# 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:

 INPUT PARAMETERS HSS Outside Dimension HSS Wall Thickness HSS 20 x 12 HSS 20 x 8 HSS 20 x 4 HSS 18 x 6 HSS 16 x 12 HSS 16 x 8 HSS 16 x 4 HSS 14 x 10 HSS 14 x 6 HSS 14 x 4 HSS 12 x 10 HSS 12 x 8 HSS 12 x 6 HSS 12 x 4 HSS 12 x 3 1/2 HSS 12 x 3 HSS 12 x 2 HSS 10 x 8 HSS 10 x 6 HSS 10 x 5 HSS 10 x 4 HSS 10 x 3 1/2 HSS 10 x 3 HSS 10 x 2 HSS 9 x 7 HSS 9 x 5 HSS 9 x 3 HSS 8 x 6 HSS 8 x 4 HSS 8 x 3 HSS 8 x 2 HSS 7 x 5 HSS 7 x 4 HSS 7 x 3 HSS 7 x 2 HSS 6 x 5 HSS 6 x 4 HSS 6 x 3 HSS 6 x 2 HSS 5 x 4 HSS 5 x 3 HSS 5 x 2 1/2 HSS 5 x 2 HSS 4 x 3 HSS 4 x 2 1/2 HSS 4 x 2 HSS 3 1/2 x 2 1/2 HSS 3 1/2 x 2 HSS 3 1/2 x 1 1/2 HSS 3 x 2 1/2 HSS 3 x 2 HSS 3 x 1 1/2 HSS 3 x 1 HSS 2 1/2 x 2 HSS 2 1/2 x 1 1/2 HSS 2 1/2 x 1 HSS 2 1/4 x 2 HSS 2 x 1 1/2 HSS 2 x 1

 OUTPUT PARAMETERS Parameter Symbol Value Unit Shape --- --- --- Depth h --- in Width b --- Design wall thickness* tdes --- Nominal weight w --- lb/ft Area A --- in2 b/t --- --- --- h/t --- --- --- Second moment of area about X axis IX --- in4 Elastic section modulus about X axis SX --- in3 Radius of gyration about X axis rX --- in Plastic section modulus about X axis ZX --- in3 Second moment of area about Y axis IY --- in4 Elastic section modulus about Y axis SY --- in3 Radius of gyration about Y axis rY --- in Plastic section modulus about Y axis ZY --- in3 Workable flat depth hflat --- in Workable flat width bflat --- Polar moment of area J --- in4 Torsional constant for HSS shapes C --- in3 The total surface area of a square HSS section per feet Asurf --- ft2/ft

##### 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.