DTH Drill Bit Face Designs Explained: Flat, Concave and Convex Bits for Different Drilling Conditions

The face of a DTH button bit is not designed only for appearance.

Its geometry affects how impact energy is transferred into the rock and how broken cuttings leave the bottom of the borehole.

Three common face concepts include flat, concave, and convex configurations.

Flat Face

Flat-face bits provide a simple and robust cutting surface.

They can be used in a wide range of drilling conditions depending on carbide layout and flushing design.

Potential advantages include:

• Strong face structure
• Stable impact distribution
• Good general-purpose performance

Concave Face

A concave center can help support borehole guidance in suitable formations.

It may provide:

• Stable drilling direction
• Effective center cutting
• Good flushing channels

Convex Face

Convex designs place more emphasis on the central or forward cutting area.

Depending on application, they may be selected for specific hard or abrasive conditions.

Button Layout Also Matters

Face profile is only one element.

Performance also depends on:

• Number of carbide buttons
• Gauge-button arrangement
• Front-button arrangement
• Button diameter
• Button shape
• Flushing holes

Rock Conditions Determine the Best Design

There is no universal face style for every project.

Before selecting a bit, consider:

• Rock hardness
• Formation abrasiveness
• Broken or solid formation
• Hole diameter
• Hammer model
• Compressor capacity

YKDRILL provides multiple DTH drill bit configurations for water well, mining, quarry, and construction drilling.

Providing detailed geological and equipment information allows a more suitable bit design to be recommended.