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How to Choose DTH Drill Bits for Granite, Basalt, Limestone and Other Rock Formations

Rock hardness and abrasiveness have a major influence on DTH drill bit performance. Choosing the correct carbide button shape, face design, flushing structure, and bit diameter can improve penetration and reduce premature wear in different geological formations.
Sep 25th,2026 31 Views

No single DTH drill bit performs equally well in every geological formation.

The correct bit should be selected according to rock hardness, abrasiveness, fracture conditions, and drilling objectives.

Granite

Granite is generally hard and can be abrasive.

Important requirements include:

  • Strong carbide buttons
  • Good gauge protection
  • Efficient flushing
  • Stable hammer energy

Wear resistance is usually a major priority.

Basalt

Basalt is dense and can generate high impact loads.

The bit should provide:

  • Strong carbide retention
  • Durable steel body
  • Stable face structure
  • Reliable cuttings removal

Limestone

Limestone conditions can vary from relatively soft to hard and fractured.

The most suitable bit configuration depends on:

  • Rock strength
  • Fracturing
  • Abrasiveness
  • Required penetration speed

Quartz-Rich Formations

Quartz-rich formations can cause rapid abrasive wear.

Contractors should closely monitor:

  • Gauge wear
  • Carbide condition
  • Bit-body erosion
  • Hole diameter

Fractured Rock

In broken formations, stability and flushing become especially important.

Poor cuttings removal can increase the risk of:

  • Bit sticking
  • Re-drilling cuttings
  • Abnormal wear

Other Selection Factors

Rock formation is only one part of bit selection.

Also consider:

  • DTH hammer size
  • Air pressure
  • Airflow
  • Hole diameter
  • Drilling depth
  • Rig torque

YKDRILL supplies DTH drill bits for a wide range of water well, mining, quarrying, and hard-rock drilling conditions.

For better product matching, customers can provide rock information, hammer model, current bit photos, required hole diameter, and compressor parameters.

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