Product advantages
Diamond composite drill bit selection reference table
|
Rock |
Hardness category |
Soft |
Medium-soft |
Medium |
Medium-hard |
Hard |
Hard |
|
Drillability level |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
|
Praeter hardness | F≤10
| 10 < F≤15 |
|
Representative rocks |
Sandstone, limestone, marble, dolomite, pyrite, weak granite, shale |
Granite, strong sandstone, conglomerate, limestone, quartz veins |
|
Compact (PDC) scraper type drill bit |
Ordinary type | ♦
| ♦ | ♦ |
♦ |
♦ |
♦ |
♦ | ♦
|
|
|
|
| Reinforced type
| ♦ | ♦ | ♦ |
♦ |
♦ |
♦ |
♦ |
♦ | ♦
|
|
|
|
High-strength type | ♦ | ♦ | ♦ |
♦ |
♦ |
♦ |
♦ |
♦ | ♦
| ♦
| ♦
|
