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7 7/8″ MR535 Tricone Bit
IADC 535 · Φ200mm · 34kg · 4 1/2″ API
Cutting structure & formations
Gage rows: Conical. Inner rows: Conical. For hard formations with high compressive strength.
ORIGINAL · EN Chisel on gage, conical on inner rows. Designed for soft formations with low compressive strengths such as shale, soft limestone, dolomite with interlayers and coal ore.
Shirttail protection
Hardmetal on lug; Wear resistant carbide on shirttail lip and lug.
ORIGINAL · EN Hardmetal on lug; Wear resistant carbide on shirttail lip and lug.
- Diameter 7 7/8″ / Φ200 mm, weight 34 kg
- Connection 4 1/2″ API, bearing Roller-Ball-Roller-Thrust Button/Sealed Bearing
- WOB 15,750–39,380 lbs, rotary speed 80–110 rpm
Technical parameters
| Model | MR535 |
|---|---|
| IADC code | 535 |
| Diameter | 7 7/8″ / Φ200mm |
| Thread | 4 1/2″ API |
| Weight | 34 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 | 15,750–39,380 lbs |
|---|---|
| Rotary speed | 80–110 rpm |
| Air back pressure | 0.2–0.4 MPa |
| Formation strength | 15,000–23,000 Psi |
