The IS-6 may not seem like a tank with a great deal of armor by looking at it’s listed stats. However, it’s armor scheme makes good use of angles and provides excellent protection overall which can fool a lot of people who do not know how to deal with one. Although the armor is angled across the front, sides, and rear of the IS-6 most of its armor is still concentrated on the front of the IS-6. Keep in mind that the IS-6’s armor is mainly based around the effective armor values after angling since locations without angling are very weak due to the lack of thick armor on the IS-6.
This guide for World of Tanks IS-6 weak spots breaks down its armor into individual locations based on armor thickness/angle which gives the true effective armor value. The index at the bottom of each picture describes a few abbreviations used and also the format in which the armor details are described in. Effective Armor (EA) refers to the overall effectiveness of the armor without normalization.
Frontally the IS-6 is a formidable foe to come across for most tier 8 tanks and lower. Most of the frontal hull armor is difficult to penetrate due to it being heavily angled and a lot of the weakest weak spots are located on the turret which is more difficult to hit. On the frontal hull you have the lower frontal glacis(LFG) that is only has 199mm effective armor. For tier 6 and tier 7 tanks facing the IS-6 frontally you will want to focus on the lower glacis or turret weak spots. There are several weak spots between 150mm and 165mm effective armor which are easy to damage found on the turret. Otherwise if you have a 90mm or larger gun you can overmatch the roof of the IS-6 with ease.
World of Tanks IS-6 Weak Spots Side View
While the side armor is still angled decently the thickness drops enough to where almost the entire side is weak enough for most tanks that regularly face the IS-6 to penetrate it. The exception is a few small locations on the front of the IS-6’s side hull and also a few small spots on the turret. Some tier 6 and 7 tanks might struggle with reliably penetrating a couple areas if you get a low penetration roll but otherwise the IS-6’s side armor is easy to damage.
World of Tanks IS-6 Weak Spots Rear View
Much like the side armor the rear armor on the IS-6 is very weak and easy to damage as long as you avoid the tougher spots on the rear turret.