Genuine Makita rubber washer — part no. 424364-2. Precision-moulded rubber sealing/cushion washer listed by Makita as "RUBBER WASHER 16" and used around the tool-holder / chuck area on several Makita rotary/combination hammer models.
Details: resilient rubber construction designed to tolerate vibration and to help seal and retain lubricant at the tool-holder/chuck interface; sold as a single replacement washer (quantity 1 in the parts breakdown). The part is identified in Makita parts diagrams simply as "Washer 16" / "Rubber Washer 16" — nominal size shown in the parts lists as 16 (metric).
Example compatible models (examples from Makita parts lists and exploded diagrams): DHR242, DHR281, HR002G, HR004G, HR2300 / HR2300-2, HR2600 / HR2601, HR2610 / HR2611F, MT870 and BHR242. Verify the part number against your tool’s parts diagram — 424364-2 appears as the washer in the tool-holder/chuck area on these models.
Quick reason to choose this part: if the original washer is hardened, torn or missing it can allow lubricant loss, increased noise or degraded hammer action — replacing it with the original Makita 424364-2 restores the intended sealing/cushion fit without modifying the tool.
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