Northern Fasteners
Mild Steel Box Section 2.5mm Wall | Square Hollow Section SHS — Various Sizes & Lengths
Mild Steel Box Section 2.5mm Wall | Square Hollow Section SHS — Various Sizes & Lengths
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Mild steel square hollow section (SHS) with 2.5mm wall thickness — a versatile structural steel profile used in construction, fabrication, engineering, and DIY projects. Available in a range of cross-section sizes from 20x20mm up to 50x50mm, in 1 metre and 2 metre lengths.
All sections are mild steel and can be cut, welded, drilled, and painted. Suitable for frames, supports, gates, trailers, furniture, and general fabrication work.
Specifications
- Wall thickness: 2.5mm
- Material: mild steel (S275)
- Lengths: 1 metre and 2 metre
- Sizes: 20x20mm, 25x25mm, 30x30mm, 40x40mm, 50x50mm
- Finish: mill scale (uncoated)
Suitable for
- Structural frames and supports
- Gates, railings, and fencing fabrication
- Trailers and vehicle bodywork
- Furniture and shelving
- General engineering and DIY projects
Frequently asked questions
What is box section used for?
Mild steel box section is one of the most widely used structural steel profiles. It's strong, rigid, and easy to weld — making it ideal for frames, supports, gates, trailers, and fabrication work where a hollow square tube is needed.
What's the difference between 2.5mm and 5mm wall?
The 2.5mm wall is lighter and suitable for most general fabrication at moderate loads. The 5mm wall version is heavier duty for higher strength or impact resistance.
Can it be cut to a custom length?
Our sections are sold in 1m and 2m lengths. Contact us if you need a specific cut length.
Is it weldable?
Yes — mild steel box section is highly weldable using MIG, TIG, or stick welding.
Does it need painting?
Sections are supplied with a mill scale finish. For outdoor use, prime and paint or apply a rust inhibitor.
Delivery
Dispatched within 1 working day. Free delivery on orders over £60. Lengths over 1.5m may require pallet delivery — contact us to confirm before ordering.
Complete your order
Northern Fasteners stocks everything you need for a complete, matched assembly. Always pair your fasteners with the same finish throughout — BZP with BZP, HDG with HDG, A4 stainless with A4 stainless — for consistent corrosion protection and a professional result. Browse our full range of hex nuts, washers, threaded rods, and bolt and nut sets to find everything you need.
BZP, HDG or A4 Stainless — which finish do you need?
Choosing the right finish is just as important as choosing the right size. BZP is ideal for indoor and sheltered use. HDG provides heavy-duty corrosion protection for outdoor, structural, and timber applications. A4 Grade 316 Stainless is the choice for marine, coastal, and chemical environments where no rust is acceptable. Read our guide to help you decide.
Why buy from Northern Fasteners?
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Same-day dispatch
Orders placed before 2pm are dispatched the same working day via tracked courier.
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Free delivery over £60
Free standard UK delivery on all orders over £60. Tracked and reliable.
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DIN & ISO standards
All fasteners are manufactured to DIN and ISO standards. Grade 4.8 and 8.8 as standard.
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Trade & domestic
Competitive pricing for both trade buyers and domestic projects. No minimum order.
Free delivery over £60 — same-day dispatch
Orders placed before 2pm are dispatched the same working day. Spend over £60 and get free standard UK delivery via tracked courier. All our fasteners are manufactured to DIN and ISO standards — properly graded, reliably finished, and competitively priced for trade and domestic buyers alike.
Also need mild steel?
We stock a full range of structural mild steel sections alongside our fasteners — angle iron, box section, flat bar, tube, round bar, and more. Whether you're building a gate, a frame, or a fabrication project, we have the steel and the fasteners to go with it, all in one order.