Square Steel Tube, Square Steel Pipe 

Square hollow sections are often used for columns, however similarly to RHS sections, they are not often used as beams due to its shape that makes it difficult to bolt to other beams and vice versa. SHSs are often called “box sections”. An example is 100 x 100 x 10 SHS, which is 100 mm deep, 100 mm wide and the wall is 10 mm thick. Similarly to RHS sections, hot rolled SHSs are made at the mill as one piece, whereas cold formed SHSs are made of a flat sheet rolled at right angles and welded. It is therefore easy to note the difference, as the cold rolled SHSs have a weld all along its length.

Surface Conditions                                          Special Features 

Hot Rolled                                                         Hard to find sizes
Hot Rolled Pickled and Oiled                                 Mitre cutting
Cold Rolled                                                        High strength steel on request
KleenKote                                                          Mult lengths

Standard Corner Radius(Mechanical Sizes:) 

Standard Corner Radius(Structural Sizes:) 

Max. 3 x Nominal Wall Thickness

Straightness
Mechanical Sizes: Max. 1/16" in 3 feet
Structural Sizes: Max. 1/8" x Number of feet of total length divided by 5

Wall Thickness
Mechanical & Structural Sizes: ± 10% of Nominal Wall Thickness

Squareness of Sides
Mechanical Sizes: Max: ± b = c x 0.006"
                        b = Tolerance for out-of-square
                        c = Largest external dimension across flats
Structural Sizes: Adjacent sides may deviate from 90 ° by ± 2 °

Maximum Twist (Mechanical & Structural Sizes) 

Convexity & Concavity(Mechanical & Structural Sizes) 

Structural Tubing A 500 Requirements