Makita 213311-6 — genuine Makita O‑ring "19" for the HM1100C demolition hammer.
A small black elastomer sealing ring labeled "O‑Ring 19" (nominal 19 mm size), made to replace the worn seal that can cause oil/air leaks in the HM1100C assembly — check your tool’s parts diagram to confirm the exact installation location.
Sold individually and intended as a direct Makita spare parts replacement, this part is ideal when you need the correct fit without modifying housings or other components.
Keep in mind this is one of those small power tool parts that’s inexpensive but critical to restoring reliable hammer performance — perfect to have on hand when you’re repairing a Makita HM1100C.
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