Mild Steel Box Section

Mild steel square hollow section (box section) available in 2.5mm and 5mm wall thickness, in sizes from 20x20mm up to 100x100mm. Sold in 1 metre and 2 metre lengths. Suitable for structural frames, gates, trailers, furniture, and general fabrication. All S275 mild steel, fully weldable. Dispatched within 1 working day.

Not sure which finish to choose?

We stock fasteners in three finishes to suit every application. BZP is ideal for indoor and sheltered use. HDG gives heavy-duty protection for outdoor, structural, and timber work. A4 Grade 316 Stainless is the right choice for marine, coastal, and chemical environments. Read our guide to pick the right finish for your project.

Read the finish guide

Same-day dispatch — free delivery over £60

Orders placed before 2pm are dispatched the same working day via tracked courier. Free standard UK delivery on orders over £60. All fasteners are manufactured to DIN and ISO standards in Grade 4.8 and 8.8 steel — competitively priced for trade and domestic buyers, with no minimum order.

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