Mild Steel Rectangular Hollow Section RHS – S235, 7.5m Lengths & Cut to Size, Rectangular Steel Box Section Tube for Frames & Fabrication

Our S235 mild steel rectangular hollow section (RHS) — also called rectangular box section or box steel — is supplied in full 7.5m lengths or cut to size on request, in sizes from 50x25mm up to 200x100mm and wall thicknesses from 2mm to 6mm. With unequal sides giving greater strength in one direction, RHS is ideal for beams, lintels, load-bearing frames, trailers and structural fabrication, with a 3-5 working day lead time to mainland UK.

Technical Specification

Rectangular Hollow Section Sizes & Weight Chart

Full S235 rectangular hollow section (RHS) size chart with nominal weight per metre. Every size is available in 7.5m lengths or cut to size.

Popular rectangular hollow section sizes include 50x25, 50x30 and 60x40 RHS for light frames, through 100x50 and 120x60 box section, up to heavy 150x100 and 200x100 rectangular hollow section for beams and load-bearing spans. Weights are nominal mass per metre to EN 10219 — for an exact figure use our metal weight calculator.

Rackerman is a UK steel supplier: buy mild steel rectangular hollow section — also known as RHS, rectangular box section or box steel — online with fast mainland UK delivery and cut-to-size service, a convenient alternative to a local steel stockholder near you.

Common Uses

Rectangular hollow section is widely used for structural beams and lintels, load-bearing frames, trailer chassis, gates, railings, support posts, agricultural buildings, workshop fabrication and general construction. Its unequal sides make it the preferred profile where greater strength is needed across one axis.

Rectangular vs Square Box Section

Rectangular hollow section (RHS) has unequal sides and offers greater bending strength in one direction, making it ideal for beams and load-bearing spans. Square box section (SHS) has equal sides and is preferred for general frames, gates and fabrication. Choose RHS where directional strength matters most.

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 rectangular 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. Always use suitable protective equipment when working steel.

Related Mild Steel Sections

Explore the rest of our mild steel range: angle iron, flat bar, square bar, round bar, box section (SHS) and steel channel. Work out weights with our metal weight calculator.

Compare Our Full Box & Rectangle Section Range

Match the section to your job: square box section (SHS) for general frames, 3m box section for short handling, ERW box & rectangle for thin-wall sizes, galvanised box & rectangle for outdoors, 6063 aluminium box section for light weight and 304 stainless box section for corrosion resistance. See also our circular hollow section (round steel tube) and the full hollow section collection.

Related Guides

Read more in our guides: how to box in a steel beam and the metal weight calculator.

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.