Armor thickness
The nominal thickness of a plate in millimetres, before any angle is taken into account.
Also known as armour, armor, nominal armor, plate thickness.
Every specification sheet quotes three figures, front, side and rear, for the hull and for the turret. They are the raw thickness of the plate, measured straight through.
On its own the number says very little. A 100 millimetre plate laid at 60 degrees stops more than a 200 millimetre plate standing vertical, so the interesting figure is always the effective thickness at the angle a shell actually meets it.
Related terms
Effective armorThe thickness a shell actually has to defeat once the angle of the plate is accounted for, which is what penetration is compared against.AnglingTurning a vehicle so incoming shells meet its plates at an angle, multiplying effective armor without changing a single stat.Weak spotA part of a vehicle noticeably thinner than the armor around it, where a gun that cannot defeat the front can still get through.PenetrationHow much armor a shell can defeat, in millimetres, rolled plus or minus 25 percent on every shot and compared against the effective thickness it hits.