Aluminium Section Sizes and Thickness Guide: 2 × 1, 2.5 × 1.5 and More

The common sizes

• 2 × 1 inch channel (single / double): the standard frame for aluminium partitions, cabins and box frames.
• 2.5 × 1.5 inch section (single / double): the standard for aluminium doors, especially bathroom and partition doors.
• L-angles, E-channels and PA channels: edging, corners, mesh and glazing.
• Sliding window series: 2-track and 3-track frames with matching shutter, interlock and track sections.

Single vs double section

A single section holds a board or glass on one side. A double section has a central web and holds infill on both faces, so it is stiffer. Use double sections for doors and anything over about 7 ft tall.

Thickness (gauge) matters

Two sections that look the same can differ a lot in wall thickness. Thin sections are cheaper but bend, rattle and lose screws over time. 1. Compare weight per length — heavier usually means thicker walls. 2. Check the cut end — the wall should be even all around. 3. Ask for the brand and grade on the bill.

Which finish?

Powder-coated and anodised finishes protect the section and match interiors. We stock Ivory, Black, White, Silver, Brown and Nut Brown.

See all aluminium channels and angles, door sections and plain sections.