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What are Down-the-Hole (DTH) Drill Bits and how are they used?

Pub Time: 2021-08-19 14:08:58

Applications for Overburden Systems

Soft soil is normally drilled with augers or by the rotary method but DTH Hammers have been adapted to handle soft conditions by being able to drill and case a hole simultaneously by using a concentric bit, which can be withdrawn on completion of the bore hole; leaving the casing in situ, thus preventing hole collapse.


As with all MSD hammers it is crucial that you choose the right drill bit otherwise it will cost you both in time and money. We pride ourselves on having a comprehensive range of drill bits on offer so you can be sure that you will definitely find a suitable bit for any project you are undertaking.

Our carburised drill bit are among the best in the world providing outstanding performance and durability.


We produce all our drill bits at our specialised plant where they are made out of high quality nickel chrome alloy steel, carburised and heat-treated to offer extra protection against wear and fatigue. Every hole in the bit head is machined to within microns and fitted with carbide inserts which provide the cutting action of the rock.


We have three different bit heads on offer, Flat Face, Concave and Convex, which are available with three different inserts.We guarantee that we have a drill bit that can tackle any challenge and rock face formation.The two most important factors in choosing the right drill bit are productivity and reliability.


For soft to medium rock formations where penetration rates are high, the ballistic and semi-ballistic inserts coupled with flat face or concave bit heads are more suitable.