The Soviet KV-85 heavy tank was a completely modified KV-1S armed with a new turret from the IS tank (that was not ready yet) and an 85 mm main tank gun.

KV-85 (Object 239) – A KV-1S with the 85 mm D-5T cannon in a new turret, with the ball mounted hull machine gun repositioned to the right of driver (now fixed mount) and the hole welded shut; 148 of these tanks were produced in the second half of 1943 until the spring of 1944 as a stopgap until the IS tank series entered production.

The KV-1S saw action at Kursk in 1943, with the 53rd Guards Heavy Tank Brigade. The unit took part in the fighting of 12-14th July that broke the main thrust of the German offensive. Some KV-1Ss are alleged to have taken part in the Berlin offensive, but most had been allocated support duties by that late stage of the war.

在KV-85和IS-1炮塔上安装85mm火炮影响了炮塔的结构，需要增大炮塔尺寸，才能避免乘员工作空间急剧缩小和 作战效能 降低。 但是这样一来，也造成了KV-85和 IS-1重型坦克 的重量增加。

The KV-85 is the heavily modified sixth variant of the KV-1 heavy tank family. It was a stopgap design comprised of a modified KV-1S hull connected to an IS-85 turret and mounted with an 85 mm D-5T tank gun. By the middle of the Second World War, all existing KV-1 variants were considered obsolete.

KV-85: 安装了85mm火炮和IS-1的炮塔的新型号（嚴格來說是過渡型號）。 S-51：在KV-1S的车身上安装203mm榴弹炮的自行火炮。 SU-152：在KV-1S的底盤上安裝152mm榴彈砲的突擊砲。

kv-85就是kv-1的一个重要改进型，也是表现最出色的一种。 KV-85最大的变化就是配备一门D5T型85mm主炮，火力得到大幅提升，可以有效对付当时德军几乎所有的坦克和装甲车辆。

The KV-1S tank, armed with the 85 mm gun S-31 in standard turret. This vehicle is currently preserved in the Museum at Kubinka (see photo below). As early as December 1941, Uralmash Factory recommended the U-12 85 mm gun, developed by designers Sidorenko and Usenko, for arming of the KV tank.

As a consequence, from August 1942, the KV-1s began to be phased out and completely stopped in December, temporarily replacing it with an “intermediate” heavy tank KV-85. Such a large number...

kv-85 影片評論涵蓋了主要車輛特性及其戰鬥表現。 KV-1S 戰車的進一步研發。 不像先前的修改型，KV-85 擁有強化過的武裝。