Chuck – 7/8 X 3-1/4″ Hex is the American Pneumatic Tool service part carried under part number 159. It holds the working steel in the rock drill. Retention hardware is a wear and safety item a stretched or cracked retainer lets the steel move, which chews the front head.
It shows up in the parts breakdown for the 138 Rock Drill. Check it against the reference number on the diagram first; serial breaks change what fits.
Use the parts diagram library to work through the rest of the assembly, or the American Pneumatic Tool range if you are pricing a replacement machine. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 159
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT159
- Listed on breakdowns for: 138 Rock Drill
