Makita part 213258-4 — genuine Makita O‑ring (17.5 mm). A direct replacement sealing ring used in Makita rotary hammer/combination hammer assemblies (placed at piston/cylinder and guide-plate joints), supplied as the original Makita service part to restore proper sealing and impact performance. The O‑ring is listed as "O RING 17.5" under Makita part number 213258-4.
Fits many Makita hammer/drill models including (examples) BHR243, BHR242, HR2300, HR2600, HR2610/2611 series, DHR242/DHR280–DHR283 series, HR2651, HR2650 and HR2631F — refer to the exploded parts diagrams where 213258-4 is shown in the piston/cylinder and guide‑plate locations.
Sold individually and ready to install: if your tool shows oil/air leaks, reduced hammering action, or loss of compression, replacing this genuine Makita 213258-4 O‑ring (17.5 mm ) restores the original sealing geometry and fit.
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