●Sealed journal bearing

Journal bearing structure with head bearing hardfaced and cone bearing silver plated to improve load capacity and anti-galling ability of the bearing. More wear and high-temperature resistant highly saturated sealed journal bearing is used to improve reliability. Larger Sealed journal bearing reduces pressure on the seal, and the boss at outer end of the seal is also helpful for reliability of the seal. Surface of the thrust bearing couple are specially treated for decreasing friction and increasing rigidness, load capacity of the bit and anti-galling ability of the bearing are consequently improved.

●Cutting structure

Hardfaced gage and tooth surfaces.

●Hardfacing on shirttail

This feature can provide better protection for seal and bearing to extend the bit’s service life.

●Recommended operating parameters:

Bit Pressure: 0.4 ~ 0.65 KN

Rotary Speed: 60 ~ 200 r/min

Pumping Pressure: 10 ~ 20 Mpa

Sediment Concentration: < 0.5%

●The above parameters are only for reference. Optimized parameters are determined by drilling process

and lithology of formations on site.

●Applicable formations:Hard-High compressive strength with sharp layers of sand or siltstone.Tricone bits will be used in rock drilling.