Home / Products / Tricone / Medium-Hard 6xx / 9 7/8″ MR645
9 7/8″ MR645 Tricone Bit
IADC 645 · Φ251mm · 65kg · 6 5/8″ API
Cutting structure & formations
Gage rows: Conical. Inner rows: Conical. For medium-hard formations with high compressive strength, typically shales, limestones, dolomites, chert.
ORIGINAL · EN Conical on gage, conical on inner rows. Designed for medium-hard and abrasive formations with high compressive strengths such as shales, limestones, dolomites and chert.
Shirttail protection
Hardmetal and wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal and wear resistant carbide on shirttail lip and lug.
- Diameter 9 7/8″ / Φ251 mm, weight 65 kg
- Connection 6 5/8″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 29,625–59,250 lbs, rotary speed 60–100 rpm
Technical parameters
| Model | MR645 |
|---|---|
| IADC code | 645 |
| Diameter | 9 7/8″ / Φ251mm |
| Thread | 6 5/8″ API |
| Weight | 65 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Conical |
| Gage row teeth | Conical |
| Gage bevel protection | Flat-top |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 29,625–59,250 lbs |
|---|---|
| Rotary speed | 60–100 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 29,000–38,000 Psi |
