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10 5/8″ MR425 Tricone Bit
IADC 425 · Φ270mm · 74kg · 6 5/8″ API
Cutting structure & formations
Gage rows: Chisel. Inner rows: Conical. For very soft formations with low compressive strength, high drillability, typically shale, soft limestone, sandstone, conglomerate, soft dolomite, coal ore.
ORIGINAL · EN Chisel on gage, conical on inner rows. Designed for very soft formations with low compressive strengths and high drillability such as shale, soft limestone, sandstone, conglomerate, soft dolomite and coal ore.
Shirttail protection
Hardmetal on shirttail lip; Wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal on shirttail lip; Wear resistant carbide on shirttail lip and lug.
- Diameter 10 5/8″ / Φ270 mm, weight 74 kg
- Connection 6 5/8″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 10,630–21,250 lbs, rotary speed 90–120 rpm
Technical parameters
| Model | MR425 |
|---|---|
| IADC code | 425 |
| Diameter | 10 5/8″ / Φ270mm |
| Thread | 6 5/8″ API |
| Weight | 74 kg |
| Bearing type | Roller-Ball-Roller-Thrust Button/Sealed Bearing |
| Circulation | Jet Air |
| Inner row teeth | Conical |
| Gage row teeth | Chisel |
| Gage bevel protection | Round |
Operating suggestions
Actual parameters must be set per application
| Weight on bit | 10,630–21,250 lbs |
|---|---|
| Rotary speed | 90–120 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 5,000–8,000 Psi |
