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Single Cone Roller Bit for Very Hard Rock Drilling
Single Cone Roller Bit for Very Hard Rock Drilling
Single Cone Roller Bit for Very Hard Rock Drilling
Single Cone Roller Bit for Very Hard Rock Drilling
Single Cone Roller Bit for Very Hard Rock Drilling

Single Cone Roller Bit for Very Hard Rock Drilling

Different name:tri-cone bit, Roller Cone, 8.5" Roller Bit
Main application:core barrel,
Core specification parameters:8.5”, 8 1/2, IADC 637
Applications:Granit drilling, Drilling bucket, Core barrel, Deep foundation drilling, bored piling, Drilled shafts, water well drilling, HDD tools, Civil engineering, Infrastructure etc.
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The wear parts we produced for foundation drilling include round shank chisel, flat teeth, welding bar, roller bit, pilot, casing screw and so on. 

The roller bit is made of tungsten carbide and steel. The tungsten carbide tip is wear-resistant which performs well in very hard rock drilling. Our drill bits are with high efficiency for drilling and long service life. 

Material: Tungsten Carbide, Steel 



KDR-478.5” Roller bit with 47pcs conical bitFor 110-180Mpa
KDR-508.5” Roller bit with 50pcs conical bitsFor 110-180Mpa
KDR-528.5” Roller bit with 52pcs conical bitsFor 110-180Mpa
KDR-50H8.5” Roller bit with 50pcs conical bits and holderFor 110-180Mpa
KDR-12 1/412 1/4” Roller bitFor 110-180Mpa


Wooden Case.

Place of Origin:Made in China
Model:8 1/2” single cone, 12 1/4” roller bit
Material:Carbide tip, Steel
Usage:Hard Rock Drilling, Granit drilling, core barrel
Certification:ISO 9001/ COC/PVOC
Minimum Order Quantity:1 pc
Packaging Details:Case
Delivery Time:At Stock or 7 working days for large quantity
Competitive Advantage
  • Special design for Piling tools

  • 1.6KG-2.1KGS carbine bits for each roller bit

  • Reasonable layout of carbine bit

  • High torque & drilling weight capacity (6.5 tons)

  • Reach to 2500mm core barrel application

  • High temperature sealing ring

  • Vacuum oil filling


WS 39 teeth

WS 39 teeth

flat teeth

round shank chisel


drill bits packing


1. What are drill bits for drilling buckets and augers?

Drill bits for drilling buckets and augers are robust tools attached to the bottom of these devices, designed to facilitate effective drilling through various ground conditions.

2. What materials are these drill bits made of?

They are typically made from high-grade, wear-resistant steel alloys to withstand the stresses of drilling through different types of soil and rock.

3. Are there different types of drill bits for different ground conditions?

Yes, there are various types of drill bits designed specifically for different ground conditions, ranging from softer soils to harder rock or mixed terrains.

4. How do drill bits work?

Drill bits have cutting teeth or edges that break down the material being drilled. They rotate with the drilling bucket or auger, penetrating and excavating the ground.

5. Are these drill bits universal for all drilling buckets and augers?

No, drill bits must be compatible with the specific type of drilling bucket or auger being used to ensure optimal performance and safety.

6. How often do these drill bits need to be replaced?

The frequency of replacement depends on the level of wear and tear, which is influenced by the type of ground conditions and the intensity of use. Regular maintenance checks are essential.

7. Can drill bits be customised for specific projects?

Yes, for unique ground conditions or specific project requirements, custom-designed drill bits can be manufactured to ensure the best performance.

8. What is the significance of the shape and arrangement of cutting teeth on drill bits?

The shape and arrangement of cutting teeth are crucial for maximizing efficiency and penetration in the intended substrate, with different designs suited to different drilling needs.

9. Are these drill bits suitable for both construction and geotechnical applications?

Yes, these drill bits are versatile and can be used in a range of applications, including building foundations, bridge construction, and soil sampling in geotechnical surveys.

10. What should be considered when selecting a drill bit for a drilling project?

Factors to consider include the type of ground condition, the depth and diameter of drilling required, compatibility with the drilling equipment, and the specific requirements of the project.