Heavy Tank
VIII
IS-6
11,800
0
150%
110%
5%
100%
IX
175/217/61
390/390/530
1550
35/14
370
420.91/396.81





122 mm D-30
5.45
390/390/530
165/165/165
0/0/2.49
2126
175/217/61
152/204/61
790/988/790
720/720/720
AP/APCR/HE
11
2.7
37
0.42
1.21
6
20
-180/180
IS-6
190/150/100
24
370
primary
V-12 A
700
13.59
35
14
15
IS-6
26
1.2/1.5/2.3
10RKM
730
Developed in the summer of 1944 by the Construction Bureau of the Kirov Plant (Leningrad). In the fall of the same year, the prototype underwent trials. It never entered mass production nor saw service.