | Seaplane Tender |
| Submarine | Aircraft Carrying Submarine |
| Submarine Tender | Fleet Oiler |
| Repair Ship | Amphibious Assault Ship |
Introduction
巡洋艦の主砲だったものを、戦艦の副砲として活用しました。
「大和」型に搭載され、対空戦も可能な、性能・運用ともに優秀な戦艦副砲となりました。
砲塔部の装甲が薄いのが玉に傷で、諸説ありますが「大和」型の唯一の弱点という指摘もありました。
Although designed to be a part of the cruiser's main battery, it saw a more practical use as the battleship's secondary armament.
The Yamato-class was designed with this, for potential use as an anti-aircraft gun, however its combined ability and performance were outstanding enough to be used as the battleship's secondary armament.
However, the turret section's armor was very thin, resulting in various rumors about it being the Yamato-class' Achilles' heel when pointed out.
Notes
Buildable
Improvement
Improvement Cost:  10 90 120
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★ | 
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S | M | T | W | T | F | S | Helper Ship |
|---|---|---|---|---|---|---|---|---|---|---|---|
| - | 0 | 2/2 | 2/3 | M M K N |
✗ | ✗ | ✗ | ✗ | M M K Y |
M M K Y |
Musashi Musashi Kai Musashi Kai Ni Yamato (Kai) |
Consumes: 1x  15.5cm Triple Secondary Gun Mount
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6 | 2/3 | 2/4 | ||||||||
Consumes: 1x  New Model Gun Mount Improvement Material2x 15.5cm Triple Secondary Gun MountProduces: 1x 15.5cm Triple Secondary Gun Mount Kai
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10 | 8/12 | 4/8 |
Trivia
The Mogami-class and eventually the Tone-class were supposed to carry the gun. But when more practical use was seen on Yamato-class and Ooyodo, it then remained as part of the battleship's main weaponry. One factor for the gun design change was that the gun was supposed to have an additional 75° for AA firing on top of the main 45° for general firing, but this was switched to +55 degrees for the reasoning that it was too inefficient.
The "Achilles' heel" portion refers to the relatively inferior armor thickness of the turret part, albeit being colossally improved compared to casemate guns of other Japanese battleships (Fusou-class to Nagato-class).
See also
- 15.5 cm/60 3rd Year Type naval gun
- 60口径三年式15.5cm3連装砲 (Japanese Wikipedia)
- Japan 15.5 cm/60 (6.1") 3rd Year Type (NavWeaps)