# ROUND STEEL TUBE SIZES AND DIMENSIONS (ROUND HSS)

Round steel tubes sizes, dimensions and section properties are given in the following chart per Steel Construction Manual.

Round steel tubes are usually manufactured to meet ASTM A500 grade B (Fy = 42 ksi) or grade C (Fy = 46 ksi). Round steel tubes have an round and uniform wall thickness, except at the weld seam(s). Round steel tubes are designated by "HSS", nominal outside diameter (in.), and wall thickness. HSS 6.000 x 0.500 is nominally 6 in. in diameter with a 1/2 in. nominal 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 round steel tube size.

### Round Steel Tubes Sizes, Dimensions and Section Properties Calculator:

 INPUT PARAMETERS HSS Outside Dimension HSS Wall Thickness HSS 20.000 HSS 18.000 HSS 16.000 HSS 14.000 HSS 12.750 HSS 10.750 HSS 10.000 HSS 9.625 HSS 8.625 HSS 7.625 HSS 7.500 HSS 7.000 HSS 6.875 HSS 6.625 HSS 6.000 HSS 5.563 HSS 5.500 HSS 5.000 HSS 4.500 HSS 4.000 HSS 3.500 HSS 3.000 HSS 2.875 HSS 2.500 HSS 2.375 HSS 1.900 HSS 1.660

 RESULTS Parameter Value Shape --- --- Design wall thickness [tdes]* --- in Nominal weight [w] --- lb/ft Area [A] --- in2 D/t --- --- Second moment of area [I] --- in4 Elastic section modulus [S] --- in3 Radius of gyration [r] --- in Plastic section modulus [Z] --- in3 Polar moment of area [J] --- in4 Torsional constant for HSS shapes [C] --- in3

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 cross-section 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.