Boart Longyear strengthens rods and bits range

According to Mining News Pro - It offers increased strength through stress reduction in two key ways.

Firstly, the tapered profile provides an increased material cross-section at the base of the threads, and secondly, the asymmetric thread geometry minimises stress concentrations. The lower stress combined with deep case hardening allows for a significant increase in cyclic load handling capability. More load cycles means more drilling time and more productivity.

Optimising the load distribution and contact area, the DriftMaster thread geometry is designed to maximise resistance to wear under the harshest drilling conditions. Combined with the wear resistance associated with carburising heat treatment, the DriftMaster endures the toughest drilling conditions.

To further improve productivity, the tapered thread profile offers superior rod-bit make-up and breakout characteristics for more drilling time.

DriftMaster is being introduced in 35 millimetre hex cross-sections for use with standard, Retrac, and Straightrac button bits from 43–64 millimetres. The initial offering includes dome and pilot reamers — including optional RazorBack, a patented high-productivity back-reaming bit.