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Roller cone bit 244.5 822Z (9 ⅝" 822)

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 120 to 230 kN.
Rock strength range - from 55 000 to 66 000 PSI.
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Specifications
Bit diameter, mm:
244.5
Bit diameter, inch:
9 ⅝
Bit designation, IADC:
822Z
Connection thread, API:
4 ½" FH
Bearing type:
Air-cooled, on rolling bearings
Formation type:
For extra hard abrasive formations
Rotation speed. RPM:
115-60
Max. applicable load, kN:
120-230
Weight, kg:
42.8
Bearing/cooling type:
Roller – Ball – Roller / Air cooling
Blow-through type:
Side / center
Cutting structure:
Tungsten carbide inserts
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