Makita 310178-4 — Genuine Makita Tool Retainer (single piece)
A direct replacement tool retainer for Makita rotary hammers — the small retainer clip that sits inside the chuck/holder assembly to lock the bit in place. This original Makita part is listed on the HR5210C parts breakdown and is the same retainer used in the chuck/tool‑holder assembly on the HR5211C / HR5212C / HR4511C / HM1101C / HM111C series rotary hammers.
Key details
- Part number: 310178-4 — Tool Retainer (sold as an individual retainer).
- Function: secures the bit in the tool holder/chuck cover so the bit is retained during hammering / rotation.
- Installation note: parts diagrams show two retainers used in the tool holder assembly on affected models, so one unit may be required per retainer position.
Why this part
- It’s the original Makita tool retainer specified in Makita Parts List — if the bit retention or chuck locking on your Makita rotary hammer is worn or damaged, replacing this retainer restores proper bit retention and safe operation.
Note: sold and referenced as a single retainer; check your tool’s parts diagram for the number required for your specific model before ordering.
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