Metal Face sealed TCI Drill Bit IADC437 8 1/2" (215mm or 216mm) is for soft formation well drilling. 1>8 1/2"(215mm or 216mm) is a regular size in deep well drilling like oil and gas well drilling, and it is also a regular size in horizontal directional pilot hole drilling. The thread connection is 4 1/2 API REG PIN. 
| Basical Specification | |
| Size of Rock Bit | 8.5 inches |
| 215.90 mm | |
| Bit Type | TCI Tricone Bit |
| Thread Connection | 4 1/2 API REG PIN |
| IADC Code | IADC 437G |
| Bearing Type | Journal Sealed Bearing with Gauge Protection |
| Bearing Seal | Elastomer/Rubber |
| Heel Protection | Available |
| Shirttail Protection | Available |
| Circulation Type | Mud Circulation |
| Drilling Condition | Rotary drilling,high temp drilling,deep drilling,motor drilling |
| Total Teeth Count | 80 |
| Gage Row Teeth Count | 33 |
| Number of Gage Rows | 3 |
| Number of Inner Rows | 7 |
| Jounal Angle | 33° |
| Offset | 8 |
| Operating Parameters | |
| WOB (Weight On Bit) | 17,077-49,883 lbs |
| 76-222KN | |
| RPM(r/min) | 300~60 |
| Recommended upper torque | 16.3-21.7KN.M |
| Formation | Soft formation of low crushing resistance and high drillability. |
