Original Makita part 213117-2 — listed as O‑Ring 11 in Makita parts diagrams — a small sealing ring used in the striker/piston assembly of several Makita rotary / hammer drills.
Nominal size: approximately 11 mm inner diameter with a ~3.5 mm cross‑section (standard O‑ring sizing for this application).
Fits/examples: referenced in parts breakdowns for models such as HR2410 , DHR182, and HR2420, HR2010 and HR2431 series diagrams — useful to check against your tool’s parts list for confirmation.
If your hammer drill is leaking grease or losing hammer action, this genuine Makita O‑ring is the direct replacement called out on the diagrams — a simple, low‑cost way to restore the seal. Keep one with your spare power tool parts so you can get the tool sealed and back in service quickly.
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