This is the Tamco/Toku front head – 7/8 X 4 1/4″ part number 430127W70, Crowder SKU TK-430127W70. It is the business end of the rock drill it locates the tool steel and absorbs the impact reaction, so bore wear here shows up as a loose, rattling shank.
You will find it on the diagram for the TJ 20 Rock Drill (RD 40). That machine is the Tamco/Toku TJ-20 Rock Drill if you are pricing a replacement rather than a repair. 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 breakdown index. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: 430127W70
- Manufacturer: Tamco/Toku
- Crowder SKU: TK-430127W70
- Listed on breakdowns for: TJ 20 Rock Drill (RD 40)

