Hitachi Retaining Ring - 885-285
Original Hitachi retaining ring — part no. 885285 — a compact stamped circlip used to secure the chamber/piston assembly in Hitachi gas-strip and concrete nailers.
Listed fitment includes NR90GC, NR90GC2, NR90GR2, GFN3490 , NR90GR and NC40G according to factory parts diagrams and parts lists.
The ring snaps into the factory groove to prevent axial movement of the firing assembly and is a common replacement when servicing the nailer — a typical small power tool parts item to keep on hand for repairs.
If you want a direct-fit, original Hitachi retaining ring, order part 885285 as shown in Hitachi parts listings for the NR90/GFN/GNC series; it’s sold individually so you can replace just the single component you need.
Compatible models this part will fit:
