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41cm Triple Gun Mount Kai 2

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No.290 41cm三連装砲改二
RedGunHeavy.png Large Caliber Main Gun (41 cm)
Effects: Firepower+23 AA+6 Accuracy+5 RangeLong
Scrap value: Ammo 20 Steel 22 Bauxite 6 (Unbuildable)

Equipment Card 41cm Triple Gun Mount Kai 2.png

Equipment Character 41cm Triple Gun Mount Kai 2.png

Equipment Item 41cm Triple Gun Mount Kai 2.png

Equipment Full 41cm Triple Gun Mount Kai 2.png

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



An improved version of a triple main battery for purely domestic battleships that was developed at the artillery department of the Kure Naval Arsenal.
Although it is a what-if version, it is a gun with reduced weight and improved fire control system, turning it into a battleship main armament optimized for aviation battleships, especially the Ise-class aviation battleships.
The Ise-class Kai Ni in particular, after undergoing its large-scale remodel, will show its full potential.


Main GunsSmall Caliber Main GunMedium Caliber Main GunLarge Caliber Main Gun are the main armament used by surface ships. Their main stats are the "firepower" Firepower and "accuracy" Accuracy. They are notably required to trigger all Artillery Spotting attacks as well as some Night Cut-Ins, notably the "Double Attack" (DA).


How To Obtain

Upgradeable from: 41cm Triple Gun Mount Kai41cm Triple Gun Mount Kai

From quest: F74

Ranking reward for:

  • Apr 2018: 1-5 (★+4), 6-20 (★+4), 21-100, 101-500
  • Dec 2018: 1-5, 6-20

Updates History

  • 2018-05-29: Implemented as ranking reward
  • 2018-06-13: Became improvable

Fit Bonuses

41cm Triple Gun Mount Kai 2 Equipment Bonuses
Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Accuracy Evasion Note
Hyuuga Kai NiHyuuga Kai Ni - +3 +2 +3 +2
+ Air Radar +2 +3 One-time
Ise Kai NiIse Kai Ni - +3 +2 +3 +1
+ Air Radar +2 +3 One-time
Ise KaiIse Kai
Hyuuga KaiHyuuga Kai
- +2 +2 +1
+ Air Radar +2 +3 One-time
Fusou Kai NiFusou Kai Ni
Yamashiro Kai NiYamashiro Kai Ni
- +1

Additional synergy with: 41cm Twin Gun Mount Kai 241cm Twin Gun Mount Kai 2


RedGunHeavy.png 41cm Triple Gun Mount Kai 2

Improvement Not
★ Improvement
0~5 6~9
Development material Consumed 8/10 14/41
Improvement material Consumed 7/7 10/13
Equipment Card 41cm Twin Gun Mount.pngx3 Equipment Card Prototype 41cm Triple Gun Mount.png
Resources Fuel45 Ammunition460 Steel720 Bauxite50
Ship Helper Conversion
Ship Banner Ise Kai Ni.png
Ise Kai Ni
Mon Tue Wed Thu Fri Sat Sun
Improvement Improved effects
Large Caliber Main Gun 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 1.50 2.12 2.59 3.00 3.35 3.67 3.96 4.24 4.50 4.74
Night Battle Power 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Day 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Night 1.30 1.84 2.25 2.60 2.91 3.18 3.44 3.68 3.90 4.11

See Also