Ordering by number: this is 430126W80, the Tamco/Toku front head bushing. This part holds and guides the steel. Elongation of the shank bore is the usual reason for replacement, well before any crack appears.
It appears on the TJ 20 Rock Drill (RD 40) breakdown. It comes off the Tamco/Toku TJ-20 Rock Drill. Pull up the diagram and confirm the reference number for your serial before ordering.
Work through the rest of the assembly on the same breakdown, or start over from the parts diagram library. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 430126W80
- Manufacturer: Tamco/Toku
- Crowder SKU: TK-430126W80
- Listed on breakdowns for: TJ 20 Rock Drill (RD 40)

