PB890 Raise Boring Pilot Bit

Raise boring pilot bit

Minerza PB890 Series

Max cutter load: 27 ton

Max cutter RPM: 85

Diameter: 229–406 mm (9–16 in)

Bit weight: 45–212 kg

Max bit load: 29,665–52,160 kg

Description:

The Minerza PB890 Series pilot bits are designed for high-performance raise boring with outstanding precision and durability. Featuring a reinforced dual-seal bearing system, SH75 carbide inserts, and full leg protection, these bits deliver extended service life and consistent performance under heavy loads and high temperatures. The optimized cutting geometry ensures smooth rock fragmentation across soft to very hard formations, reducing wear and vibration. Built for reliability, PB890 minimizes downtime, increases drilling meters per bit, and enhances overall operational efficiency.