Mild Steel Circular Hollow Section 7.5m – S235 CHS Steel Tube

Our S235 mild steel circular hollow section (CHS), also known as steel tube, is supplied in full 7.5m lengths in outside diameters from 21.3mm up to 168.3mm and wall thicknesses from 2.5mm to 5mm. With even strength in all directions, CHS is ideal for columns, posts, structural frameworks, handrails and tube fabrication, with a 3-5 working day lead time to mainland UK.

Technical Specification

Common Uses

Circular hollow section is widely used for structural columns and posts, support frames, bracing members, handrails and balustrades, gate and railing fabrication, agricultural structures and general structural tube work. Its round profile gives uniform strength in all directions.

Circular vs Box and Rectangular Section

Circular hollow section (CHS) gives even strength in all directions, ideal for columns, posts and handrails. Square box section (SHS) and rectangular hollow section (RHS) have flat faces that are easier to join and weld for frames and load-bearing spans. Choose CHS where a round profile or uniform strength is required.

Finish and Protection

Supplied in standard mill finish. The surface may show normal mill scale, handling marks or light surface oxidation, typical for untreated steel. For outdoor or moisture-exposed use, clean, prime and protect with a suitable paint or coating system.

Cutting and Fabrication

S235 circular hollow section can be cut, drilled, welded and fabricated using suitable metalworking tools. Cut ends and drilled holes should be protected if used outside or in damp conditions.

Delivery Information

Lead times are currently 3-5 working days. Delivery is kerbside only and our vehicles do not carry HIAB or lifting equipment - steel must be safely offloaded by the customer on arrival. Sections are supplied in full 7.5m lengths, so suitable delivery access is required.

Frequently Asked Questions

What is CHS and how does it differ from ERW tube?
CHS (Circular Hollow Section) is the structural designation for round steel tube manufactured to dimensional and structural standards. ERW describes the welding process. Our CHS is ERW-manufactured to BS EN 10219 in S235 grade.

What diameters are available in 7.5m CHS?
26.9mm to 114mm outside diameter in various wall thicknesses. The 7.5m length gives maximum span between joints for structural and fabrication work.

What is S235 CHS used for?
Structural columns, fence posts, handrails, bollards, framework, roll cages, canopy supports, sign posts and any structural application requiring a round hollow section.

How heavy is 7.5m CHS tube?
Weight depends on diameter and wall thickness. For example, 48.3mm x 3.2mm CHS weighs approximately 3.56 kg/m — so a 7.5m length weighs approximately 26.7 kg. Check the product page for weights per metre.

How is 7.5m CHS delivered?
Delivered within 3-5 working days to mainland UK. 7.5m lengths require suitable access — typically a flatbed delivery vehicle.