Bright drawn square bar in engineering steel grades — 3mm to 150mm. Precise square section for keys, gibs, couplings and machined components requiring a square profile. Metric and imperial sizes in stock.
Square bar is bright drawn to a square cross-section with precise side dimensions to h9, h10 or h11 tolerance. The square profile is used where a square cross-section is required either by design (keys, gibs) or as a convenient starting form for machined components that retain square external faces.
Woodruff and parallel keys are the most common application — the square bar is cut to length and milled to key form. Square bar is also used for drive couplings, spacers, guides and any component requiring a square profile that would otherwise need to be milled from flat or round bar.
Full tolerance tables by diameter: BS EN 10278 reference ›
Stocked in both metric and imperial sizes. Cut to any length from 1 piece. −0/+2mm standard cut tolerance.
| Grade | BS / EN Designation | Size Range | Condition | Standard |
|---|---|---|---|---|
| EN8 | 080M40 | 16mm–100mm | Bright drawn | BS EN 10278 / h9–h11 |
| EN8D | 080A42 | 16mm–100mm | Bright drawn | BS EN 10278 / h9–h11 |
| EN1A | 230M07 | 8mm–125mm | Bright drawn | BS EN 10278 / h9–h11 |
| EN3B / 080A15 | 070M20 / 080A15 | 8mm–150mm | Bright drawn | BS EN 10278 / h9–h11 |
| S355 | S355J2 | 25mm–100mm | Hot rolled | BS EN 10025 |
All grades listed below are available in square bar. Click any grade for full data sheet, chemical composition and mechanical properties.
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