Drill Bits for Limestone and Natural Stone

Yes, limestone can be drilled using rotary drilling with PDC cutters or percussion-based DTH hammer bits fitted with tungsten carbide buttons. The right method depends on formation hardness, hole diameter, and application, such as water well, HDD, or geotechnical drilling, with tricone bits also suitable for softer limestone layers.

Diameters range broadly across product lines, from 2" to 18" for DTH hammer bits and 8" to 13.5" for PDC water well rock tools. Custom diameters outside standard ranges are also available upon request to match specific natural stone drilling project requirements and equipment compatibility.

PDC bits use polycrystalline diamond compact cutters for shearing action, ideal for consistent rock penetration and faster drilling in moderately hard limestone. DTH hammer bits use tungsten carbide buttons and percussion force, better suited for very hard, abrasive, or fractured limestone and natural stone formations.

Yes, custom manufacturing is available including non-standard diameters, face shapes (concave, convex, flat, double gauge), button shapes, and carbide grades such as Diamond or Bluemaxx. This allows bits to be tailored to specific limestone hardness, abrasiveness, and formation characteristics for optimal performance.

Connection types vary by bit and application, including API REG PIN connections (4-1/2" and 7-5/8") for PDC bits and various shank types like QL40, DHD340, and COP32 for DTH hammer bits. The correct connection ensures compatibility with your existing drilling rig and hammer system.

Tricone roller cone bits perform well across soft to hard limestone formations, offering versatile crushing and gouging action suited to variable rock conditions. They are commonly used in water well, oil and gas, and construction drilling where formation hardness may change throughout the borehole depth.