| IADC WOB (KN/mm) | RPM (r/min) | Applicable Formations |
|---|---|---|
| 417/437/447/415/435 0.35~0.9 |
150~70 | Very soft formations with low compressive strength and high drillability |
| 517/527/515 0.35~1.0 |
140~60 | Soft formations with low compressive strength and high drillability |
| 537/547/535 0.45~1.0 |
120~50 | Soft to medium formations with low compressive strength |
| 617/615 0.45~1.1 |
90~50 | Medium hard formation with high compress strength |
| 637/635 0.5~1.2 |
80~40 | Hard formations with high compressive strength |
| Size | 6 1/2" |
| IADC Code | 637 |
| Thread | 3 1/2REG |
| Dimension | 205*205*350(mm) |
| Teeth Type | Standard Type |
| Back Cone Feature | Single Row |
| Sealed Protection | Enhanced Type |
| N.W/G.W(KG) | 17/18 |