Straightness tolerances for copper and copper alloy bars
Straightness tolerances for bars, EN 12164
Deviation from straightness, defined as the curvature (arc depth) relative to a reference straight line when the product is placed on a horizontal surface, according to the table below.
| Maximum deviation from straightness, mm | ||||
|---|---|---|---|---|
| Specified diameter or width across flats | measured over any 400 mm length | over the entire bar length L, in metres (L ≥ 1 m) | ||
| for alloys from Tables 2, 3, 4 and 5 | for alloys from Tables 1 and 6 | for alloys from Tables 2, 3, 4 and 5 | for alloys from Tables 1 and 6 | |
| Round bars | ||||
| from 10 mm up to and including 50 mm | 0.4 | 0.8 | 1.0 × L | 2.0 × L |
| Polygonal bars | ||||
| from 10 mm up to and including 50 mm | 0.6 | 1.2 | 1.5 × L | 3.0 × L |
| NOTE | The straightness tolerances shown in the table apply only to the material conditions specified in this standard. | |||
Table 1 low-alloy copper alloys
Table 2 copper-nickel-zinc alloys
Table 3 copper-tin alloys
Table 4 copper-zinc alloys
Table 5 copper-zinc-lead alloys
Table 6 complex copper-zinc alloys