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Round Steel Tubing Sizes and Section Properties (Round HSS)

Round steel tubing (round HSS) sizes, dimensions and section properties chart, including second moment of area, elastic and plastic section moduli, radius of gyration, torsional constants and more.

Round steel tubes are usually manufactured to meet ASTM A500 Grade B (Fy = 42 ksi) or Grade C (Fy = 46 ksi). Round HSS sections have a circular hollow cross-section with uniform wall thickness (except at the weld seam).

Round steel tubes are designated by HSS, nominal outside diameter (inches), and wall thickness. For example, HSS 6.000 × 0.500 is nominally 6 in. in diameter with a 1/2 in. nominal wall thickness.

Input parameters

1. Select HSS outside diameter and wall thickness  →  2. Click Calculate
Nominal round HSS outside diameter in inches.
Available wall thicknesses for the selected round HSS size.

Note: Use a dot “.” as decimal separator.

 

Results – section properties

Geometric properties for the selected round HSS size.
Parameter Value Unit
Basic shape and dimensions
Shape --- –
Design wall thickness [tdes]* --- in
Area and slenderness
Nominal weight [w] --- lb/ft
Area [A] --- in2
D / t --- –
Flexural and torsional section properties
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 a dot “.” as decimal separator.

Note *: The design wall thickness tdes shall be used in calculations involving the wall thickness of hollow structural sections (HSS) per AISC Steel Construction Manual, Section B3.12.

Supplements

Reference