Makita 213406-5 — genuine Makita O‑ring (O RING 30). Precision-molded black rubber sealing ring used where a compact, oil/air‑tight seal is required in Makita tool assemblies. The ring measures approximately 30 mm inner diameter and 34 mm outer diameter (cross‑section ≈ 2 mm), supplied as part number 213406‑5.
This O‑ring is used as the cylinder/gearbox seal in a number of Makita rotary-hammer for example: HR2811F / HR2811FT, HR3850K and HR5000K. It’s a simple, direct replacement when the original seal is cracked, flattened or letting dust/oil past, and it installs into the tool’s existing groove to restore proper sealing and performance.
Made as the original Makita rubber O‑ring (black), part 213406‑5 is sized and finished to match the factory seal it replaces — use it whenever the existing ring shows wear to stop leaks and keep your tool running properly.
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