Original Makita Ring 11 — part number 327516-3. Precision metal retention ring used in the piston/hammer assembly of Makita SDS‑plus rotary hammers.
Fits select Makita models HR3001C, HR3011FC and HR3012FC (check your model’s parts breakdown for exact placement).
Physical detail: approximately 11 mm internal diameter × 18 mm external diameter (listed as 11 × 18 mm), designed to seat against the piston / sleeve and restore correct alignment and contact clearances. This original Makita replacement is referenced in Makita parts for the HR3000-series hammers.
Sold as a single replacement ring — install when the existing ring shows wear, grooves, or deformation to help return smooth hammer action and proper piston fit.
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