![]() ![]() ![]() "M" shapes are doubly-symmetric shapes that cannot be classified as "W", "S", or bearing pile shapes. The essential part of these standards is that the inside flange surfaces of American Standard beam shapes have approximately a 16 2/3% slope. "S" shapes are doubly-symmetric shapes produced in accordance with dimensional standards adopted in 1896 by the Association of American Steel Manufacturers for American Standard beam shapes. A shape having essentially the same nominal weight and dimensions as a "W" shape listed in the tabulation but whose inside flange surfaces are not parallel may also be considered a "W" shape having the same nomenclature as the tabulated shape, provided its average flange thickness is essentially the same shape as the flange thickness of the "W" shape. "W" shapes are doubly-symmetric wide flange shapes used as beams or columns whose inside flange surfaces are substantially parallel. For example, C3 X 4.1 is the AISI designation for a 3" x 4.1# Standard Structural Channel. ![]() In the column headed "AISI Designation", a letter or letters precedes the size and weight per foot. The American Iron and Steel Institute has established a designation system for structural shapes, which has been adopted by steel producers. Listed on the following pages are shapes commonly carried in stock. ![]()
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