Retainer – 7/8 X 3-1/4″ Mach. is the American Pneumatic Tool service part carried under part number 1280582361 the number that superseded 18441. Retaining the tool steel is its whole job. Worn retention lets the shank hammer against the bore and turns a cheap part into an expensive front head.
You will find it on the diagram for the 155 Rock Drill. Compare it to the reference callout on the diagram to be sure it is the position you need.
If you need the parts around it, the parts diagram hub has the full breakdown library, and the American Pneumatic catalog covers the machines themselves. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 1280582361
- Previous part number: 18441
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT18441
- Listed on breakdowns for: 155 Rock Drill

