Mild Steel Box Section 3m - S235 Square Hollow Section
Mild Steel Box Section 3m - S235 Square Hollow Section
Elevate your structures with precision-crafted mild steel box sections: versatile sizes, uncompromising strength. Transform your projects with quality you can build on!
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Our S235 mild steel box section is supplied in 3m lengths, in sizes from 20x20mm up to 150x150mm and wall thicknesses from 2mm to 5mm. The 3m length is easy to handle and transport, ideal for DIY, repairs, frames, shelving, gates and general fabrication, with a 3-5 working day lead time to mainland UK.
Technical Specification
| Material | S235 mild steel |
| Profile | Square box section (SHS) - hollow section |
| Length | 3m (full length) |
| Sizes available | 20x20mm up to 150x150mm |
| Wall thicknesses | 2mm - 5mm (size dependent) |
| Finish | Standard mill finish |
| Weldability | Weldable, drillable and easily fabricated |
| Density | 7,850 kg/m3 |
| Lead time | 3-5 working days (mainland UK) |
Common Uses
Mild steel box section is widely used for frames, shelving, gates, railings, brackets, supports, trailers, workbenches, garden structures, workshop fabrication and general metalwork. The 3m length suits smaller projects and easier handling.
3m vs 7.5m Box Section
3m lengths are easier to handle, transport and ideal for DIY and smaller fabrication. 7.5m lengths suit trade and structural projects where fewer joints are an advantage. Both are supplied in the same S235 mild steel.
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 box 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. Mild steel box sections are long, heavy items, so suitable delivery access is required. Offloading assistance may be required on site.

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FREQUENTLY ASKED QUESTIONS
What size box section is available in 3m?
Our 3m mild steel box section is available in sizes from 20x20mm up to 150x150mm, in wall thicknesses from 2mm to 5mm depending on the size. All sections are supplied in 3m lengths in S235 mild steel.
What grade is your box section?
Our box section is supplied in S235 mild steel, a commonly specified general-purpose structural grade suitable for welding, cutting, drilling and fabrication. For exact section properties and tolerances, refer to the applicable mill certificate or BS EN standard for your application.
Should I choose 3m or 7.5m box section?
3m lengths are easier to handle, transport and ideal for DIY projects, repairs and smaller fabrication jobs. For trade, structural or larger fabrication work where fewer joints are an advantage, our 7.5m box section lengths may be more suitable. Both are S235 mild steel.
Can box section be cut and welded?
Yes - S235 box section can be cut, drilled, welded and fabricated using suitable metalworking tools and correct preparation. Cut ends and drilled holes should be protected if the section will be used outside or in damp conditions. Always use suitable protective equipment when working steel.
How is box section delivered?
Lead times are currently 3-5 working days. Mild steel box sections are long, heavy items, so suitable delivery access is required. Offloading assistance may be required on site.
MONEY BACK GUARANTEE
Here at Rackerman, we take customer satisfaction very seriously. If you are unsatisfied with the quality of your product, please email us info@rackerman.co.uk or give us a call: 01665 497513 and we will make it right.
SHIPPING
It should take no longer than 1-2 business day to process your order, then 3-5 working days (5-10 working days on RSJs + Chippings) to then receive your order from us after dispatch.
If you haven't received your items in this time frame, please contact us.
RETURNS
If you are unsatisfied with your purchase, that's completely fine! We offer a 30 day money back guarantee to all customers, no questions asked! Please contact us to arrange a return.
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