Genuine DeWalt brush spring (part 645650-00) — a direct replacement spring for a number of DeWalt angle grinders.

This small metal tension spring keeps the carbon brush pressed firmly against the commutator to maintain consistent electrical contact and motor performance; it’s the part that often fails or loses tension as brushes wear.

Compatible with many DeWalt grinders including model families D28490, D28491, D28492, D28493 and the DWE49x series (DWE490, DWE492, DWE493, DWE494, DWE496, DWE497) — check your grinder’s type label to match the exact variant.

Sold as the single replacement spring and ready to install in the brush holder under the brush cap, this genuine DeWalt spare is an inexpensive way to get a grinder back to reliable operation using authentic DeWalt parts.