HJ HJT Series Roller Cone Drilling Bits
HJ/ HJT metal sealed bit with journal bearing
HJ/HJT series bit adopts metal seal with journal bearing, which can drill stably with higher rotary speed.
The size range of HJ/HJT series bit is 7 1/2 – 18 7/8 inch and its IADC code is 437 – 547.
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 and stability of the bearing.
· Various shapes of inserts can be equipped on this series of bits, including scoop inserts, wedge inserts, conical-spherical inserts and double spherical inserts, etc. Drilling process & formation and bit are efficient integrated by scientific insert shape selection to realize safety and high efficient drilling
· A row of inserts is added between gage row and heel row of HJ bit to trim borehole wall and protect cone shell, and as a result, HJT series bit is formed.
Drilling Bits Type:
HJ437G、HJ447G、HJ517G、HJT537G.HJT417G、HJT437G、HJT447G、HJ517G.HJT517G.HJ527G、HJT527G、HJ537G、HJT537G、HJ547G、HJT547GY.HJ437G、HJ447G、HJT517G、HJ527G.HJ437G、HJ447G、HJ517G、HJT517G、HJ537G、HJT537G、HJ547G、HJT547G
HJ437G、HJT437G、HJ517G.HJT517GK、HJT537GK、HJT547GK.HJT517G.HJT517GK、HJT537GK、HJT547GK.HJT417G、HJ437G、HJT437G、HJ447G、HJT447G、HJ517G、HJT517G、HJ537G、HJT537G .HJT517GK、HJT537GK、HJT547G.HJT517GK、HJT537GK、HJT547G.HJ517G、HJT517G、HJ527G.HJT517G、HJT537G
