This is the Atlas Copco washer part number 3121072400, Crowder SKU AC-3121072400. It spreads clamp load and protects the face under the fastener routine hardware, but the wrong one changes how the joint holds torque.
Crowder’s breakdowns list this part on the BBC 34DSI Rock Drill and BBC 16W WS Pusher Leg Drill, and on 3 other machines. Check it against the reference number on the diagram first; serial breaks change what fits.
If you need the parts around it, the full diagram library has the full breakdown library, and the Atlas Copco catalog covers the machines themselves. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 3121072400
- Manufacturer: Atlas Copco
- Crowder SKU: AC-3121072400
- Listed on breakdowns for: BBC 34DSI Rock Drill, BBC 16W WS Pusher Leg Drill, BBC 34W WS Pusher Leg Drill, ALF 72D 72D-1 Pusher Leg, ALF 67/80 67/80D Pusher Leg
