The Bethlehem Beam is a strong, lightweight structural beam that forms the framework of buildings, bridges, and other structures. These wide flange beams were first made in 1907 in Bethlehem using inventor Henry Grey's innovative rolling mill. Grey's process used a series of rolls to shape the beam from a single piece of steel. These new Bethlehem Beams made it possible to build taller, stronger, and cheaper. Compared with its great strength, the Bethlehem Beam uses relatively little material, allowing beams to be placed farther apart and reducing weight and material cost. Because of its geometry, it resists bending even under great stress and can support tremendous loads both vertically and horizontally. The Grey Mill's adaptable design also let workers customize the beams by adjusting the position of the rolls.
