Sh-354T: Shrapnel useful against vehicles that are resistant to the HE shell but too thinly armoured to trigger the fuzes of APHE shells.OF-350M: HE useful for breaking the hulls of lightly armoured/unarmoured vehicles.BP-353A: HEAT best penetration beyond 1,000 m, but the T-34s generally do not fare well in long-range duels.BR-354P: APCR best penetrating shell, at the cost of no post-penetration damage.BR-350SP: APBC a solid shot that is somewhat more lethal than APCR, but with less penetration.BR-350B (MD-8 fuze): APHEBC increased penetration at the cost of slightly less explosive mass.BR-350A (MD-5 fuze): APHEBC high explosive mass will knock out any tank it penetrates with a single shot, however penetration is mediocre.The crew are seated in a quite compact manner inside the tank, and successful penetrations are likely to disable multiple crew members at once.

However, the T-34's hull sides are spanned by relatively large fuel tanks thus, side penetrations can cause the diesel fuel to catch fire. The bulk of the T-34's main gun ammunition is carried low in the hull, making it relatively hard to detonate the ammunition of a T-34, especially if it is carrying a reduced ammunition load. Overall, the turret armour is not a significant improvement over the earlier models and is in some ways weaker.

The turret front, side, and rear armour is made of cast armour instead of rolled plate, which is slightly weaker.

The angling is noticeably worse, and there are some relatively flat spots on the front that can be vulnerable to penetrations from even relatively weak guns at close ranges.

The new hexagonal turret features thicker armour than on the 1941 model. It should be noted that due to the relatively thin plate thickness used (40–45 mm), the T-34's hull is vulnerable can be vulnerable to overmatching from 75 mm and larger guns. The driver's hatch has the thickest armour on any part of the T-34 and can be quite resilient to enemy fire if hit. The weak spots created by the driver's optics on earlier models have also been removed. There are two key differences: the machine gun ball mount has an increased thickness of 60 mm of armour (compared to 45 mm on earlier models), as does the driver's hatch (75 mm, compared to 45 mm on earlier models). The 1943 model has a very similar hull armour profile to the 1941 model, relying on angling instead of sheer thickness for protection. Suspensions wheels and tracks are 20 mm thick.Cast homogeneous armour (Turret, Driver's hatch, Machine gun mount).Rolled homogeneous armour (Hull, Turret roof).

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