Square drive bushing
Square drive bushing is also referred to as roller bushing or roller kelly bushing. This roller bushing is an essential drilling tool. Square drive bushing is used for 17 1/2-49 1/2 inch rotary tables. It's designed and manufactured according to API Spec 7K. The roller kelly bushing works with master bushing to drive drill pipe.
Advantages:
- Pulling out or feeding off string can be done while rotating.
- Designed with the integral construction, the roller bushing can not fly out or hurt you.
- This roller kelly bushing is easily installed into the master bushing, maintaining good alignment.
- The kelly has lower wear and long life.
- Labor condition is improved, and penetration rate is faster.
Specifications of Roller Bushing:
| Type | Way of drive | Model | Suitable for kelly | |
| Square | Hex | |||
| Heavy | Square drive | HDS | 21/2-6 | 3-6 |
| Medium | Square drive | MDS | 21/2-41/4 | 3-41/4 |
| M4 | 21/2-51/4 | 3-41/4 | ||
| Light-duty | Square drive | S4 | 21/2-41/4 | 3-41/4 |
Jiangsu Kayson Petrol- Machinery Co. Ltd is a professional China roller kelly bushing manufacturer. After several years of research and innovation, the company has become a roller bushing and other oil drilling tools supplier with a certain scale. The products include: bushings, bottleneck elevator, manual tongs, spiders, slips, inserts and bit breakers.