Original Makita 345280-4 — Hex washer (genuine Makita). This is the hex (hexagonal) metal washer used with an M8 hex bolt (for example the M8 x 120 bolt) to secure the grip/handle and related assemblies on several Makita percussion drills and compact rotary-hammer models.
Common models that use part 345280-4 include HP1621 / HP1621K, HP1620, HP1631 and s HP2050 / HP2050F and HP2070F
Details you’ll want to know for repair: the washer has a hex-profile (designed to sit with a hex bolt head and resist turning), a bore sized to fit an M8 fastener (Ø ≈ 8 mm), and is a durable metal washer intended to maintain correct spacing and a secure clamp under vibration. It is listed and sold as Makita part number 345280-4.
If you need the exact fit for a particular model year or regional variant, check your tool’s parts breakdown to confirm this item number appears in that model’s diagram — 345280-4 is shown on Makita parts sheets where the M8 hex bolt and grip/handle assembly are used.
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