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Special Type 4 Amphibious Tank Kai

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Type 4 Ka-Tsu Mk.1
No.526 特四式内火艇改
Special Amphibious Tank Icon.png Special Amphibious Tank
Effects: Torpedo+3 AA+2 Accuracy+1
Provides bonuses against installations
Affects various resources mechanics
Scrap value: Fuel 3 Ammo 4 Steel 4 Bauxite 7 (Unbuildable)

Equipment Card Special Type 4 Amphibious Tank Kai.png

Equipment Character Special Type 4 Amphibious Tank Kai.png

Equipment Item Special Type 4 Amphibious Tank Kai.png

Equipment Full Special Type 4 Amphibious Tank Kai.png

Refittable Ship Types
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



This is an improved version of the "Special Type 4 Amphibious Tank" amphibious combat vehicle, developed by the Japanese Navy.
The problematic air-cooled diesel engine has been replaced, tracks and water navigation mobility have been improved, and in addition to the main armament, torpedoes, it is equipped with rockets for anti-ship and anti-aircraft use, as well as ammunitions for reloading.
Enhanced with improved communication capabilities between ships and units, the Special Type 4 Kai will carry out the surprise attack "Operation Tasumaki"!
Let the Sixth Fleet's victory song echo in the enemy's atoll anchorage at dawn!


Special Type 4 Amphibious Tank Kai is an Amphibious Vehicle Amphibious Vehicle:

  • It deals adequate damage against installations, being a good component for "nukes" (see Anti-Installation).
  • It also allows Submarines to participate in the shelling phase against Installations, by launching the tank in battle.
  • It has an extra bonus against PT Imps.

Uniquely on "Atoll Nodes", it is possibly to deploy the Amphibious Vehicle Ka-Tsu tanksSpecial Type 4 Amphibious Tank
Special Type 4 Amphibious Tank Kai
to trigger a special Opening Torpedo Salvo.

  • On those nodes, regular oTorp will not work,
  • This can only be deployed by SS, SSV, and the AV Mikuma Kai Ni Toku, Nisshin A, and Mizuho Kai fast,
    • They must carry at least one Ka-Tsu tank,
  • On the "atoll node", ships meeting those requirements will carry out a special opening torpedo attack,
  • In night battle, those ships will additionally trigger the same attack as a cutin,
    • This attack overrides regular Night Cut-ins attacks (e.g. if a ship is setuped for a TCI, it will still trigger the Ka-Tsu attack).
  • Using several Ka-Tsu tanks on a same ship will make it carry out several of those attacks in a row (day and night),
    • It capped at 2 attacks per ship at night.
    • This attack utilizes a new special animation, with the tank climbing the atoll's soil.

Can be equipped in the RE of I-36, I-41, I-47 Kai, and I-58 Kai.


This equipment is often referred to by its official Japanese name "Ka-Tsu".

Not to be confused with other "Landing Equipment/Tanks" (see here).

How To Obtain

Event reward for:

Updates History

  • 2024-03-01: Implemented

Fit Bonuses

Special Type 4 Amphibious Tank Kai/Bonuses


Improvement Improved effects
Amphibious Vehicle 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
A1 1 + (Average Improved /50)
C [1 + (Average Improved /50)]N
Expedition Bonus 1 + (Average Improved /100)
Has some observed bonus on some special Resource Nodes gains

See Also

Type 4 Ka-Tsu