In 1940, Mariupol Ilyich Iron and Steel Works produced 50 sets of hinged homogeneous armor for the BT-7M, which increased the weight of the test tank to 18 tons.
1940年，Mariupol Ilyich Iron and Steel Works厂为BT-7M生产了50套铰接均值装甲，此装甲将实验车重量增值18吨。