Original Makita 421570-0 — retaining (snap) ring R‑36 designed to secure the tool‑holder/bit assembly in Makita demolition hammers.
Commonly fitted to the Makita HM1100C (this part number is also listed alongside HM1130 in some parts listings), so check your model’s parts diagram to confirm fit before installing.
Function and form: it’s a spring/retaining ring (R‑36) sized to the 36 mm standard groove/diameter used in the tool’s holder hardware; typical R‑36 rings are spring‑steel and have a working thickness around 1.5–1.75 mm.
If the original ring is distorted, cracked or has lost its spring tension the holder can come loose — replacing with this original Makita 421570‑0 restores the correct retention and alignment of the bit/holder assembly.
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