15cm Single Secondary Gun Mount
[Edit]
No.565 15cm単装副砲
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 Secondary GunEffects:
 +2  +1  ShortScrap value:
 2  2 (Unbuildable) | |
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| Refittable Ship Types | |
| Fast Battleship | Battleship |
| Aviation Battleship | Standard Aircraft Carrier |
| Armored Carrier | Light Carrier |
| Heavy Cruiser | Aviation Cruiser |
| Light Cruiser | Torpedo Cruiser |
| Training Cruiser | Destroyer |
| Coastal Defense Ship | Submarine |
| Aircraft Carrying Submarine | Seaplane Tender |
| Fleet Oiler | Submarine Tender |
| Repair Ship | Amphibious Assault Ship |
Introduction
紅茶の国で建造された海防戦艦に搭載された、副砲装備です。
同砲を搭載装備した海防戦艦は、列強の海洋艦隊を構成する艦と比較すると大きく見劣りする部分もありますが、二基の主砲と両舷に本砲含む副砲を複数装備したその姿は、まさに小さな小さな戦艦といえる威容を誇りました。
This is a secondary gun armament, mounted on a coastal defense battleship built in the country of tea.
While the coastal defense battleships equipped with these guns were significantly inferior to the ships that made up the naval fleets of the major powers, their appearance, with two main guns and multiple secondary guns including these cannons on both sides, boasted an imposing presence that could truly be described as a miniature battleship.
Mechanics
Secondary Guns
Sec Sp_Sec serve a similar role to Main Guns. Their main stats are the "firepower" 
and "accuracy" 
. They are notably required to trigger some weaker Artillery Spotting attacks as well as some Night Cut-Ins, notably the "Double Attack" (DA).
- They do not have any "Hidden Penalties" on any ships.
- They bring an accuracy bonus against PT boats.
Notes
How To Obtain
Stock equipment of:
- Base: Norge
, Eidsvold
- Kai+: Norge Kai
, Eidsvold Kai
Event reward for:
- Fall 2025 Event E-1: Hard (★+8), Medium (★+7), Easy (★+3)
Updates History
- 2025-10-29: Implemented
Fit Bonuses
| 15cm Single Secondary Gun Mount Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement |
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Fusou-class  Norge-class Yuubari Base/Kai  
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(★0-6) | +1 | +2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★7) | +2 | +2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★8) | +2 | +3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★9) | +3 | +3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★MAX) | +3 | +4 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (2nd equipped) | +2 | +1 | +1 | One-time | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Additional synergy with: 21cm Single Main Gun Mount
Improvement
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| Improvement | Not Upgradable | |||||
| ★ Improvement Level |
0~5 | 6~9 | ||||
 Consumed
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3/4 | 4/5 | ||||
 Consumed
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1/1 | 1/3 | ||||
| Equipment Consumed |
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x3
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| Items Consumed |
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| Resources |  10  40  70  0
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| Ship Helper | Conversion | |||||
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 Eidsvold/Kai |
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| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
Improvement  effects
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1★ | 2★ | 3★ | 4★ | 5★ | 6★ | 7★ | 8★ | 9★ | Max★ |
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0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 |
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0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 |
| Day
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1.00 | 1.41 | 1.73 | 2.00 | 2.23 | 2.44 | 2.64 | 2.82 | 3.00 | 3.16 |
| Night
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1.30 | 1.84 | 2.25 | 2.60 | 2.91 | 3.18 | 3.44 | 3.68 | 3.90 | 4.11 |