Down The Hole (DTH) Hammer

DTH Hammers

When you need reliable, high-performance drilling in the toughest rock, DTH hammers deliver. By placing the hammering mechanism at the bottom of the borehole, DTH systems send percussive energy straight to the bit for maximum penetration with minimal energy loss.

The result is faster cycle times, straighter holes, and consistent performance even at great depths. Generally, a DTH hammer can drill down to its nominal diameter, meaning a 4-inch hammer will produce a 4-inch hole.

The hammer’s outer diameter determines this limit because smaller hole sizes restrict airflow. For production drilling, the maximum recommended hole size is the hammer’s nominal size plus approximately 1 inch. For example, a 4-inch hammer can produce up to a 5-inch (127–130 mm) hole.

Selecting the correct hammer depends mainly on the required hole diameter and the rock type. Ideally, the hammer should closely match the desired hole size while providing enough clearance for efficient cuttings removal.