Original Makita retaining ring 961005-4 (also listed as Retaining Ring S-9 / snap ring) — a small hardened spring-steel circlip designed to lock components axially on a shaft or inside a bore, commonly used on Makita grinders and similar power tools.
Key dimensions: sized for a 9 mm shaft (nominal), with an approximate inner diameter of 8.4 mm and a material thickness of about 1.0 mm (DIN 471 / S‑9 sizing), so it fits into the corresponding shaft groove and resists axial movement under vibration.
Material and use: made from spring steel for fatigue resistance; it secures bearings, gears, collars and other spindle components on angle‑grinder and small‑engine shafts and is removed/installed with standard circlip/snap‑ring pliers.
Example Makita models this part is listed as fitting include BGA450, BGA452, GA4540C / GA4542C, GA5040C, DGA452 (and several related angle grinders and small engine tools that use a S‑9 retaining ring).
If your tool’s spindle groove takes a 9 mm (S‑9 / DIN 471) external circlip and the part number 961005‑4 matches your parts diagram, this original Makita retaining ring is the correct direct replacement to restore secure axial retention on the shaft.
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