Black Iron Flat Bar
Black Iron Flat Bar — solid flat bar for brackets, straps, base plates, frames and general fabrication. Stocked across common widths and thicknesses in 6-metre lengths, cut-to-length on request.
Sold per length. Brand and stock confirmed on your quote.
Specifications
| Material | Black iron (uncoated mild steel) |
| Standard | ASTM A53 / BS 1387 |
| Widths | 1/2" to 3" |
| Thickness | 3 mm to 10 mm |
| Form | Solid flat |
| Length | 6.0 m standard · cut-to-length |
Description
Black iron flat bar is mild-steel bar of rectangular cross-section — flat, with a black mill finish — used extensively for frames, braces, brackets, straps, gate and grille work, base plates and general fabrication. Its simple flat shape is endlessly useful: easy to cut, drill, bend and weld into whatever a fabricator needs. It is one of the most-reached-for stock materials in any steel shop.
Flat bar is supplied in a range of widths and thicknesses in standard lengths. The right combination of width and thickness depends on the load and how the piece will be used — a bracing strap and a structural bracket call for very different sections. Confirm the sizes and thicknesses available in the specifications below.


