When it comes to high-efficiency drilling across various formations, selecting the right tri-cone bit is critical. The S Series Elastomer Sealed Roller Bearing Tri-Cone Bit stands out as a top-performing solution, engineered with advanced materials and optimized for both durability and high-speed rotation under low to medium Weight on Bit (WOB) conditions.
Advanced Cutting Structure
Whether you’re using a steel tooth bit or an insert bit, the S Series offers cutting-edge enhancements:
- Steel Tooth Bits: Equipped with high-density premium tungsten carbide hardfacing, these bits offer exceptional wear resistance, significantly extending bit life even in abrasive formations.
- Insert Bits: Incorporate newly formulated tungsten carbide inserts using advanced techniques to improve compressive strength, resisting breakage and chipping under high-load conditions.
Superior Gauge Protection
Maintaining gauge is key to drilling precision and bit longevity. The S Series integrates:
- Gauge trimmers on the heel
- Tungsten carbide gauge inserts
- Hardfacing on the shirttail
These components work together to ensure maximum gauge-holding performance and improve seal protection, especially during longer drilling intervals.
Precision Roller Bearing Design
The bearing system in the S Series is built for stability and endurance:
- High precision roller bearing with dual thrust faces
- Friction-reducing alloy hardfacing
- Ball locking mechanism for cone stability
These features enhance abrasion and seizure resistance, improving reliability in deep or extended drilling operations.

Advanced Sealing and Lubrication
To withstand extreme conditions, the S Series uses a premium HNBR elastomer O-ring that offers superior:
- Seal compression
- Radial sealing performance
Combined with a pressure compensator system and advanced drilling grease, the bit maintains optimal lubrication, reducing friction and minimizing maintenance requirements.
Versatile Application Range
The S Series is engineered to perform in varied formations, including medium hard, abrasive, and interbedded rock layers. Thanks to its strong seal design and reinforced structure, it maintains high rotation speeds while preventing early bearing or insert failures, making it ideal for:
- Oil and gas exploration
- Geothermal drilling
- Water well and construction projects
Wide Range of Sizes and Models
The S Series covers a broad range of drilling needs, with sizes ranging from 5 7/8″ (149.2 mm) up to 36″ (914.4 mm), and model variants including:
- S124, S134, S214, S244
- ST115GW, ST125GW
- S515CG, ST545CG and more
This extensive lineup ensures there is an S Series bit for nearly every well condition and borehole size.
Why Choose the S Series?
- ✅ Long-lasting performance in challenging environments
- ✅ Reduced downtime due to improved seal and lubrication
- ✅ Consistent drilling speed and accuracy
- ✅ Comprehensive size and model availability
- ✅ Trusted by professionals across oil, gas, and geothermal sectors
If you’re looking for a robust and reliable tri-cone bit, the S Series Elastomer Sealed Roller Bearing Bit should be at the top of your list. For quick quotes and expert recommendations, contact BESDRILL today.