THEORETICAL WEIGHTS - ROUNDS All weights are theoretical. They are computed on the basis of the specific gravities of the metals involved. The weights shown would be accurate if steel could always be produced to exact size. This is seldom possible in commercial practice. Accuracy of dimensions, particularly of hot rolled steel products, is influenced by many factors, such as mill design, heating practice, reduction between passes, roll wear, roll pressure, composition of steel and standard tolerances.

Theoretical weights for round sections: 1 to 3 inches 3 to 6 inches 6 to 9 inches  9 to 12 inches 12 to 24 inches 24 to 30 inches