This is Chicago Pneumatic part number R085600, which also shows up as 3310103578 chuck – 7/8″ hex X 3 1/4″, stocked at Crowder Supply as CP-R085600. It holds the working steel in the rock drill. Retention hardware is a wear and safety item a stretched or cracked retainer lets the steel move, which chews the front head.
It is called out in the parts diagram for the CP 0014 RR RRBS Rock Drill. It comes off the CP 0014 Pneumatic Rock Drill.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram library. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: R085600
- Also listed as: 3310103578
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-R085600
- Listed on breakdowns for: CP 0014 RR RRBS Rock Drill

