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Extremely Hard 8xx Tricone Bit
TRICONE DRILL BIT · EXTREMELY HARD · IADC 8xx · 7 models · Φ200–311mm
Extremely Hard 8xx Full specification
7 models, sorted by diameter (small to large)
| Image | Model | Diameter | IADC | Weight on bit | Rotary speed | Air pressure | Top Sub | Weight kg | Details |
|---|---|---|---|---|---|---|---|---|---|
 | 7 7/8″ MR845 | Φ200 | 845 | 39,380–63,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 4 1/2″ API | 34 | View Details → |
 | 8 1/2″ MR835 | Φ216 | 835 | 42,500–68,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 4 1/2″ API | 38 | View Details → |
 | 9″ MR845 | Φ229 | 845 | 45,000–72,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 4 1/2″ API | 50 | View Details → |
 | 9 5/8″ MR832 | Φ244.5 | 832 | 48,125–77,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 6 5/8″ API | 65 | View Details → |
 | 9 7/8″ MR845 | Φ251 | 845 | 49,375–79,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 6 5/8″ API | 65 | View Details → |
 | 11″ MR835 | Φ279 | 835 | 55,000–88,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 6 5/8″ API | 74 | View Details → |
 | 12 1/4″ MR832 | Φ311 | 832 | 61,250–98,000 lbs | 50–80 rpm | 0.2–0.4 MPa | 6 5/8″ API | 98 | View Details → |
Where this series is used
For extremely hard, highly abrasive formations; conical buttons with wear resistance first.
Tricone bits are classified by IADC code: the first digit (4–8) indicates formation hardness from soft to extremely hard, the last two describe cutting structure and bearing design. Several IADC options are available in each size; selection depends on rock type, abrasiveness and rig parameters.