Makita 254239-9 Spare Part - KEY 4 HR3000C

Makita 254239-9 — Key 4 (feather / woodruff key)

Small but critical replacement: this original Makita half‑moon (feather/woodruff) key (part no. 254239-9, also shown as "Feather Key 4") fits into the crankshaft/keyway to lock gears and shafts together, restoring positive drive between the crank and gear assemblies.

Exact size: L ≈ 10 mm × thickness/height 4 mm (listed as L10 / h4 mm), the precision‑formed key replaces the worn or missing half‑moon key used in the gearbox/crank area.

Example model compatibility: used in a range of Makita rotary hammers and combination hammers — common examples include HR3000C, HR3550C, HR2800, HR3012FC and DHR400 (among others listed in Makita parts diagrams). Confirm by matching part number 254239-9 or the "feather key" position on your tool’s parts breakdown.

Why this part matters: as an original Makita spare, this tiny key prevents gear slippage or off‑timing after crank or gear service — an inexpensive replacement that usually resolves loose or non‑driving shafts without further overhaul.

Note: this product is a specific replacement component for Makita tools and is commonly stocked under power tool parts listings — verify your tool’s model number against the parts diagram before ordering.