Makita 424134-9 Spare Part - DUST SEAL BFS440/450

Original Makita dust seal ring — part number 424134-9 — designed for the nose/depth-adjustment area on Makita’s BFS450/BFS450Z 18 V LXT cordless drywall screwdriver models.

This small, flexible elastomer sealing ring keeps dust and fine debris out of the depth-adjustment cone and gear area to protect brushes, bearings and internal components, restoring smooth operation and preventing premature wear.

The ring is supplied individually and installs with a simple press-fit during nose-cone or depth-adjustment disassembly — an easy swap if the original is torn, flattened or hardened.

As an original Makita spare parts item matching the factory part number 424134-9, it’s the exact dust-seal geometry the tool was built with, so you won’t have to rework the nose assembly to fit it.

A compact, low-cost power tool parts replacement that prevents more expensive repairs by keeping grit out of critical mechanisms.

Browse our full range of Makita screwdriver parts.