In mining, water well drilling, geotechnical projects, and oil & gas operations, the choice of drill bit directly affects drilling speed, durability, and cost efficiency. Among all bit types, TCI (Tungsten Carbide Insert) and Milled Tooth (MT) tricone bits are the most widely used. While they look similar, their structure and performance differ significantly.
Below is a clear and professional comparison to help you select the right bit for your project.
1. Structure & Materials
TCI Tricone Bit
Uses tungsten carbide inserts pressed into the cone. These inserts have extremely high hardness and wear resistance, making them ideal for long-term drilling in hard and abrasive formations. Different insert shapes (button, wedge, conical) provide optimized rock-breaking performance.
Milled Tooth Tricone Bit
The teeth are milled directly from the cone body. They are long, sharp, and deliver strong cutting action. Hardfacing is often applied to increase wear resistance, making MT bits highly efficient in soft formations.
2. Performance Characteristics
The strengths of TCI bits include:
- Exceptional wear resistance
- Longer service life
- Superior stability in hard, abrasive formations
The advantages of MT bits:
- Aggressive cutting action
- Higher penetration rates in soft formations
- More cost-effective for certain projects
3. Recommended Formation Types
TCI bits are ideal for:
- Hard formations such as granite, basalt, limestone
- Abrasive formations
- High WOB, high torque conditions
- Projects requiring longer bit life
Milled Tooth bits are best for:
- Soft to medium-soft formations: shale, claystone, sandstone
- Brittle formations
- High-RPM, low-weight drilling
- Budget-sensitive or fast-penetration jobs
4. How to Choose the Right Bit
The simple rule:
- For hard or abrasive formations → Choose TCI
- For soft to medium-soft formations → Choose Milled Tooth
We recommend selecting based on formation hardness, equipment parameters (RPM, torque, WOB), and expected drilling duration. Our technical team can also provide a customized bit recommendation based on your geological report.
As a professional tricone bit manufacturer, we offer:
✔ Full range of TCI & MT tricone bits
✔ Custom cone structures and insert options
✔ Solutions for mining, water wells, HDD, and oilfield drilling
✔ OEM/ODM services
✔ Formation evaluation & bit selection support
If you are looking for longer bit life, higher penetration rates, and better project economics, feel free to contact us.
