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.
Original Hitachi urethane ring — part number 981859 — engineered as the cylinder-cap seal for Hitachi rotary/demolition hammers.
Molded from resilient urethane, this ring restores an air‑tight seal inside the cylinder cap so the hammer maintains impact pressure and smooth operation; it’s the small but vital replacement that stops air leaks and loss of hammer performance.
Fits models which include : DH38YA, DH38YE, DH40FR, DH40MA, DH40MB, DH40MR and DH40SR.
This is sold as the single replacement urethane ring made for Hitachi (manufactured for Hitachi by Metabo HPT / HiKoki) and installs in the cylinder cap location shown on exploded parts diagrams — an easy swap during routine service to get your tool sealing and hammering like new.
If you need a reliable power tool parts replacement for a Hitachi rotary hammer that’s losing blow force or exhibiting air leaks, this original Hitachi 981859 urethane ring is the exact seal specified for those models.
