Makita 310257-8 Spare Part - TOOL RETAINER HR3540/HR3541

Makita 310257-8 — Tool Retainer (original Makita)

Restore positive bit retention in your SDS‑Max rotary/combination hammer with the original Makita 310257‑8 tool retainer. This small, stamped metal retainer (locking ring / bit‑retention clip) seats into the chuck assembly and captures the bit shank so bits stay locked under heavy hammering and rotation. It’s the part that prevents bits from working loose during drilling or chiselling and is commonly replaced when the original clip is bent, worn or broken.

Key details
- Part number: 310257‑8 (Makita).
- Function: metal tool retainer / locking ring for the bit‑holding mechanism (secures SDS‑Max bits in the chuck).
- Construction: durable stamped metal designed to withstand repeated impact and vibration.
- Supply: sold as the single retainer clip — direct fit to the listed Makita chuck assemblies; no machining or modification required.

Example models this part fits (examples only)
- HR3540C, HR3541FC (hammer drills / rotary hammers).
- DHR400 / DHR400ZK (18Vx2 LXT cordless rotary hammer, SDS‑Max).
- HR4013C / HR4003C (corded SDS‑Max rotary hammers) — used in the chuck/retainer assemblies on these models.

If the bit in your Makita SDS‑Max hammer rattles, pulls out, or won’t lock cleanly, replacing the 310257‑8 retainer restores the original retention action without replacing the whole chuck. This is the correct original Makita part number to request when you’re repairing the bit‑holding mechanism on compatible Makita SDS‑Max rotary/combination hammers.

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