The beams are manufactured using a standard wide-flange steel beam that is cut in half longitudinally using a circular- or hexagonal-shaped web cut. The two halves are separated, staggered, and welded ...

A second Grey mill was built in 1918, enabling Bethlehem to expand its line of beams by adding smaller and lighter wide-flange shapes. By 1922, with a capacity of 650,000 tons a year, the ...

It is primarily designed for indoor service. It can run on an I-beam or wide flange beam with lower flange from 3… in. to 8 in. with a 1 in. thick maximum. It can navigate curves down to a 60 in.