The Kelly bar is attached onto the drilling rig, which transfer torque and downward force from the rotary drive to the piling or drilling tools. Kelly bar has a telescopic structure which include the swivel joint, lifting eye plate, crown of Kelly bar, telescopic tubes, spring, and Kelly bar end etc .
The Kelly bar has to fit the rotary drive dimension, otherwise, the Kelly bar cannot be inserted into the rotary drive and work properly.
1. Friction and interlocking type.
2. Kelly bar for Bauer rig, Soilmec machine and all other Kelly bar drilling machines.