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DRILLING TOOLS · ROTARY DRILLING TOOLS
Air-lift reverse-circulation roller bit
Roller-cone bit for air-lift reverse-circulation drilling of large-diameter holes in moderately to weakly weathered rock.
| DiameterD · mm | Body diameterD1 · mm | Overall heightH · mm | Body heightH1 · mm | Body wall thicknessT1 · mm | Roller cutterspcs |
|---|---|---|---|---|---|
| Φ800 | 650 | 2100 | 1200 | 20 | 6 |
| Φ1000 | 850 | 2100 | 1200 | 20 | 6 |
| Φ1200 | 1050 | 2400 | 1500 | 20 | 8 |
| Φ1500 | 1350 | 2400 | 1500 | 25 | 8 |
| Φ1800 | 1650 | 2600 | 1700 | 25 | 10 |
| Φ2000 | 1850 | 2600 | 1700 | 25 | 12 |
| Φ2200 | 2050 | 2600 | 1700 | 30 | 12 |
| Φ2500 | 2350 | 2600 | 1700 | 30 | 14 |
| Φ3000 | 2850 | 2600 | 1700 | 30 | 16 |
9 catalogue sizes from Φ800 to Φ3000 mm, each with body diameter, overall height and body height. Catalogue values; dimensions in mm unless stated. Other sizes on request.
Overview
Roller cones on the bit face break the rock by rolling and crushing, while compressed air injected into the drill pipe lifts water and cuttings up the inside of the string. The hole bottom is cleared continuously, so the cones keep working on fresh rock.
It is the tool of choice where large-diameter piles are socketed into weathered rock and the contractor runs a reverse-circulation set-up.
Applications
How to order
To order, give us the diameter from the table, your rig make and model, and the Kelly bar connection. We reply by email within one business day.