This is American Pneumatic Tool part number 1280583779, which replaced the older number 02399 retainer plunger, stocked at Crowder Supply as APT2399. This part keeps the steel captive in the rock drill under repeated impact, so it is inspected at every steel change and replaced on condition rather than on a schedule.
It appears on the 137 Rock Drill breakdown. That machine is the APT 137 Pneumatic Rock Drill if you are pricing a replacement rather than a repair.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the parts diagram library. Denver stock, with same-day shipment on in-stock orders in by 4 PM ET.
- Part number: 1280583779
- Previous part number: 02399
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT2399
- Listed on breakdowns for: 137 Rock Drill
