Makita 643839-4 — Brush holder (6 x 9 mm)

Keep your Makita motor running like new: this genuine Makita brush holder (part no. 643839-4, sometimes listed as 6438394) is the small replacement tray that holds and guides the 6 x 9 mm carbon brushes so they maintain steady contact with the commutator. It’s sold individually and is a direct-fit replacement for the factory brush assembly.

Details & construction

Sized for standard 6 x 9 mm carbon brushes, the holder uses a heat‑resistant body with metal contact terminals and spring support to keep brush pressure consistent and reduce arcing and uneven wear. The part is intended to replace cracked, melted, or otherwise worn holders that cause intermittent power, excessive sparking, or rapid brush wear.

Models it fits

Common compatible models include compact Makita angle grinders and several corded tools — for example GA4030 / GA4034, GA4530 / GA4534, GA5030 / GA5034 — and it’s also listed for some shears, jointers and multi‑tools such as JS1601/JS1602, PJ7000 and TM3000C/TM3010C on parts listings. Confirm your model number against the part listing before ordering.

Quick install note

Replacement is straightforward for mechanically competent users: access the brush caps, remove the old holder and brushes, seat the new 6 x 9 brush in the holder and reassemble (a screwdriver is commonly needed). Replacing a damaged holder typically restores consistent power delivery and extends brush and commutator life.

(Part listed as Makita 643839-4 / 6438394 on multiple Makita parts listings.)

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