AISC


About Sizes & Grades

Below is a detailed table of the dimensions for each shape as well as an explanation of designating and searching by grade.

Dimensions

Shape 1st Dimension 2nd Dimension 3rd Dimension
C Nominal depth in inches Weight per foot in pounds  
HP Nominal depth in inches Weight per foot in pounds  
HSS Rectangular Length of longest side in inches Length of second side in inches Nominal wall thickness in fractional inches
HSS Round Diameter in decimal inches Nominal wall thickness in decimal inches (three decimal points)  
HSS Square Length of first side in inches Length of second side in inches Nominal wall thickness in fractional inches
L Length of longest leg in inches Length of shortest leg in inches Thickness in fractional inches
M Nominal depth in inches Weight per foot in pounds  
MC Nominal depth in inches Weight per foot in pounds  
S Nominal depth in inches Weight per foot in pounds  
W Nominal depth in inches Weight per foot in pounds  

Grades

W and all HSS shapes are available to view and search by grade. Available grade listings are:

  • HSS : A1085 & A500
  • W: A709, A913 & A992

For more information on grades, see Table 2-4 which is reproduced below from the 15th Edition Steel Construction Manual.
You can also read more in Modern Steel Construction's SteelWise article Are You Properly Specifying Materials? and in the SteelDay webinar on the same topic.