美國進口BCSG螺紋規BCSG是一種石油螺紋
| BUTTRESS CASING | ||
| 名義尺寸 | 牙數/inch | 錐度 |
| 4-1/2 | 5 | 3/4 |
| 5 | 5 | 3/4 |
| 5-1/2 | 5 | 3/4 |
| 5-3/4 | 5 | 3/4 |
| 6-5/8 | 5 | 3/4 |
| 7 | 5 | 3/4 |
| 7-5/8 | 5 | 3/4 |
| 8-5/8 | 5 | 3/4 |
| 9-5/8 | 5 | 3/4 |
| 10-3/4 | 5 | 3/4 |
| 11-3/4 | 5 | 3/4 |
| 13-3/8 | 5 | 3/4 |
| 16 | 5 | 1 |
| 18-5/8 | 5 | 1 |
| 20 | 5 | 1 |
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