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Dimensional tolerance of erw steel pipe
| Standard | Out Diameter | Tolerance of Pipe End | Tolerance of Pipe Body | Tolerance of Wall Thickness |
| API 5L | 219.1-273.1 | +1.6mm, -0.4mm | ±0.75% |
+15%, -12.5% |
| 274.0-320 | +2.4mm, -0.8mm | ±0.75% | +15%, -12.5% | |
| 323.9-457 | +2.4mm, -0.8mm | ±0.75% | +15%, -12.5% | |
| 508 | +2.4mm, -0.8mm | ±0.75% | +17.5%, -12.5% | |
| 559-610 | +2.4mm, -0.8mm | ±0.75% | +19.5%, -8% |
