HA Series of Tricone Bits The bit bearing can be ball locked, bit with ball lock bearing can be adapts to high rotary speed drilling well. All adapts different distance row tooth, compact numbers and the exposure height, rows was optimized. insert offset crested scoop compacts in soft formation. Journal bearing. Hard faced head bearing surface. Cone bearing inlaid with friction reducing alloy and then silver-plated. The load capacity and seizure resistance of the bearing is effectively improved. O rubber sealing ring is made of the more wear resistance high saturated buna-N the compression capacity of sealing was optimized, large section diameter rubber sealing ring, special sealing groove shape increased the reliability of the rubber sealing ring.

 

Bit size	Inch (in)	5 7/8	6	61/8	6 1/4	7 7/8	8 3/8	8 1/2	8 3/4	9 1/2	9 5/8	9 3/4	9 7/8	12 1/4	13 3/4
	Metric (mm)	149.2	152.4	155.6	158.7	200.0	212.7	215.9	222.2	241.3	244.5	247.3	250.8	311.1	349.2
Bit type		437	437	437	437	447	417	417	417	417	417	417	417	417	417
		517	517	517	517	517	437	437	437	437	437	437	437	437	437
		537	537			537	517	517	517	517	517	517	517	517	517
		617	617			547	537	537	537	537	537	537	537	537
		637	637			617	617	617	617
							637	637	637
API Regular Pin (in)		3 1/2				4 1/2				6 5/8
Recommended make-up torque for bit shank (KN.m)		9.50-12.2				16.30-21.70				37.93-43.30