Canadian Mining Journal


DRILLING: Cat introduces down-the-hole hammer and bits for blastholes

PEORIA, Ill. – Caterpillar now offers Cat down-the-hole (DTH) hammers and bits designed for the most severe blasthole drilling applications. And they are cost effective for a wide range of drilling needs.

The new Cat DTH hammer is 150 mm in diameter and is the first to be introduced in the new DTH line. Its valved design provides reliable operation, low air consumption, easier maintenance and cost effective rebuild. The piston design delivers long life and efficient energy transfer.

The new hammer is rated to run with compressed air systems driving working pressures up to 34.5 bar. This additional back head pressure, when combined with corresponding airflow demanded, generates more blows-per-minute to generate faster penetration rates in the hardest of materials.

Caterpillar also is introducing bits for DTH drilling. Several different configurations of 170 mm bits are now available in both standard and heavy duty versions to allow matching the bit to the rock characteristics and job requirements. The bit selections include a variety of carbide shapes (spherical, ballistic) and face shapes (concave, flat, convex). Cat bits are optimized for high wear resistance and improved rock chipping. The aggressive, long lasting cutting structure in conjunction with the efficient Cat DTH hammer delivers a superior rate of penetration.

Caterpillar’s advanced materials and heat treatment technology used in the DTH products yield longer life and result in lower overall drilling costs in demanding conditions. In head-to-head tests conducted in iron ore and quarry applications, Cat DTH hammers and bits demonstrated significantly lower total cost of drilling.

See the local Cat dealer for more information about Cat DTH hammers and bits or visit