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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Size (A x B x C)

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 15.3 lb N/A 306 lb N/A 459 lb N/A 612 lb N/A 918
N/A 20.0 lb N/A 400 lb N/A 600 lb N/A 800 lb N/A 1200
N/A 25.0 lb N/A 500 lb N/A 750 lb N/A 1000 lb N/A 1500
N/A 30.0 lb N/A 600 lb N/A 900 lb N/A 1200 lb N/A 1800
N/A 20.7 lb N/A 414 lb N/A 621 lb N/A 828 lb N/A 1242
N/A 25.0 lb N/A 500 lb N/A 750 lb N/A 1000 lb N/A 1500
N/A 30.0 lb N/A 600 lb N/A 900 lb N/A 1200 lb N/A 1800
N/A 33.9 lb N/A 678 lb N/A 1017 lb N/A 1356 lb N/A 2034
N/A 40.0 lb N/A 800 lb N/A 1200 lb N/A 1600 lb N/A 2400
N/A 50.0 lb N/A 1000 lb N/A 1500 lb N/A 2000 lb N/A 3000
N/A 4.1 lb N/A 82 lb N/A 123 lb N/A 164 lb N/A 246
N/A 5.0 lb N/A 100 lb N/A 150 lb N/A 200 lb N/A 300
N/A 6.0 lb N/A 120 lb N/A 180 lb N/A 240 lb N/A 360
N/A 5.4 lb N/A 108 lb N/A 162 lb N/A 216 lb N/A 324
N/A 6.25 lb N/A 125 lb N/A 188 lb N/A 250 lb N/A 375
N/A 7.25 lb N/A 145 lb N/A 218 lb N/A 290 lb N/A 435
N/A 6.7 lb N/A 134 lb N/A 201 lb N/A 268 lb N/A 402
N/A 9.0 lb N/A 180 lb N/A 270 lb N/A 360 lb N/A 540
N/A 10.5 lb N/A 210 lb N/A 315 lb N/A 420 lb N/A 630
N/A 13.0 lb N/A 260 lb N/A 390 lb N/A 520 lb N/A 780
N/A 8.2 lb N/A 164 lb N/A 246 lb N/A 328 lb N/A 492
N/A 12.25 lb N/A 245 lb N/A 368 lb N/A 490 lb N/A 735
N/A 14.75 lb N/A 295 lb N/A 443 lb N/A 590 lb N/A 885
N/A 9.8 lb N/A 196 lb N/A 294 lb N/A 392 lb N/A 588
N/A 11.5 lb N/A 230 lb N/A 345 lb N/A 460 lb N/A 690
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