Kelly Bushing
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- HDP Roller Kelly Bushing
- HDS Roller Kelly Bushing
- M4 Roller Kelly Bushing
- S4 Roller Kelly Bushing
The kelly bushing is an indispensable device for petroleum drilling, and it is used to drive kelly with the help of a master bushing. It makes use of four rollers to reduce friction between itself and kelly so as to extend its service life, and the rollers can be changed to fit for square or hexagonal kelly.
Classification
1. According to drive method, our kelly bushing is divided into square drive kelly bushing and pin drive kelly bushing.
2. According to load capacity, our kelly bushing contains heavy duty kelly bushing, medium duty kelly bushing and light duty kelly bushing.
Application
The kelly drive bushing is designed and manufactured as per API Spec 7K, and it suits well for rotary tables ranging from 171/2 to 491/2inches.
| Type | Drive method | Model | Applicable kelly size (inch) | |
| Square | Hexagonal | |||
| Square drive | HDS | 21/2-6 | 3-6 | |
| Pin drive | 27-HDP | 3-6 | 3-6 | |
| 20-HDP | 3-6 | 3-6 | ||
| Square drive | MDS | 21/2-41/4 | 3-41/4 | |
| M4 | 21/2-51/4 | 3-41/4 | ||
| Pin drive | 20-MDP | 21/2-41/4 | 3-41/4 | |
| 17-MDP | 21/2-41/4 | 3-41/4 | ||
| Square drive | S4 | 21/2-41/4 | 3-41/4 | |
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