DeWalt SPRING - N078434

Original DeWalt compression spring — part N078434 — a small metal compression spring that sits over the anvil shaft and provides the tension that holds the anvil/sleeve and bit-retaining components together.

Fits many DeWalt impact drivers including : DeWalt DC827 Type 1 / DC835 Type 1 / DC837 Type 1 / DC845 Type 1 / DCF886 Type 1 / DCF836 Type 1 / DCF815 Type 1 / IMPACT DRIVER - DCF886 Type 2.

This part works with the 3.5 mm anvil ball (part N089668) and sits under the plain washer/hog‑ring assembly so replacing it restores the spring tension that returns the chuck collar and keeps bits from falling out.

If your impact driver won’t hold bits or the chuck collar doesn’t return, this genuine DeWalt N078434 compression spring is the exact replacement to get the nose assembly operating correctly — a straightforward swap that’s commonly used in repairs. Order this genuine DeWalt when you need reliable power tool parts to bring your tool back into service.