Free cut-to-size — no limits, no charges Enter your exact length on any product page. You pay for the steel, never for the cut.

RSJ Steel Beams & Columns

RSJ Steel Beams & Columns - Rackerman
UK supplier, VAT registered Rackerman Ltd · company no. 14654664
Free UK mainland delivery Our own vehicles, kerbside
Wrong item? We put it right Wrong size, section or finish — replaced
S355J0 structural steel Graded to BS EN 10025-2
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RSJ steel beams and universal columns cut to size to any length — S355J0 UB & UC in mill finish or red oxide, with free mainland UK delivery and trade discounts on bulk orders. Cut to length and delivered UK-wide with a 5–10 working day lead time.

All beam and column sizes must be specified by a qualified structural engineer before ordering.

Not sure what size you need? Our free RSJ Beam Size Guide covers all standard UK sections with span guidance, section comparisons and a weight calculator. View the RSJ Beam Size Guide →

Need a beam size not listed?

We can source any standard Universal Beam or Universal Column section to BS EN 10365 in S355J0 grade, cut to your required length.

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RSJ steel beams and universal columns cut to size to any length — S355J0 UB and UC sections in mill finish or red oxide primer, with free mainland UK delivery and trade discounts on bulk orders. Every section is cut to your exact requirement at no extra charge. Not sure which size you need? Start with our RSJ beam size guide.

This collection brings together our structural steel sections for UK building, construction and renovation projects — universal beams, universal columns, mill finish RSJs and red oxide RSJs in commonly used sizes for openings, extensions, loft conversions, garage openings and general structural support.

RSJ is often used as a general term for structural steel beams, although many modern steel sections are technically universal beams or universal columns. The correct section size, grade, length and finish must always be confirmed by a qualified structural engineer before ordering.

RSJ Steel Beams and Columns for UK Building Projects

Structural steel beams and columns are used to support loads in domestic, commercial and trade construction projects. They are commonly specified for wall removals, house extensions, roof support, floor support, steel frames and other load-bearing work.

All sections are supplied in S355J0 structural steel to BS EN 10025-2 — see our steel grades and standards guide for the difference between S275 and S355.

Available Steel Sections

Common Uses

  • House extensions
  • Load-bearing wall openings
  • Loft conversions
  • Garage openings
  • Floor and roof support
  • Steel frame projects
  • Building renovations
  • Trade and contractor work

Universal Beams and Universal Columns

Universal beams are typically used as horizontal structural members to span openings and support loads. Universal columns are often used vertically as posts or columns, but they can also be specified in other structural applications depending on the engineer’s design.

Both beam and column sizes must be selected based on the load, span, bearing requirements and installation details for the specific project. Our RSJ size guide sets out the standard UK section sizes and how they compare.

Mill Finish and Red Oxide Options

Mill finish steel is supplied in its standard untreated steel finish. It is suitable where the steel will be painted, treated, enclosed or finished separately.

Red oxide RSJs are supplied with a primer coating. Red oxide can provide a prepared surface for further painting and short-term surface protection, but it should not be treated as a permanent anti-corrosion system. For outdoor or exposed steelwork, a suitable final coating system may be required.

Cut to Size — Free of Charge

Every beam and column is cut to your exact length at no additional cost. Enter the length you need on any product page and the price updates automatically — you pay for the steel, never for the cut. Cut-to-size steel is made to your specification and is non-returnable unless faulty.

Structural Steel Notice

All RSJ beams and columns must be specified by a qualified structural engineer. Beam size, column size, load capacity, bearing length, padstones, connections and installation method depend on the individual project.

Rackerman does not provide structural design advice and cannot confirm whether a specific beam or column is suitable for your opening, span or load requirement.

Delivery Information

RSJ beams and steel columns are heavy items and require suitable delivery access. Offloading assistance is required on site. Lead times are currently 5–10 working days — early bookings get priority. See how our RSJ steel beams are delivered, or read the full delivery and lead times policy.

Order RSJ Steel Beams and Columns Online

Browse our RSJ steel beams and columns below and select the section type, finish, size and length required for your project. For best results, order using the exact specification provided by your structural engineer. Buying in volume? Trade discounts are available on bulk orders, or send us your cutting list for a quote.

FAQ

What size RSJ do I need for a wall removal or opening?

The correct RSJ size depends on the span of the opening, the load above it, the bearing length and your specific structural requirements. A qualified structural engineer must calculate and specify the correct beam size, grade and bearing details for your project. Rackerman supplies RSJ beams and universal sections to engineer specification — we cannot advise on sizing.


What is the difference between a universal beam (UB) and a universal column (UC)?

Universal beams (UB) are designed primarily as horizontal structural members to span openings and support loads from above. Universal columns (UC) have a stockier profile and are typically used as vertical posts or columns, though they can be specified horizontally depending on the engineer's design. Both are supplied in S355 structural steel and available in mill finish or red oxide primer.


What does mill finish and red oxide mean on RSJ beams?

Mill finish steel is supplied in its natural untreated state straight from the rolling mill — suitable where the beam will be enclosed, painted or treated on site. Red oxide RSJs are coated with a rust inhibiting primer before dispatch, providing short-term surface protection and a prepared surface for further painting. Red oxide is not a permanent anti-corrosion system and additional coating is required for exposed or outdoor steelwork.

Do I need a structural engineer for an RSJ beam?

Yes — all structural steel beams used in load-bearing applications must be specified by a qualified structural engineer. This includes wall removals, loft conversions, extensions, garage openings and any other structural application. Your engineer will confirm the correct beam size, grade, bearing length, padstone requirements and connection details. Building regulations approval will also typically be required.


What are the lead times and delivery details for RSJ beams?

RSJ steel beams and universal columns are currently available on a 5–10 working day lead time — early bookings get priority. Beams are heavy items delivered by flat-bed lorry and offloading assistance is required on site. Please ensure suitable access is available for delivery. Orders are delivered to mainland UK addresses.