Ordering by number: this is 3310101810, the Atlas Copco retainer – complete 1″. This part keeps the steel captive in the tool under repeated impact, so it is inspected at every steel change and replaced on condition rather than on a schedule.

Give us the model and serial off your machine and we will confirm the fit; the full diagram library and the Atlas Copco tool range are the other two places to start. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.

• Part number: 3310101810
• Manufacturer: Atlas Copco
• Crowder SKU: AC-3310101810