Roller cone bit 269.9 642Y (10 ⅝" 642)

The bit is designed for drilling of medium-hard and hard abrasive rock formations, e.g. quartzeous sandstone with lime cement, magnesite, ferrous quartzite, diorite, quartzeous porphyry, silicized shale, fine-grained skarn, weak pegmatite, martite ore and metamorphic granite rocks, fine-grained diorite and diabase, most frequently found in gold and copper 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 24 000 to 44 000 PSI.

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Bit diameter, mm 269.9
Bit diameter, inch 10 ⅝
Bit designation, IADC 642Y
Connection thread, API 6 ⅝" REG
Bearing type Air-cooled, on rolling bearings
Formation type For medium-hard and hard abrasive formations
Rotation speed. RPM 115-60
Max. applicable load, kN 120-230
Weight, kg 65.0
Bearing/cooling type Roller – Ball – Roller / Air cooling
Blow-through type Side / center
Cutting structure Tungsten carbide inserts