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15.5cm Triple Secondary Gun Mount

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No.12 15.5cm三連装副砲
YellowGun.png Secondary Gun
Effects: Firepower+7 AA+3 Accuracy+2 RangeMedium
Scrap value: Ammo 2 Steel 5 (Buildable)

Equipment Card 15.5cm Triple Secondary Gun Mount.png

Equipment Character 15.5cm Triple Secondary Gun Mount.png

Equipment Item 15.5cm Triple Secondary Gun Mount.png

Equipment Full 15.5cm Triple Secondary Gun Mount.png

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



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.


Secondary GunsSecondary GunSecondary High-Angle GunSecLarge Secondary High-Angle GunSp_Sec serve a similar role to Main Guns. Their main stats are the "firepower" Firepower and "accuracy" Accuracy. They are notably required to trigger some weaker Artillery Spotting attacks as well as some Night Cut-Ins, notably the "Double Attack" (DA).

Can be equipped in the RE of certain ships.


How To Obtain


Stock equipment of: Haruna KaiHaruna Kai, Hiei KaiHiei Kai, Kirishima KaiKirishima Kai, Kongou KaiKongou Kai, MusashiMusashi, YamatoYamato

From quest: C66 (x2, choice)


Used to improve: 15.5cm Triple Secondary Gun Mount15.5cm Triple Secondary Gun Mount, 15.5cm Triple Secondary Gun Mount Kai15.5cm Triple Secondary Gun Mount Kai, 15.5cm Triple Gun Mount Kai15.5cm Triple Gun Mount Kai, 15.2cm Triple Gun Mount15.2cm Triple Gun Mount

Updates History

Fit Bonuses

Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Evasion Note
+1 +1 Accuracy+1
+ 15m Duplex Rangefinder + Type 21 Radar Kai Ni15m Duplex Rangefinder + Type 21 Radar Kai Ni OR 15m Duplex Rangefinder Kai + Type 21 Radar Kai Ni + Skilled Fire Direction Center15m Duplex Rangefinder Kai + Type 21 Radar Kai Ni + Skilled Fire Direction Center +1 Accuracy+1, One-time


Type Name Resource Day 2nd Ship Note
Fuel Ammunition Steel Bauxite Item Icon Development Material.png Item Icon Improvement Material.png # of equipment needed for that upgrade. An asterisk following the number indicates a different equipment is required. Sun Mon Tue Wed Thu Fri Sat
Secondary Gun 15.5cm Triple Gun Mount (Secondary) 0 10 90 120 0 2/2 2/3 - M X X X X Y
Musashi Kai Ni can NOT improve this gun.
Upgrades to 15.5cm Triple Gun Mount Kai (Secondary).
6 2/3 2/4 1xYellowGun.png
10 8/12 4/8 2xYellowGun.png
1xItem Icon New Model Gun Mount Improvement Material.png
Improvement Improved effects
Secondary Gun 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Night Battle Power 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Accuracy 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16


According to here, the Mogami-class and eventually the Tone-class were supposed to have the gun, but when the practical use was seen in Yamato-class and Oyodo, 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 degrees for AA firing on top of the main 45 degrees 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 (Fuso-class to Nagato-class).

See Also

15.5cm/60 3rd Year Type Naval Gun