
| 鋼管種類 | 鋼管尺寸 /mm | 允許偏差 | ||
| 普通級 | 高  級 | |||
| 熱軋(擠壓擴)管 | 外徑D | <50 | ±0.50mm | ±0.40mm | 
| ≥50 | ±1% | ±0.75% | ||
| 壁厚S | <4 | ±12.5%(最小值為±0.40mm) | ±10%(最小值為±0.30mm) | |
| ≥4-20 | +15% -12.5% | ±10% | ||
| >20 | ±12.5% | ±10% | ||
| 冷拔(軋)管 | 外徑D | 6-10 | ±0.20mm | ±0.10mm | 
| >10-30 | ±0.40m | ±0.20mm | ||
| >30-50 | ±0.45mm | ±0.25mm | ||
| >50 | ±1% | ±0.5% | ||
| 壁厚S | ≤1 | ±0.15mm | ±0.12mm | |
| >1-3 | +15% -10% | ±10% | ||
| >3 | +12.5 -10% | ±10% | ||