Makita part 213231-4 — Oil Seal 15 (genuine Makita). Precision rubber seal designed to keep lubricant in the gearbox/hammer mechanism and keep dust and debris out; labeled "Oil Seal 15" (15 mm bore) and supplied as a single replacement seal. This original Makita part is used on several Makita rotary/demolition hammer models, for example HR4500C, HM1203C, HM0860C and related BHR/DHR series tools, so it’s a direct-fit when that 15 mm seal in the crank/gear area has failed. This genuine Makita oil seal is an essential item among power tool parts when you’re fixing leaks and restoring proper tool performance.
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