Makita 213128-7 Spare Part - O RING 12 HR2020/2440/2450

Makita 213128-7 — genuine Makita O‑ring (O RING 12). This small sealing ring is the exact Makita replacement listed as “O RING 12” (part no. 213128‑7) and is used where a tight dust/air seal is required inside the hammer/impact mechanism.

What you get: a single original Makita O‑ring sized as the O‑Ring 12 (nominal 12 mm class), ready to drop into the groove around the piston/impact bolt area on affected rotary hammers. It’s the simple rubber sealing part you’d replace when a tool is losing percussion performance or showing oil/dust ingress.

Fits (example models): commonly used in Makita rotary and demolition hammers such as HR2450, HR2440/HR2445, HR2432, DHR171 (and related HK/HR series like HK1820, HR2020, HR140D/DHK180 in parts diagrams). Check your tool’s exploded view to confirm the O‑ring location matches part 213128‑7.

Quick note for installation: press the ring into the groove cleanly (no twisting) and inspect mating surfaces for nicks or build-up—replacing a brittle or torn O‑ring restores the intended sealing and impact action without other changes. Part number: Makita 213128‑7 (O RING 12).

Jump straight to the Makita spare parts diagrams:

• Makita DHK180 Parts
• Makita DHR171 Parts
• Makita HK1820 Parts
• Makita HR2020 Parts
• Makita HR2432 Parts
• Makita HR2450 Parts

Browse our full range of Makita hammer drill parts.