Tier Tool
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China First Grade Drill bit
1. Pls show which size do you want to drill?
The size accords as the diameter of hole which you want to drill.
2. Which thread of drill pipe do you need?
Normal is API 2 3/8“REG thread, 2 3/8”IF, API 3 1/2"REG thread, API 2 7/8"IF thread, NC23, NC26, NC31 thread etc. It accords the thread of your drill pipe.
| No. | inch | mm | mm | thread | mm |
|---|---|---|---|---|---|
| 1 | 2.875 | 73 | 3000 | API 2 3/8’’REG | 55/50 |
| 2 | 3 | 76 | 3000 | API 2 3/8’’REG | 55/50 |
| 3 | 3.5 | 89 | 3000 | API NC26 | 70/50 |
| 4 | 3.5 | 89 | 3000 | API NC26 | 70/50 |
| 5 | 4 | 102 | 3000 | API NC31 | 85/50 |
| 6 | 4.25 | 108 | 3000 | API NC31 | 85/50 |
| 7 | 4.5 | 114 | 3000 | API NC31 / API NC35 | 90/50 |
| 8 | 5 | 127 | 3000 | API NC38 | 100/50 |
