Genuine DeWalt part N108992 — a small, hardened metal washer that serves as a spacing/load-distribution washer on the ball‑spindle/rotary‑hammer assemblies to keep moving parts aligned and reduce localized wear during heavy vibration.

This washer is the direct-fit replacement used in a number of DeWalt rotary hammers and related models — for example DCH273, DCH363 and DCH253 — and is also listed for older DC2 rotary-hammer models such as DC210K and DC212K.

If your tool has a loose or missing spindle washer, installing the original DeWalt N108992 restores the correct clearance and preload so the gearbox and hammer mechanism run smoothly again; it’s an inexpensive, exact-match part that’s commonly needed when servicing parts for power tools.