Sealed Journal Roller Bits

The family of sealed journal bearing TCI & Mill tooth tricone drill bits from Throop Rock Bit has gained significant field experience over the last decade, making our bits a trusted choice amongst industry professionals worldwide. These bits are designed and manufactured for the toughest conditions utilizing field-proven technologies, quality materials and superior bearing design packages in order to provide reliable and consistent drilling performance.
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Slimhole product offering for reduced casing programs, re-entries, laterals, and coiled tubing operations. With a sealed journal bearing package and aggressive cutting structures in both steel teeth and Tungsten Carbide Insert bits, the COMPASS product provides reliable performance in all applications. COMPASS bits provide excellent steerability and high rates of penetration even when weight on bit is limited with bearing designs that can handle the increased RPMs in motor applications commonly found in this drill bit size range.


  • Vertical, directional, horizontal, and tangent well profiles.
  • Soft - medium formations for mill tooth (steel tooth) bits.
  • Soft - hard formations for TCI bits.
  • For all rotary, motor, and RSS applications
  • Hydraulic design: Full hole Regular or Jet Circulation


● Equipped with a silver plated journal bearing bushing and thrust washer for increased durability and reliability

● Utilize synthetic lubrication grease optimized for high RPMs

● Include a grease compensation system superior deep hole performance

● Compact spacing of moderate conical inserts provide increased durability for the toughest formations