Genuine Makita 213757-6 — O‑RING 80. This original Makita rubber sealing O‑ring (part no. 213757‑6) is the exact replacement used in the gear/hammer barrel area of several Makita angle grinders and demolition hammers to retain lubricant and keep dust/debris out of bearings and the impact assembly. It’s listed on Makita parts diagrams and fits models such as 4114S / 4112HS, 9079S / 9077S and HM1802 / HM1812 (including HM1812X3).

Sold individually and supplied as the O‑RING 80 size on Makita part breakdowns — a straightforward press‑in replacement when your existing ring is cracked, flattened, or allowing grease/oil to leak.