Size, thickness and price list of BSA black steel tube and hot-dip galvanized steel tube (Specification for Steel Pipe Group of Taiwan Iron and Steel Industry Association)
| Diameter | Outer diameter (mm) | Thickness | ||
|---|---|---|---|---|
| Inch | Max. | Std. | Min. | MM |
| 1″ | 33.8 | 33.5 | 33.2 | 2.45 |
| 1 1/4″ | 42.5 | 42.2 | 41.9 | 2.45 |
| 1 1/2″ | 48.4 | 48.1 | 47.8 | 2.6 |
| 2″ | 60.2 | 59.9 | 59.6 | 2.6 |
| 2 1/2″ | 76 | 75.6 | 75.2 | 3 |
| 3″ | 88.7 | 88.3 | 87.9 | 3 |
| 3 1/2″ | 101.2 | 100.7 | 100.3 | 3.25 |
| 4″ | 113.9 | 113.4 | 113 | 3.25 |
| 5″ | 140.1 | 139.5 | 138.9 | 3.6 |
| 6″ | 165.5 | 164.9 | 164.4 | 3.6 |
＊Thickness tolerance according to CNS 2056 ＋10%，－8%