Characteristic of bearing structure:

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.

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


Note: Tricone Bit sizes and types that are not shown in above table list will be customized according to specific drilling requirements.


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