This is the Chicago Pneumatic piston – 4″ part number P157921, Crowder SKU CP-P157921. It is the working heart of the chipping hammer. Pistons are matched to the cylinder bore, so replacing a worn one usually means checking the bore at the same time.
It is called out in the parts diagram for the CP 4121 Chipping Hammer. Pull up the diagram and confirm the reference number for your serial before ordering.
Use the parts diagram library to work through the rest of the assembly, or the CP tool catalog 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: P157921
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-P157921
- Listed on breakdowns for: CP 4121 Chipping Hammer
