Structural Shapes

Listed on the following pages are shapes commonly carried in stock. The American Iron and Steel Institute has established a designation system for structural shapes, which has been adopted by steel producers. In the column headed "AISI Designation", a letter or letters precedes the size and weight per foot. For example, C3 X 4.1 is the AISI designation for a 3" x 4.1# Standard Structural Channel.

"W" shapes are doubly-symmetric wide flange shapes used as beams or columns whose inside flange surfaces are substantially parallel. 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.

"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. The essential part of these standards is that the inside flange surfaces of American Standard beam shapes have approximately a 16 2/3% slope.

"M" shapes are doubly-symmetric shapes that cannot be classified as "W", "S", or bearing pile shapes. (Although not included in the standard nomenclature tabulation, bearing piles are doubly-symmetric wide flange shapes whose inside flange surfaces are essentially parallel and whose flange and web have essentially the same thickness.)

"C" shapes are channels produced in accordance with dimensional standards adopted in 1896 by the Association of American Steel Manufacturers for American Standard channels. The essential part of these standards is that the inside flange surfaces of American Standard channels have approximately a 16 2/3% slope.

"MC" shapes are channels that cannot be classified as "C" shapes.

Stocked in Lengths up to 60'
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AISI Designation

Estimated Weight per Foot

Estimated Weight 20-Ft. Length

Estimated Weight 30-Ft. Length

Estimated Weight 40-Ft. Length

Estimated Weight 60-Ft. Length

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N/A 25.0 lb N/A 500 lb N/A 750 lb N/A 1000 lb N/A 1500
N/A 25.4 lb N/A 508 lb N/A 762 lb N/A 1016 lb N/A 1524
N/A 28.5 lb N/A 570 lb N/A 855 lb N/A 1140 lb N/A 1710
N/A 31.0 lb N/A 620 lb N/A 930 lb N/A 1240 lb N/A 1860
N/A 31.8 lb N/A 636 lb N/A 954 lb N/A 1272 lb N/A 1908
N/A 33.6 lb N/A 672 lb N/A 1008 lb N/A 1344 lb N/A 2016
N/A 35.0 lb N/A 700 lb N/A 1050 lb N/A 1400 lb N/A 2100
N/A 37.0 lb N/A 740 lb N/A 1110 lb N/A 1480 lb N/A 2220
N/A 40.0 lb N/A 800 lb N/A 1200 lb N/A 1600 lb N/A 2400
N/A 42.7 lb N/A 854 lb N/A 1281 lb N/A 170.8 lb N/A 2562
N/A 45.0 lb N/A 900 lb N/A 1350 lb N/A 1800 lb N/A 2700
N/A 45.8 lb N/A 916 lb N/A 1374 lb N/A 1832 lb N/A 2748
N/A 50.0 lb N/A 1000 lb N/A 1500 lb N/A 2000 lb N/A 3000
N/A 50.0 lb N/A 1000 lb N/A 1500 lb N/A 2000 lb N/A 3000
N/A 51.9 lb N/A 1038 lb N/A 1557 lb N/A 2076 lb N/A 3114
N/A 58.0 lb N/A 1160 lb N/A 1740 lb N/A 2320 lb N/A 3480
N/A 6.5 lb N/A 130 lb N/A 195 lb N/A 260 lb N/A 390
N/A 7.1 lb N/A 142 lb N/A 213 lb N/A 284 lb N/A 426
N/A 8.4 lb N/A 168 lb N/A 252 lb N/A 336 lb N/A 504
N/A 8.5 lb N/A 170 lb N/A 255 lb N/A 340 lb N/A 510
N/A 10.6 lb N/A 212 lb N/A 318 lb N/A 424 lb N/A 636
N/A 12.0 lb N/A 240 lb N/A 360 lb N/A 480 lb N/A 720
N/A 13.8 lb N/A 276 lb N/A 414 lb N/A 552 lb N/A 828
N/A 15.3 lb N/A 306 lb N/A 459 lb N/A 612 lb N/A 918
N/A 16.3 lb N/A 326 lb N/A 489 lb N/A 652 lb N/A 978
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