Drilling Bit1
The optimal localization and the selected high quality steel of teeth help the bit to achieving the greatest in drilling;
The optimal design which has special sealing structure with the best compression draught effectively increases the sealing properties of bearings;
The improved structure of heel row teeth and the hardened shirttail made the bit possess better gage protection;
The advanced pressure compensators which can limit pressure difference and prevent pressure passages form blocking up with sands and mud, increase the reliability of bearing lubrications;
The pins of leg are treated with hard facing, and the internal surfaces of cones are treated with the special technique. And therefore improve the load-carrying ability and prolong the service life.
Technical Parameter of bit table(British)
IADC NO.
British(in)
Metric(mm)
Connection(in)
Suitable Formations
437
8 1/2
215.9
4 1/2
Soft formations with low compressive strength and high drill ability
9 1/2
241.3
6 5/8
12 1/4
311.1
6 5/8
13 3/6
349.3
6 5/8
447
7 1/2
190.5
4 1/2
Soft formations with low compressive strength and high drill ability
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
17 1/2
444.5
7 5/8
517
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
6 1/4
158.7
3 1/2
6 1/2
165.1
3 1/2
7 1/2
190.5
4 1/2
7 7/8
200.0
4 1/2
8 1/2
215.9
4 1/2
8 3/4
222.2
4 1/2
9 1/2
241.3
6 5/8
9 5/8
244.5
6 5/8
12 1/4
311.1
6 5/8
14 3/4
374.6
7 5/8
17 1/2
444.5
7 5/8
527
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
7 1/2
190.5
4 1/2
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
12 1/4
311.1
6 5/8
16
406.4
7 3/8
537
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
7 1/2
190.5
4 1/2
7 7/8
200.0
4 1/2
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
12 1/4
311.1
6 5/8
16
406.4
7 3/8
17 1/2
444.5
7 5/8
547
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
7 1/2
190.5
4 1/2
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
9 5/8
244.5
6 5/8
12 1/4
311.1
6 5/8
16
406.4
7 3/8
17 1/2
444.5
7 5/8
617
8 1/2
215.9
4 1/2
Medium to medium hard formations with high compressive strength
9 1/2
241.3
6 5/8
9 5/8
244.5
6 5/8
12 1/4
311.1
6 5/8
637
6
152.4
3 1/2
Medium to medium hard formations with high compressive strength
7 7/8
200.0
4 1/2
8 1/2
215.9
4 1/2
12 1/4
311.1
6 5/8
737
7 7/8
200.0
4 1/2
Hard semi-abrasive and abrasive formations
8 1/2
215.9
4 1/2
837
8 1/2
215.9
4 1/2
Hard semi-abrasive and abrasive formations
IADC NO.
British(in)
Metric(mm)
Connection(in)
Suitable Formations
437
8 1/2
215.9
4 1/2
Soft formations with low compressive strength and high drill ability
9 1/2
241.3
6 5/8
12 1/4
311.1
6 5/8
13 3/6
349.3
6 5/8
447
7 1/2
190.5
4 1/2
Soft formations with low compressive strength and high drill ability
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
17 1/2
444.5
7 5/8
517
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
6 1/4
158.7
3 1/2
6 1/2
165.1
3 1/2
7 1/2
190.5
4 1/2
7 7/8
200.0
4 1/2
8 1/2
215.9
4 1/2
8 3/4
222.2
4 1/2
9 1/2
241.3
6 5/8
9 5/8
244.5
6 5/8
12 1/4
311.1
6 5/8
14 3/4
374.6
7 5/8
17 1/2
444.5
7 5/8
527
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
7 1/2
190.5
4 1/2
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
12 1/4
311.1
6 5/8
16
406.4
7 3/8
537
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
7 1/2
190.5
4 1/2
7 7/8
200.0
4 1/2
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
12 1/4
311.1
6 5/8
16
406.4
7 3/8
17 1/2
444.5
7 5/8
547
5 7/8
149.2
3 1/2
Soft formations with low compressive strength and high drill ability
6
152.4
3 1/2
7 1/2
190.5
4 1/2
8 1/2
215.9
4 1/2
9 1/2
241.3
6 5/8
9 5/8
244.5
6 5/8
12 1/4
311.1
6 5/8
16
406.4
7 3/8
17 1/2
444.5
7 5/8
617
8 1/2
215.9
4 1/2
Medium to medium hard formations with high compressive strength
9 1/2
241.3
6 5/8
9 5/8
244.5
6 5/8
12 1/4
311.1
6 5/8
637
6
152.4
3 1/2
Medium to medium hard formations with high compressive strength
7 7/8
200.0
4 1/2
8 1/2
215.9
4 1/2
12 1/4
311.1
6 5/8
737
7 7/8
200.0
4 1/2
Hard semi-abrasive and abrasive formations
8 1/2
215.9
4 1/2
837
8 1/2
215.9
4 1/2
Hard semi-abrasive and abrasive formations
FORTUNE PACIFIC MACHINE TOOL LIMITED
E-mail: FortunePacificFrankWong@Gmail.com; fortunepacific@yahoo.cn; 
MSN: fortunepacific@hotmail.com 
Skype: Mr.frank.wang 
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No.78 Great Wall Road, 271000 Taian City,Shandong Province,China