Product Description
This R32 jumbo-drilling family covers 45, 48, and 51 mm button bits for development rounds, roof-bolt holes, and probe drilling with compatible hydraulic equipment. The three gauges allow the drilling plan to balance hole size against available impact energy without changing the named thread system. Use the mining and exploration application archive to define the job and the hard formation archive to assess competent rock. These bits are not designed to advance casing through collapsing ground.
The construction is a threaded alloy-steel body with fixed carbide buttons and an R32 interface. The source confirms diameter-thread pairings of 45-R32, 48-R32, and 51-R32, but it does not identify the face as flat, drop-center, or retrac. Button count, skirt length, thread shoulder, and flushing geometry are likewise absent. Those omissions matter on a jumbo because rod handling and high impact frequency expose a poor thread or skirt match quickly. Verify the exact bit drawing and drill-string condition for each gauge before deployment.
Operate at 1,000–3,000 lbf/in of diameter and 25–60 RPM, starting low enough to establish stable collaring and balanced contact. Hard and abrasive intervals require attention to gauge buttons, thread wear, and recutting, while medium rock may need less mechanical load. No fixed flow appears in the source data, so flushing must be set from hole depth, rod bore, and return behavior. Track rod heating during each shift. The limitation is the undocumented face style, not the R32 label. Rock response concepts are summarized by the ScienceDirect rock-mechanics reference.