Rock bits

HJ/HJT Series Rock bits
METAL SEALED Rock BIT WITH JOURNAL BEARING
HJ/HJT series Rock bit adopts metal seal with journal bearing, which can drill stably with high rotary speed.
The size range of HJ/HJT series bit is from 7 1/2 to 18 7/8 inch, and IADC varies from 117 to 547.For example:8 1/2HJT537G
# MAIN STRUCTURE FEATURES
Metal face seal journal bearing ,New processes of head bearing hardfacing and cone bearing silver plating are used to improve the load capacity ,anti-galling ability an dstability of the bearing .
various shapes of inserts can be equipped on this series of bits including scoop inserts, wedge inserts,conical-sherical inserts an double spherical inserts,etc.Drilling process & formation and bit are efficient integrated by scientific insert shape selection to realize safety and high efficient drilling.
For HJT Rock bits, a row of inserts is added between gage row and heel row to trim borehole wall and protect cone shell.