Hitachi O-ring (i.d 59.92) - 885-316

Hitachi 885316 — Original Hitachi O‑ring (I.D. 59.92 mm, cross‑section 3.53 mm). This genuine Hitachi sealing ring fits the cylinder/head area of gas/concrete strip nailers to restore a reliable pressure seal and stop leaks — an essential replacement when a nailer starts misfiring or losing power. The part is listed as the top O‑ring for Hitachi/Hikoki gas nailer assemblies and is supplied as the correct, ready‑to‑install sealing element.

Fits (examples): Hitachi NR90GC / NR90GC2 / NR90GR2 and compatible concrete/gas nailers such as NC40G / GNC40 — check your tool’s parts diagram for the 885‑316 reference to confirm exact placement.

Why choose this part: it’s the original Hitachi replacement specified for the nailer’s sealing system, sized at I.D. 59.92 mm with the industry standard 3.53 mm cross‑section for a precise fit. Easy to swap into the cylinder/head groove during routine repairs — a small part that restores dependable performance. This genuine Hitachi O‑ring is a common repair item among power tool parts for framing and concrete nailers.