Makita 310145-9 Spare Part - LOCK RING HM0860C/0870C/0871C
Genuine Makita Lock Ring — part number 310145-9. A single, durable metal retaining ring that secures the tool‑holder / nose assembly on Makita SDS‑Max demolition hammers, keeping internal components seated during heavy impact work.
Fits Makita models HM0860C, HM0870C and HM0871C (listed as item 11 in the Makita parts breakdown).
Why this part matters: the ring prevents looseness and movement under vibration, restoring correct seating of the chuck/tool holder and helping maintain impact efficiency and tool life. It’s sold individually and intended to replace worn or distorted locking hardware during routine servicing.
If you’re working from the Makita parts diagram during a repair, this original Makita lock ring is the exact replacement called out for those models and is a straightforward swap to get the hammer back to safe, reliable operation. This part is commonly referenced in Makita parts listings for demolition hammers and is one of the small but essential power tool parts to check when diagnosing looseness in the nose area.
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Compatible models this part will fit:
