SHANDONG SAIGAO GROUP CORPORATION
Square Kelly

Square Kelly

Kelly is the drive part of whole drill stem, it has two types, square kelly and hexagonal kelly and all of them are manufactured comfort to API Spec7-1 and SY/T6509-2000 criterion.

Our Square& Hexagonal kelly are made from AISI 4145H modified alloy bars that are quenched and tempered full length. After such heat treatment, its brinell hardness can reach 285-341. Kelley's end, drive cross-section and joint are all processed and tested according to API standard.


Application of Square kelly:

The kelly is located at the uppermost end of the drill string and has two squares and six squares. In the rotary drilling, when drilling, the kelly cooperates with the square filling and the rotating shaft to transmit the torque of the ground turntable to the drill pipe to drive the drill bit to rotate; and to withstand the weight of the drill string.

In the drilling of turbines and screws, the weight of the drill string and the counter torque are withstood.

Technical Specification of Square kelly:

Norminal Size

(in)

Length(ft)

Top Upset Joint

Bottom Upset Joint

Bore D

Drive Section

API BOX

Thread Left Hand

Du

Right Hand Connections

DL

Across

Corners

Across

Flates

3-1/2

40

6 5/8REG

7 3/4

NC38(3 1/2IF)

4 3/4

2 1/4

4.437

3 1/2

4-1/4

40

6 5/8REG

7 3/4

NC46 (41F)

NC50(4 1/2IF)

6~6 3/8

6 1/8~6 3/8

2 13/16

5.500

4 1/4

5-1/4

40

6 5/8REG

7 3/4

NC50

5 1/2FH

7

3 1/4

6.750

5 1/4

6

40

6 5/8REG

7 3/4

NC50

7 3/4

3 1/2

7.625

6



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Contact Us

sales@saigaogroup.com susan@saigaogroup.com
0531-69959201
qg18653457231
+86 18653457231
Zhongrun Century Center, No 12111,Jingshi Road, Lixia District, Jinan City, Shandong Province. P.R. China

Contact Us

sales@saigaogroup.com susan@saigaogroup.com
0531-69959201
Zhongrun Century Center, No 12111,Jingshi Road, Lixia District, Jinan City, Shandong Province. P.R. China