Robit’s Rbit and Haul Sub drilling systems: maintenance and cost notes for mine engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Robit is rolling out its Rbit drill bit series and Haul Sub adaptor system to cut unplanned maintenance and extend tool life in hard-rock production drilling. The Rbit design focuses on optimised button layout, improved flushing and wear-resistant carbide grades, while the Haul Sub allows damaged threads to be cut back and re-used instead of scrapping entire drill strings. Contractor Bohus Bergsprängning is among early adopters, signalling potential reductions in bit consumption, rig downtime and per‑metre drilling costs for Scandinavian quarries and underground mines.
Technical Brief
- Haul Sub adaptor is welded between the drill tube and shank adapter, creating a sacrificial threaded section.
- Once the sacrificial thread is worn, it is cut off and a new Haul Sub welded on.
- Contractor reports fewer complete rod changes, reducing manual handling exposure around the feed beam.
- Reduced scrapping of full drill tubes directly cuts steel consumption and transport requirements for replacement rods.
- Similar adaptor concepts could be retrofitted to other top‑hammer fleets where thread wear governs rod retirement.
Our Take
Robit’s work with Bohus Bergsprängning in Australia sits alongside its managed service contract for drilling consumables at the Endeavor silver-zinc-lead mine in New South Wales, signalling a push to lock in long-term tooling and maintenance roles rather than just spot sales.
Field trials at La Arena (gold-copper, Peru) and Kevitsa (nickel-copper, Finland) in our database show Robit deliberately proving its drilling tools in highly abrasive and geotechnically demanding conditions, which likely underpins the maintenance and productivity claims being promoted to Australian contractors.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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