API Spec 7K Roller Kelly Bushing

API Spec 7K Roller Kelly BushingRoller Kelly bushing is a necessary tool for drilling, by matching with rotary square to drive Kelly pipe. Through the rotation of four rolls, the friction between roll

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API Spec 7K Roller Kelly Bushing


Roller Kelly bushing is a necessary tool for drilling, by matching with rotary square to drive Kelly pipe. Through the rotation of four rolls, the friction between rolls and Kelly pipes is reduced to extend service life. Change different rollers to match with different squares and hexagonal Kelly pipes and connect with different rotary tables. Two transmission styles (square and pin drive) are available. The product is designed and manufactured according to API Spec 7K. 


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The roller Kelly bushings have two way of drive, the square drive and the pin drive. There are heavy, medium and light-duty according to type. The main technique specification as follows:

 

Model

HDS

27-HDP

20-HDP

MDS

20-MDP

17-MDP

LDS

Type

Heavy

Medium

Light

Max.torque

N.m

32365

22555

13729

ft.lbf

23871

16636

10126

Drive Mode

Square

Pin

Square

Pin

Square

Square

mm

76.2152.4

63.5133.35

63.5133.35

in

36

2 1/2~5 1/4

2 1/2~5 1/4

Hex

mm

76.2152.4

76.2107.95

76.2107.95

in

36

3~4 1/4

3~4 1/4

Weight

Kg

700

730

670

420

460

340

400

lb

1540

1610

1470

924

1012

750

808