Genuine DeWalt Spindle Assembly — part 659417-00SV. Direct-fit replacement spindle for DeWalt circular saws; restores a worn or damaged output shaft so the blade runs true and the gear train engages correctly. The assembly is the factory-style spindle used in DeWalt 18V/corded circular saw families and comes ready to install with the stepped shaft and threaded arbor end that accepts the original blade flange and retaining hardware.

This spindle is the same service assembly called out in DeWalt parts diagrams and drops into the saw’s bearing/gear area without machining or modification — just remove the blade and arbor nut, swap the old spindle for the new unit, and reassemble. It’s designed to match the original mating surfaces and bearing seats so alignment and concentricity are preserved.

Example models this part is listed to fit include DC390 , DCS391, DCS373, DCS372, DC390B and some DCS565. Check your saw’s parts diagram or model / type plate against part number 659417-00SV to confirm fit before installing.

If you need a reliable replacement to get a saw back to serviceable condition, this is the original DeWalt spindle assembly specified for those models and intended to restore proper blade mounting and drivetrain engagement.