Specifications

HJ/HJT Series Bit for Air Drilling Used In Hard Formation

1.Good quality &after-sale service 

2.Extensive industrail experience

3.ISO certified

4.Size:7 1/2" to 18 7/8"

Structural features

HJ/HJT series 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 1/2HJT 537G.

MAIN STRUCTURE FEATURES

1.Metal face seal journal bearing.New process of head bearing  hardfacing and cone bearing silver plating are used to improve the load capacity,anti-galling ability and stability of the bearing.

2.Various shapes of inserts can be equipped on this series of bits,including scoop inserts,wedge inserts,concial-spherical inserts and double spherical inserts,etc.Drilling process & formation and bit are efficient intergrated by scientific insert shape selection to realize safety and high efficient drilling.

3.For HJT,a row of inserts is added between gage row and heel row to trim borehole wall and protect cone shell.