This is American Pneumatic Tool part number 1280583457, previously 02107 lock washer – heavy duty, stocked at Crowder Supply as APT2107. It spreads clamp load and protects the face under the fastener routine hardware, but the wrong one changes how the joint holds torque.
It is called out in the parts diagram for the 138 Rock Drill and 155 Rock Drill.
Everything else on that machine is one page away on the parts diagram library; complete tools are on the American Pneumatic catalog. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 1280583457
- Previous part number: 02107
- Manufacturer: American Pneumatic Tool
- Crowder SKU: APT2107
- Listed on breakdowns for: 138 Rock Drill, 155 Rock Drill
