RECTANGULAR STEEL TUBE SIZES AND DIMENSIONS
Rectangular steel tubes (also known as rectangular hollow structural sections or rectangular HSS) sizes, dimensions and section properties are given in the following chart per
Steel Construction Manual.
Rectangular steel tubes have an rectangular cross section except for rounded corners. Rectangular steel tubes are designated by "HSS", overall outside dimension (in.), and wall thickness.
HSS10x8x5/8 is nominally 10 in. by 8 in. with a 5/8 in. wall thickness.
Moment of inertia, elastic section modulus, radius of gyration, torsional moment of inertia and plastic section modulus values are given by the following calculator for the selected rectangular steel tube size.
Calculator:

OUTPUT PARAMETERS 
Parameter 
Symbol 
Value 
Unit 
Shape 
 


 
Depth 
h 


in 
Width 
b 


Design wall thickness* 
t_{des} 


Nominal weight 
w 


lb/ft 
Area 
A 


in^{2} 
b/t 
 


 
h/t 
 


 
Second moment of area about X axis 
I_{X} 


in^{4} 
Elastic section modulus about X axis 
S_{X} 


in^{3} 
Radius of gyration about X axis 
r_{X} 


in 
Plastic section modulus about X axis 
Z_{X} 


in^{3} 
Second moment of area about Y axis 
I_{Y} 


in^{4} 
Elastic section modulus about Y axis 
S_{Y} 


in^{3} 
Radius of gyration about Y axis 
r_{Y} 


in 
Plastic section modulus about Y axis 
Z_{Y} 


in^{3} 
Workable flat depth 
h_{flat} 


in 
Workable flat width 
b_{flat} 


Polar moment of area 
J 


in^{4} 
Torsional constant for HSS shapes 
C 


in^{3} 
The total surface area of a square HSS section per feet 
A_{surf} 


ft^{2}/ft 
Note: Use dot "." as decimal separator.
Note *:The design wall thickness t, shall be used in calculations involving the wall thickness of hollow structural sections (HSS) per Steel Construction Manual Section B3.12.
Definitions:
Second Moment of Area: The
capacity of a crosssection to resist bending.
Radius of Gyration (Area): The
distance from an axis at which the area of a body may be assumed to be
concentrated and the second moment area of this configuration equal to the
second moment area of the actual body about the same axis.
Section Modulus: The moment of
inertia of the area of the cross section of a structural member divided by the
distance from the center of gravity to the farthest point of the section; a
measure of the flexural strength of the beam.
Reference: