1、 Application：Roller Kelly bushing is a dedicated device designed for transmission of torque to driving kelly in the drilling operation .It can be classified as two types based on different ways of drive, square drive and pin drive, also they can classified as three types based on different styles, heavy, medium and light-duty. They can be applicable for rotary table size from 17½ to 37½. By changing roller size ,they can accommodate square kellys from 2½ to 5½ or hex kellys from 3 to 6.
2、Product execute standards： API-7K
4、Partial specifications data are provided as follows：
According to customer requirements, We can design and manufacture other special type of products Tonghua City Qianjin Petro-Mechanical Co.Ltd