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41cm Twin Gun Mount

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No.8 41cm連装砲
RedGunHeavy.png Large Caliber Main Gun (41cm)
Effects: Firepower+20 AA+4 RangeLong
Scrap value: Ammo 12 Steel 20 (Buildable)

Equipment Card 41cm Twin Gun Mount.png

Equipment Character 41cm Twin Gun Mount.png

Equipment Item 41cm Twin Gun Mount.png

Equipment Full 41cm Twin 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



Developed by Kure Naval Arsenal's Artillery Division, this is the first entirely domestic battleship gun.
At a little over 16 inches (40.6cm), this 41cm gun was the largest battleship gun in the world until the introduction of the Yamato-class' 46cm guns.
It was equipped on Nagato and Mutsu who it was praised by many fans as two of the great power's "Big 7".


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


Stock equipment of: Fusou Kai NiFusou Kai Ni, Haruna KaiHaruna Kai, Hiei Kai NiHiei Kai Ni, Hiei KaiHiei Kai, Kirishima Kai NiKirishima Kai Ni, Kirishima KaiKirishima Kai, Kongou Kai NiKongou Kai Ni, Kongou KaiKongou Kai, Mutsu Kai NiMutsu Kai Ni, Mutsu KaiMutsu Kai (x2), MutsuMutsu, Nagato Kai NiNagato Kai Ni, Nagato KaiNagato Kai (x2), NagatoNagato, Yamashiro Kai NiYamashiro Kai Ni

From quest: A92 (x2, choice), B129 (x4, choice)


Used to improve: 41cm Twin Gun Mount41cm Twin Gun Mount, 38cm Twin Gun Mount38cm Twin Gun Mount, Prototype 35.6cm Triple Gun MountPrototype 35.6cm Triple Gun Mount, Prototype 41cm Triple Gun MountPrototype 41cm Triple Gun Mount, 38cm Twin Gun Mount Kai38cm Twin Gun Mount Kai, Prototype 46cm Twin Gun MountPrototype 46cm Twin Gun Mount, 381mm/50 Triple Gun Mount Kai381mm/50 Triple Gun Mount Kai, 16inch Triple Gun Mount Mk.716inch Triple Gun Mount Mk.7, 38.1cm Mk.I Twin Gun Mount38.1cm Mk.I Twin Gun Mount, 38.1cm Mk.I/N Twin Gun Mount Kai38.1cm Mk.I/N Twin Gun Mount Kai, 30.5cm Triple Gun Mount30.5cm Triple Gun Mount, 41cm Triple Gun Mount Kai41cm Triple Gun Mount Kai, 38cm Quadruple Gun Mount38cm Quadruple Gun Mount, 38cm Quadruple Gun Mount Kai38cm Quadruple Gun Mount Kai, 51cm Twin Gun Mount51cm Twin Gun Mount, 41cm Triple Gun Mount Kai Ni41cm Triple Gun Mount Kai Ni, 41cm Twin Gun Mount Kai Ni41cm Twin Gun Mount Kai Ni, 16inch Mk.I Twin Gun Mount16inch Mk.I Twin Gun Mount, 16inch Mk.V Twin Gun Mount16inch Mk.V Twin Gun Mount, 16inch Mk.VIII Twin Gun Mount Kai16inch Mk.VIII Twin Gun Mount Kai, 16inch Triple Gun Mount Mk.616inch Triple Gun Mount Mk.6, 16inch Triple Gun Mount Mk.6 mod.216inch Triple Gun Mount Mk.6 mod.2, 16inch Mk.I Triple Gun Mount16inch Mk.I Triple Gun Mount, 16inch Mk.I Triple Gun Mount + AFCT Kai16inch Mk.I Triple Gun Mount + AFCT Kai

Used by quest: F74

Updates History


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
Large Caliber Main Gun 41cm Twin Gun Mount 0 30 350 480 0 3/4 2/3 1xRedGunHeavy.png M M1 M2 M M1 M2 N X M M1 N N Nagato
Mutsu Kai
Mutsu Kai Ni
Upgrades to Prototype 41cm Triple Gun Mount.
6 4/7 3/6 2xRedGunHeavy.png
10 12/20 10/15 2xRedGunHeavy.png
2xItem Icon New Model Gun Mount Improvement Material.png
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


Developed for the IJN's first 'Eight-Eight Fleet Program' in 1910, in which Japan initially intended to build eight battleships and eight armored cruisers. The Washington Naval Treaty of 1922 scrapped the various plans for other ships to carry this gun, leaving the Nagato-class as the sole class. 

See Also

41 cm/45 3rd Year Type naval gun
Eight-Eight Fleet Program