管材的最小壁厚ey,min等于公称壁厚en。管材任一点的壁厚公差应符合下表的规定。
| 最小壁厚 | 公差 | 最小壁厚 | 公差 | 最小壁厚 | 公差 | |||
| ＞ | ≤ | ＞ | ≤ | ＞ | ≤ | |||
| | | | 25.0 | 25.5 | 5.0 | 45.0 | 45.5 | 9.0 |
| | | | 25.5 | 26.0 | 5.1 | 45.5 | 46.0 | 9.1 |
| 2.0 | 3.0 | 0.5 | 26.0 | 26.5 | 5.2 | 46.0 | 46.5 | 9.2 |
| 3.0 | 4.0 | 0.6 | 26.5 | 27.0 | 5.3 | 46.5 | 47.0 | 9.3 |
| 4.0 | 4.6 | 0.7 | 27.0 | 27.5 | 5.4 | 47.0 | 47.5 | 9.4 |
| 4.6 | 5.3 | 0.8 | 27.5 | 28.0 | 5.5 | 47.5 | 48.0 | 9.5 |
| 5.3 | 6.0 | 0.9 | 28.0 | 28.5 | 5.6 | 48.0 | 48.5 | 9.6 |
| 6.0 | 6.6 | 1.0 | 28.5 | 29.0 | 5.7 | 48.5 | 49.0 | 9.7 |
| 6.6 | 7.3 | 1.1 | 29.0 | 29.5 | 5.8 | 49.0 | 49.5 | 9.8 |
| 7.3 | 8.0 | 1.2 | 29.5 | 30.0 | 5.9 | 49.5 | 50.0 | 9.9 |
| 8.0 | 8.6 | 1.3 | 30.0 | 30.5 | 6.0 | 50.0 | 50.5 | 10.0 |
| 8.6 | 9.3 | 1.4 | 30.5 | 31.0 | 6.1 | 50.5 | 51.0 | 10.1 |
| 9.3 | 10.0 | 1.5 | 31.0 | 31.5 | 6.2 | 51.0 | 51.5 | 10.2 |
| 10.0 | 10.6 | 1.6 | 31.5 | 32.0 | 6.3 | 51.5 | 52.0 | 10.3 |
| 10.6 | 11.3 | 1.7 | 32.0 | 32.5 | 6.4 | 52.0 | 52.5 | 10.4 |
| 11.3 | 12.0 | 1.8 | 32.5 | 33.0 | 6.5 | 52.5 | 53.0 | 10.5 |
| 12.0 | 12.6 | 1.9 | 33.0 | 33.5 | 6.6 | 53.0 | 53.5 | 10.6 |
| 12.6 | 13.3 | 2.0 | 33.5 | 34.0 | 6.7 | 53.5 | 54.0 | 10.7 |
| 13.3 | 14.0 | 2.1 | 34.0 | 34.5 | 6.8 | 54.0 | 54.5 | 10.8 |
| 14.0 | 14.6 | 2.2 | 34.5 | 35.0 | 6.9 | 54.5 | 55.0 | 10.9 |
| 14.6 | 15.3 | 2.3 | 35.0 | 35.5 | 7.0 | 55.0 | 55.5 | 11.0 |
| 15.3 | 16.0 | 2.4 | 35.5 | 36.0 | 7.1 | 55.5 | 56.0 | 11.1 |
| 16.0 | 16.5 | 3.2 | 36.0 | 36.5 | 7.2 | 56.0 | 56.5 | 11.2 |
| 16.5 | 17.0 | 3.3 | 36.5 | 37.0 | 7.3 | 56.5 | 57.0 | 11.3 |
| 17.0 | 17.5 | 3.4 | 37.0 | 37.5 | 7.4 | 57.0 | 57.5 | 11.4 |
| 17.5 | 18.0 | 3.5 | 37.5 | 38.0 | 7.5 | 57.5 | 58.0 | 11.5 |
| 18.0 | 18.5 | 3.6 | 38.0 | 38.5 | 7.6 | 58.0 | 58.5 | 11.6 |
| 18.5 | 19.0 | 3.7 | 38.5 | 39.0 | 7.7 | 58.5 | 59.0 | 11.7 |
| 19.0 | 19.5 | 3.8 | 39.0 | 39.5 | 7.8 | 59.0 | 59.5 | 11.8 |
| 19.5 | 20.0 | 3.9 | 39.5 | 40.0 | 7.9 | 59.5 | 60.0 | 11.9 |
| 20.0 | 20.5 | 4.0 | 40.0 | 40.5 | 8.0 | 60.0 | 60.5 | 12.0 |
| 20.5 | 21.0 | 4.1 | 40.5 | 41.0 | 8.1 | 60.5 | 61.0 | 12.1 |
| 21.0 | 21.5 | 4.2 | 41.0 | 41.5 | 8.2 | 61.0 | 61.5 | 12.2 |
| 21.5 | 22.0 | 4.3 | 41.5 | 42.0 | 8.3 | | | |
| 22.0 | 22.5 | 4.4 | 42.0 | 42.5 | 8.4 | | | |
| 22.5 | 23.0 | 4.5 | 42.5 | 43.0 | 8.5 | | | |
| 23.0 | 23.5 | 4.6 | 43.0 | 43.5 | 8.6 | | | |
| 23.5 | 24.0 | 4.7 | 43.5 | 44.0 | 8.7 | | | |
| 24.0 | 24.5 | 4.8 | 44.0 | 44.5 | 8.8 | | | |
| 24.5 | 25.0 | 4.9 | 44.5 | 45.0 | 8.9 | | | |