| Outside diameter of the body on a main length, mm |
185 |
| Outside diameter along the centralizers' lines, mm |
212 |
| Max. diameter of the extensible blades, mm |
380 |
| The underreamer length, mm |
1570 |
| Recommended axled pressure, t |
3...5 |
| Recommended flushing fluid rate, l/sec |
22…38 |
| Recommended pressure drop, atm. |
30…45 |
| Recommended rotary speed, RPM |
60…80 |
| Coupling thread GOST (box) |
GOST-28487-90
З-147 |
API
51/2 FH |
| Demands to the spinner and pump set |
drill rig of BU-3000 class not less |
