Roller cone bit 215.9 832Z (8 ½" 832)

The bit is designed for drilling of extra hard abrasive rock formations, e.g. thick quartzite, extra hard siliceous shale, metabasalt of basalt group, granite-porphyry, massive porphyrite, corundum ore, nephrite and titanium-magnetite coherent rocks, and also pyriteous massive hornfels, 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 90 to 200 kN.
Rock strength range - from 55 000 to 66 000 PSI.

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Bit diameter, mm 215.9
Bit diameter, inch 8 ½
Bit designation, IADC 832Z
Connection thread, API 4 ½" REG
Bearing type Air-cooled, on rolling bearings
Formation type For extra hard abrasive formations
Rotation speed. RPM 115-60
Max. applicable load, kN 90-200
Weight, kg 33.8
Bearing/cooling type Roller – Ball – Roller / Air cooling
Blow-through type Side / center
Cutting structure Tungsten carbide inserts

technical specifications