Model Variants (Including Prototypes)
T-26 - Base Series Designation; based on the British Vickers 6-ton Type E light tank design.
T-26A (T-26 Model 1931) - Initial Production Model Designation.
T-26A-2 - Fitted with two turrets mounting 1 x 7.62mm machine guns each.
T-26A-3 - Fitted with 1 x 12.7mm machine gun and 1 x 7.62mm machine gun.
T-26A-4 - Fitted with 1 x 27mm cannon and 1 x 7.62mm machine gun.
T-26A-4(U) - Command Vehicle; also T-26A-4V.
T-26A-5 - Fitted with 1 x 37mm main gun and 1 x 7.62mm machine gun.
T-26B (T-26 Model 1933) - Single turret design series.
T-26B-1 - Mounting 1 x 37mm main gun
T-26B-2 - Improved T-26B; all-welded construction; improved turret with gun counterweight added at rear.
T-26B-2(U) - Command Vehicle
T-26S Model 1937 - Fitted with 45mm main gun; may also be known as the T-26C or T-26E.
OT-26 - Flamethrowing Tank based on the T-26A model series.
OT-30 - Flamethrowing Tank based on the T-26B model series.
OT-133 - Flamethrowing Tank; based on the T-26S model series.
ST-26 - Bridging Tank; also IT-26.
AT-1 - Converted T-26 into 76.2mm self-propelled gun role.