The unflatness across the strip (also called cross camber and cross bow) is expressed as a percentage of the strip width. The unflatness along the strip, sometimes called coil-set, is also expressed as a percentage. Unless otherwise agreed upon the measuring length = the strip width for flatness measurements along and across the strip. Influence of possible residual stresses from slitting shall be excluded.
| Tolerance | Maximum permitted deviation class(% of nominal strip width) | |
| P0 | - | |
| P1 | 0.4 | |
| P2 | 0.3 | |
| P3 | 0.2 | |
| P4 | 0.1 | |
| P5 | As per customer`s special requirement | |
| Tolerance class | Strip Width | |||||||||||||||
| 8 - (20) mm | 20 - (50) mm | 50 - (125) mm | 125mm~ | |||||||||||||
| Measuring length | ||||||||||||||||
| 1m | 3m | 1m | 3m | 1m | 3m | 1m | 3m | |||||||||
| Maximum allowed straightness deviation (mm) | ||||||||||||||||
| R1 | 5 | 45 | 3.5 | 31.5 | 2.5 | 22.5 | 2 | 18 | ||||||||
| R2 | 2 | 18 | 1.5 | 13.5 | 1.25 | 11.3 | 1 | 9 | ||||||||
| R3 | 1.5 | 13.5 | 1 | 9 | 0.8 | 7.2 | 0.5 | 4.5 | ||||||||
| R4 | 1 | 9 | 0.7 | 6.3 | 0.5 | 4.5 | 0.3 | 2.7 | ||||||||
| R5 | As per customer`s special requirement | |||||||||||||||
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