Highlights
Key Advantages
- Hardened alloy steel body stands up to daily hammering without mushrooming the splines — fewer change-outs underground.
- Straight spline profile matches the RD 18U chuck and shank adapter perfectly, so you get full torque transfer instead of slip and heat.
- OEM part, not a copy. Same dimensions, same heat treat, same fit. Bolts right up without shimming or grinding.
- If your rotation unit feels sluggish or the steel doesn't turn smoothly, swapping a worn drive sleeve often solves it before you chase bigger (and pricier) problems.