Rectangular Tubes

Rectangular hollow sections are not as common as UCs and UBs. This is down to the fact that it is much more difficult to bolts it to other beams or to bolt other members to it. RHSs are described by their depth, width and wall thickness. An example is a 200 x 100 x 8 RHS, which is 200 mm deep, 100 mm wide and the wall is 8 mm thick. Hot rolled RHSs are made at the mill as one piece, whereas cold formed RHSs are made of a flat sheet rolled at right angles and welded. It is therefore easy to note the difference, as the cold rolled RHSs 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