Ordering by number: this is R157932, the Chicago Pneumatic nut. It secures its joint against constant vibration, which is why it is treated as a replaceable item rather than a permanent one.

Matching it to a machine? Send us the model and serial and we will confirm the fit, or work back from the parts diagram hub. Complete tools are on the Chicago Pneumatic lineup. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.

• Part number: R157932
• Manufacturer: Chicago Pneumatic
• Crowder SKU: CP-R157932