DeWalt N517447 Spare Part - PISTON

N517447

Original DeWalt piston — part number N517447 — a genuine replacement piston for DeWalt SDS-style rotary hammers. This precisely machined piston is the internal hammering element used in the SDS hammer mechanism and is supplied as the single piston spare (it’s also included in DeWalt piston kit N505552 when you want the con rod, O‑ring and pin together).

Fits a range of DeWalt rotary-hammer models, for example DCH283, DCH293, DCH323, DCH333, DCH334 and the D25333K/D25334K Type 2 variants — check your tool’s model/type stamping to confirm compatibility before ordering.

If you’re replacing a damaged or worn piston, this genuine DeWalt part restores the correct fit and impact action inside the hammer gearbox; when replacing, inspect the mating con rod (N390874), O‑ring (N394408) and piston pin (N123257) and replace them if they show wear — those items are the parts included in kit N505552.

Sold as the original DeWalt piston (N517447); perfect when you need the exact part to get a DeWalt rotary hammer back to proper hammering performance.