Ordering by number: this is 4700W51170, the Chicago Pneumatic washer. It spreads clamp load and protects the face under the fastener routine hardware, but the wrong one changes how the joint holds torque.
If you are working from a machine rather than a part number, start at the full diagram library, or send us the model and serial and we will match it. Machines themselves are on the Chicago Pneumatic lineup. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 4700W51170
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-4700W51170