Original Makita lock ring — part number 450691-1 — designed to restore the retaining fit on BFS-series drywall screwdrivers. Fits Makita models BFS440, BFS450 and BFS450Z and installs in the tool’s retaining groove to hold the collar/bit housing securely in place.
This compact, machined locking ring replaces the factory component and is made to the same fitment and tolerances as the original Makita part, so it seats cleanly and prevents axial play that can cause wobble or premature wear.
Simple to fit during routine service — remove the outer housing, drop the ring into the groove and reassemble — a straightforward repair that gets your BFS driver back to factory alignment. This genuine Makita spare is a small but essential Makita parts item when servicing BFS-series screwdrivers.
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