320mm armor for Bismark vs 305mm (thickest) to 160mm armor for the HMS Hood. Bismark was nearly 20 years newer with a far more efficient design. Even then, th

320mm armor for Bismark vs 305mm (thickest) to 160mm armor for the HMS Hood. Bismark was nearly 20 years newer with a far more efficient design. Even then, the extra 3000 tons of armor makes a difference.