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Roller Kelly Bushing

General

Roller Kelly Bushings are designed and manufactured as per API Spec 7K "Drilling and Well Servicing Equipment" for driving Kelly in the drilling operation.
Roller kelly bushings are constructed in upper body half, low body half, rollers, rollers pin and etc., can be available in square drive or pin drive. Square drive roller kelly bushing designed with taper contact surface in low body half, while pin drive roller kelly bushing designed with pin to be installed in low body half.
According to torque of drilling, roller kelly bushing can be available in heavy duty, medium duty and light duty, heavy duty bushings are for high torque and high speed drilling operations while medium duty and light duty are for medium or shadow depth drilling operations.
Roller kelly bushings can accommodate square Kelly or hex Kelly, for square Kelly, the bushing is designed with four flat rollers, and for hex Kelly, the bushing is designed with two V-shaped rollers and two flat rollers. By changing roller size, roller kelly bushing can accommodate square Kelly from 2
½" to 5¼" or hex Kelly from 3" to 6", and can be installed in rotary table range from 17½" to 37½".

Specification of Roller Kelly Bushing

Model

HDS

27-HDP

20-HDP

MDS

27-MDP

17-MDP

LDS

For square kelly

3"~6"

3"~6"

3"~6"

2½" to 5¼"

2½" to 5¼"

2½" to 5¼"

2½" to 5¼"

For hex kelly

3"~6"

3"~6"

3"~6"

3" to 4¼"

3" to 4¼"

3" to 4¼"

3" to 4¼"

Drive model

Square

Pin

Pin

Square

Pin

Pin

Square

Product photo of Roller Kelly Bushing

HDS

HDP

Roller Kelly Bushing

Roller Kelly Bushing

 

Exploded figure for HDS Roller Kelly Bushing

The square dimension of square drive roller kelly bushing is 342.9 (0~-0.40)×342.9(0~-0.40) and contact taper is 1:3(9°27′45″)

HDS

Description

Roller Kelly Bushing

 

S.N.

Description

Qty

1

Hold down nut

4

2

Lock washer

4

3

Hold down bolt

4

4

Upper body half

1

5

Lower body half

1

6

Thrust washer

8

7

O-ring seal

8

8

O-ring

8

9

Sheave bearing

4

10

Flat roller

2

11-a

V- roller

2

11

Screw pin

4

12

Grease fitting

4

13

Roller pin

4

14

Pin

8

 

Exploded figure for HDP Roller Kelly Bushing

HDP

HDS

Roller Kelly Bushing

S.N.

Description

Qty

1

Hold down nut

4

2

Lock washer

4

3

Hold down bolt

4

4

Upper body half

1

5

Retainer ring

4

6

Lower body half

1

7

Pin

4

8

O-ring seal

8

9

O-ring

8

10

Thrust washer

8

11

O-ring seal

8

12

O-ring

8

13

Sheave bearing

4

14

Roller

4

15

Screw pin

4

16

Grease fitting

4

17

Roller pin

4

18

Thrust washer

8

Contact dimension of pin drive roller Kelly bushing and pin drive master bushing: 

Nominal size for rotary table

L

D

in

mm

±1/16in

±1.588mm

±0.005in

±0.127mm

17½

444.5

19

482.6

2.472

62.79

20½

520.7

23

584.2

2.472

62.79

27½

696.5

25%

654.05

3.265

82.93

37½

952.5

25%

654.05

3.265

82.93

 

The information of our products listed in this website is provided in line with API Specifications and China's National Standards, description for any product can help readers make their own decisions.

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