- Application: Used for soft formation with low compressive strength and high drill-ability, such as shale, soft limestone, soft sandstone, gravel clay, soft dolomite, salt rock and coal seam, etc.
Compressive strength: 50-90 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: RollerBall- RollerThrust Button/O ring seal
- Shirttail lip protection (W): Radial surface of shirttail lip is processed by milling groove, and wear-resisting alloy is applied inside to strengthen shirttail lip protection and increase the bearing.