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Roller cone bit 250.8 732Y (9 ⅞" 732)

The bit is designed for drilling of hard abrasive rock formations, e.g. granite-porphyry, silicized limestone, magnetite and hematite-magnetite hard ore, ferrous, monolithic and thick quartzite, medium-grained diorite, thick garnet skarn, quartzeous gneiss, diabase and basalt, emery chlorite ore, weak pegmatite and quartzeous magnesite, most frequently found in gold, iron and granite mines.
Recommended drilling parameters for maximum efficiency of the bit: low and medium rotation speed (60-115 RPM) and axial load from 120 to 230 kN.
Rock strength range - from 38 000 to 60 000 PSI.
Download technical specifications
Bit diameter, mm:
Bit diameter, inch:
9 ⅞
Bit designation, IADC:
Connection thread, API:
4 ½" FH
Bearing type:
Air-cooled, on rolling bearings
Formation type:
For medium-hard and hard abrasive formations
Rotation speed. RPM:
Max. applicable load, kN:
Weight, kg:
Bearing/cooling type:
Roller – Ball – Roller / Air cooling
Blow-through type:
Side / center
Cutting structure:
Tungsten carbide inserts