Treat the DTH package as one system

A DTH bit is not selected independently from the hammer and compressor. The nominal hole diameter, hammer series, shank interface, operating pressure, required air flow, formation and drill string must work together. Start by identifying the existing hammer model or the hole requirement if the complete system is new.

Confirm the mechanical interface

• Hammer model and nominal size
• Required shank type and bit diameter
• Top connection and drill-string thread
• Available casing or overburden system
• Rig rotary head and handling limits

Shank names that look similar are not automatically interchangeable. Send the hammer data plate, existing bit photos and drawings when possible.

Check the available air package

Record compressor rated pressure and flow, operating altitude, hose and pipe arrangement, and whether other equipment shares the air supply. The final operating requirement must follow the confirmed hammer information. Allow for site conditions and system losses rather than comparing only catalogue headline values.

Describe the rock and hole

State hardness, fracture, abrasiveness, water inflow, finished diameter, depth and inclination. These inputs influence bit face, button arrangement, flushing and the expected operating response.

Before requesting a quotation

Send the hammer model, shank, bit diameter, compressor, rock, hole, thread, quantity and delivery destination. If one input is unknown, say so clearly; technical sales can identify the next measurement or photo required.