Tri-cone bit is the most widely used bits. It can adapt to various formations from soft to hard.
Tri-cone bits Specification
|
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
|
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