Genuine Makita Washer — part number 253825-3. This is a small flat/countersunk metal washer with a 6 mm bore (listed as “Washer 6” / d‑6mm in Makita parts diagrams), used to secure fasteners on several Makita sanders and reciprocating saws.
What it does: it sits under a countersunk or hex fastener to distribute load and keep sanding plates, housings or blade assemblies running true — replacing a worn or missing 253825-3 restores proper clamping and reduces vibration or loosening. (Shown as item #19 in the Makita exploded views for affected models.)
Fits (example models): BO4510, BO4540, BO4550 / BO4552 / BO4553 / BO4554, BO4560 / BO4561 (finishing/orbital sanders), model 9036, and reciprocating saws DJR186, DJR187 and DJR360. Use these examples to confirm fit against your tool’s parts diagram.
Notes: sold as the single replacement washer (Makita reference 253825-3 / 2538253). This is an original Makita part listed in official parts breakdowns for the models above — install it in the same position shown in the diagram to restore correct fastening.
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