Blue Demon BDA Drill Head


The BDA brings all the advantages of the Blue Demon BD to air drilling. It's a specially designed tool that substantially increases penetration rates and reduces costs in soft to medium rock formations.

When compared with ordinary drill heads with rotating bits, the BDA will cut up to twice the footage daily in soft shales, clays, shells, soft limestone, red beds and other rocks of low compressive strengths. In addition, it offers the following important features:


  • "Step" drilling pattern for fastest penetration.
  • BD-2 Bits.
  • Twin bits on outer surface for added protection.
  • No independent moving parts to become clogged.
  • Requires only a moderate weight for full effectiveness.
  • Precision machined head.
  • Durable, trouble-free.
  • 6 sizes for drilling holes from 4" to 1015/16".
  • Choice of 23/8", 27/8", 3" and 4" API shanks. Other threaded shanks on request.

Cutaway sketch of step drilling pattern as cut by Blue Demon BD and BDA Drill Heads. Lead bit drills 1" hole. It is followed by other bits that shear and ream final hole size. Bits are set at an angle to assure fastest penetration without scaping, chipping or gouging


Drilling blasthole with Blue Demon BDA Drill Head.


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