Application: Used for high compressive strength, medium hard and high abrasive formation, such as limestone, sandstone, dolomite, flint, etc.
Compressive strength: 100-150 Mpa
Lug protection (G feature): Hard-metal and wear resistant carbide were applied to shirttail and shirttail lip. The shirttail features a “ terraced design”, which increases escape area and the bailing velocity and decrease cuttings regrind and wear on the bit.
Bearing structure (SGA):
- Bearing type: Roller-Ball-Roller- Thrust Button/ Flat compound sealed
- Improvement item : The cone adding the seal groove, the bearing uses the flat seal ring
- Advantages: The cone seal groove can limit the sealing ring moving in the bearing internal, improve the stability of the sealing. The flat sealing ring has longer sealing life and better sealing effect; than the traditional sealing ring