Model Variants (Including Prototypes)
Ki-43 - Designation for prototypes and evaluation models.
Ki-43-Ia - Fitted with 2 x 7.7mm Type 97 machine guns.
Ki-43-Ib - Fitted with 1 x 12.7mm Ho-103 machine gun and 1 x 7.7mm Type 97 machine gun.
Ki-43-Ic - Fitted with 2 x 12.7mm Ho-103 machine guns.
Ki-43-II - Designation used for improved prototype and developmental models.
Ki-43-IIa - Provision added for 500kg of external ordnance.
Ki-43-IIb - Equipped with Radio Communications Capability.
Ki-43-II-KAI - Modified Ki-43-II series with ejector exhaust stacks.
Ki-43-III - Prototype Models fitted with Nakajima Ha-115-II powerplants of 1,230 horsepower.
Ki-43-IIIa - Main Production Designation
Ki-43-IIIb - Fitted with 20mm cannons
Ki-62 (Project) - Advanced Interceptor Model; improved powerplant; 40mm cannons.
Mark I - Japanese Army Designation of Ki-43-Ia model series.
Mark Ib - Japanese Army Designation of Ki-43-Ib model series.
Mark Ic - Japanese Army Designation of Ki-43-Ic model series.
Mark 2a - Japanese Army Designation of Ki-43-IIa model series.
Mark 2b - Japanese Army Designation of Ki-43-IIb model series.
Mark 3a - Japanese Army Designation of Ki-43-III model series.