Original 1004691-30 spring — a small, hardened coil spring used in the spindle / clutch assembly of Type‑1 SDS rotary hammers; it replaces the internal spring that sits under the cap / collar and helps control the hammer / ram action.

This genuine part is listed on exploded parts diagrams for several Stanley / Black & Decker rotary‑hammer models — examples include Black & Decker KD1250K and KD1010K, Stanley FME1250 and KFFMED1250 — so it’s a direct-fit replacement when the original spring is worn or broken.

Made to the same form and fit as the factory item, the spring installs beneath the cap / collar and pairs with nearby seals, washers and balls in the hammer assembly; use it to restore correct clutch / impact feel and reliable bit retention.

If you’re repairing a hammer, this genuine DeWalt spare parts item is a simple, low‑profile replacement that returns the mechanism to factory function without altering clearances.

Supplied as the single coil spring (part number 1004691‑30), it’s one of the common small power tool parts you’ll find on the Type‑1 rotary‑hammer diagrams — match the part number on your exploded view to confirm fit.