This is Atlas Copco part number 0663613600 O-Ring, stocked at Crowder Supply as AC-0663613600. Its job is to hold the pressure boundary between two mating faces; a hardened or nicked seal shows up as lost power and a damp housing well before anything else fails.
It is called out in the parts diagram for the BBD 46 WS/WR Rock Drill. Compare it to the reference callout on the diagram to be sure it is the position you need.
Use the parts diagram hub to work through the rest of the assembly, or the Atlas Copco lineup if you are pricing a replacement machine. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: 0663613600
- Manufacturer: Atlas Copco
- Crowder SKU: AC-0663613600
- Listed on breakdowns for: BBD 46 WS/WR Rock Drill

