eng
eng
The following is range of roller cone bits for blast hole drilling with blow-through with air or air-water mixture. The bits are equipped with tungsten carbide cutting structure from world's leading manufacturers, sturdy elements of roller bearing carrier and hull protection, and have high drilling performance rate: stable high speed and bearing unit resistance.
| Bit diameter | Bit designation | Connection thread | Rock type | |
|---|---|---|---|---|
| inch | MM | IADC CODE | API 7-2 | |
| 6 ¾ | 171.4 | 522X | 3 ½" REG | Side / center |
| 6 ¾ | 171.4 | 622X | 3 ½" REG | Side / center |
| 6 ¾ | 171.4 | 632Y | 3 ½" REG | Side / center |
| 6 ¾ | 171.4 | 642X | 3 ½" REG | Side / center |
| 6 ¾ | 171.4 | 732Y | 3 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 412X | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 422X | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 512X | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 522X | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 542X | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 612X | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 622Y | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 632Y | 4 ½" REG | Side / center |
| 7 ⅞ | 200.0 | 722Y | 4 ½" REG | Side / center |
| 8 ½ | 215.9 | 422X | 4 ½" REG | Side / center |
| 8 ½ | 215.9 | 522X | 4 ½" REG | Side / center |
| 8 ½ | 215.9 | 542X | 4 ½" REG | Side / center |
| 8 ½ | 215.9 | 612X | 4 ½" REG | Side / center |
| 8 ½ | 215.9 | 622Y | 4 ½" REG | Side / center |
| 8 ½ | 215.9 | 632Y | 4 ½" REG | Side / center |