RB440 Series Rotary Drill Bit

Rotary drill bit

Minerza RB440 Series

Bearing type: Sealed journal bearing

Cutting structure: QX2-type tungsten carbide inserts

Bit sizes: 200–311 mm (7.67–12.24 in)

Weight range: 35–98 kg

Description:

The Minerza RB440 Series rotary bits are engineered for high-performance surface drilling, combining robust sealed journal bearings with optimized QX2 cutting geometry for maximum efficiency and wear resistance. Designed for heavy-duty blast hole applications, they deliver up to 160% longer service life and significantly lower drilling cost per meter compared to conventional air bits. The advanced bearing system with dual-seal protection ensures superior reliability in harsh mining environments, while reinforced legs and hard-metal cone protection minimize wear and extend operational uptime.