Makita PISTON RING 40 HM1200K - 412049-2

Makita 412049-2 — Genuine Makita piston ring (Piston Ring 40). Precision-formed ring with a nominal 40 mm designation that seals the piston in the hammer mechanism to restore proper compression and impact performance.

Compatibility: commonly used in Makita demolition/rotary hammers such as HM1200 / HM1200B / HM1200K and HR5000, HR5000K . Check your tool’s parts diagram to confirm the position and quantity required.

What you’re getting: a single, original Makita replacement piston ring (part no. 412049-2) sized for the piston assembly (marked “Piston Ring 40” in Makita parts lists). Replacing a worn, cracked or deformed ring will stop loss of impact, reduce blow‑by and restore consistent hammering action — install into the piston / striker assembly as per the diagram and ensure proper lubrication of mating parts.

Jump straight to the Makita spare parts diagrams:

• Makita HM1200 Parts
• Makita HM1200K Parts
• Makita HM1200B Parts
• Makita HR5000 Parts

Browse our full range of Makita hammer drill parts.