| Black stee rould pipe | |||||||
| Grade | Outer Diameter | Diameter Tolerance | Wall Thickness | Thickness Tolerance | Length | Length Tolerance | |
| Q195 Q235 Q345 | inch | mm | mm | mm | mm | m | mm |
1/2 | 20 | +/-0.5 | 0.6-3.0 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 3/4 | 25 | +/-0.5 | 0.6-3.25 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 25.4 | +/-0.5 | 0.6-3.5 | +/-0.1mm | 3.0-12.0 | -0, +20 | ||
| 1 | 32 | +/-0.5 | 0.7-3.75 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 38 | +/-0.5 | 0.7-3.75 | +/-0.1mm | 3.0-12.0 | -0, +20 | ||
| 1-1/4 | 40 | +/-0.5 | 0.7-3.75 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 42 | +/-0.5 | 0.7-3.75 | +/-0.1mm | 3.0-12.0 | -0, +20 | ||
| 1-1/2 | 47 | +/-0.5 | 1-4.0 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 48 | +/-0.5 | 1-4.0 | +/-0.1mm | 3.0-12.0 | -0, +20 | ||
| 2 | 59 | +/-0.5 | 1-8.0 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 60.3 | +/-0.5 | 1-8.0 | +/-0.1mm | 3.0-12.0 | -0, +20 | ||
| 2-1/2 | 75 | +/-0.5 | 1-11.5 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 3 | 87 | +/-0.5 | 1-12 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
| 4 | 113 | +/-0.5 | 1-12.75 | +/-0.1mm | 3.0-12.0 | -0, +20 | |
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