4 5/8" TCI tricone bit is widely used in water well drilling, exploration, HDD pilot hole, foundation piling, it has a central jet hole design, so it is also workable for reverse circulation drilling. The bearing is sealed, the working life is much longer than open bearing roller bits. This type of steel teeth tricone bit has a central hole which is suitable for RC drilling( Reverse Circulation drilling). IADC216 tricone bit could drill harder formations than IADC126, choosing the proper IADC according to hardness of rocks is the first step of high efficiency drilling. Far Eastern Drilling is an API certified factory of tricone roller bit.

Basical Specification
Size of Rock Bit	4 5/8"
	118mm
Bit Type	Steel Tooth Tricone Bit/ Milled tooth Tricone Bit
Thread Connection	2 7/8 API REG PIN
IADC Code	IADC 216
Bearing Type	Journal Sealed Roller Bearing
Bearing Seal	Rubber Seal
Heel Protection	Unvailable
Shirttail Protection	Available
Circulation Type	Mud Circulation
Drilling Condition	Rotary drilling,high temp drilling,deep drilling,motor drilling
Nozzles	Central Jet Hole
Operating Parameters
WOB (Weight On Bit)	7,954-22,537 lbs
	35-100KN
RPM(r/min)	60~180
Formation	Soft to medium formations with high compressive strength, such as mudstone,gypsum,salt,soft limestone ,etc.