All BA-64 hulls were of all-welded steel construction and varied in armour thickness from 15mm on the hull front to 6mm on the hull sides.[3] To provide maximum ballistic protection, most armour plates were angled at approximately 30°.[2] Both the driving and engine compartments were located at the front of the hull.[3] The crew members are seated in tandem, with the turret gunner seated behind and above the driver.[2] The driving compartment is fitted with a one-piece hatch cover opening upwards.[3] When the hatch is closed during combat, the driver continues to navigate via a triplex auxiliary sight. The sight was developed from a similar device on the T-60 light tank.[2]