We are currently experiencing substantial delays with Hitachi/HiKOKI and Metabo spare parts due to the two brands merging warehouse. At this moment in time we are unable to provide confirmed delivery dates on out of stock parts, for any urgent requirements please contact us prior to ordering.
Hitachi 996363 — O‑ring (S‑40). A genuine Hitachi rubber O‑ring used as a sealing gasket in the gearbox/piston assembly of Hitachi/Hikoki rotary and demolition hammers; sold as the factory replacement O‑ring S‑40 (part no. 996363).
This original Hitachi S‑40 O‑ring has the standard S‑series dimensions: inner diameter ≈ 39.5 mm and cross‑section (thickness) ≈ 2.0 mm, making it a direct fit where the parts lists call out “O‑RING (S‑40)”. It’s supplied as a flexible elastomer sealing ring, suitable for restoring the tool’s pressure/dust seal.
Fits Hitachi / Hikoki models): DH38MS, DH38YE2, DH38SS, DH40MC, DH40MEY / DH40MRY, DH45ME / DH45MEY rotary / demolition hammers that list item 996363 (O‑RING S‑40). Ideal if you need a genuine Hitachi replacement to finish a repair and get the tool back to spec.
Note: this listing is for the original Hitachi part 996363 (O‑ring S‑40) — a small, inexpensive wearable seal commonly stocked as power tool parts for DH‑series hammers.
