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20.3cm Twin Gun Mount

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No.6 20.3cm連装砲
RedGunMedium.png Medium Caliber Main Gun
Effects: Firepower+8 AA+3 RangeMedium
Scrap value: Ammo 3 Steel 4 (Buildable)

Equipment Card 20.3cm Twin Gun Mount.png

Equipment Character 20.3cm Twin Gun Mount.png

Equipment Item 20.3cm Twin Gun Mount.png

Equipment Full 20.3cm 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



The 20.3cm twin-gun was the main armament of heavy cruisers.
With a caliber at the maximum allowed by the Treaty of 8 inches (20.3cm), it has sufficient power for medium-range combat and close-range night battle brawls.
It also has limited anti-air capabilities.


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: Aoba KaiAoba Kai, AobaAoba, Ashigara KaiAshigara Kai, AshigaraAshigara, Atago KaiAtago Kai, AtagoAtago, Chikuma KaiChikuma Kai, ChikumaChikuma, Choukai KaiChoukai Kai, ChoukaiChoukai, Furutaka KaiFurutaka Kai, FurutakaFurutaka, Haguro KaiHaguro Kai, HaguroHaguro, Kako KaiKako Kai, KakoKako, Kinugasa KaiKinugasa Kai, KinugasaKinugasa, Kumano KaiKumano Kai, KumanoKumano, MayaMaya, MikumaMikuma, Mogami KaiMogami Kai, Myoukou KaiMyoukou Kai, MyoukouMyoukou, Nachi KaiNachi Kai, NachiNachi, Suzuya KaiSuzuya Kai, SuzuyaSuzuya, Takao KaiTakao Kai, TakaoTakao, Tone KaiTone Kai, ToneTone


Used to improve: 20.3cm Twin Gun Mount20.3cm Twin Gun Mount, 203mm/53 Twin Gun Mount203mm/53 Twin Gun Mount, 8inch Triple Gun Mount Mk.98inch Triple Gun Mount Mk.9, 8inch Triple Gun Mount Mk.9 mod.28inch Triple Gun Mount Mk.9 mod.2

Used by quest: F96, F97

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
Medium Caliber Main Gun 20.3cm Twin Gun Mount 0 10 90 120 0 1/2 2/3 - K K K Aoba
Can be upgraded to 20.3cm(no.2) Twin Gun Mount
6 2/3 2/3 1
10 2/5 4/10 2
Improvement Improved effects
Medium Caliber Main Gun 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Firepower 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
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


Equipped as standard main guns for all Japanese heavy cruisers. Initially, it was developed as the 20.0cm single mount (as seen on early Furutaka-class cruisers) but was later modified to fit 8.0 inches (20.3cm).

See Also

20 cm/50 3rd Year Type naval gun