Hitachi O-ring (c) - 313-396
Original Hitachi part 313396 — O‑ring (C), a small but critical sealing ring for rotary hammers and demolition hammers. This genuine Hitachi rubber O‑ring fits into the retainer/sleeve groove to seal and cushion the hammer assembly during operation.
Dimensions: 20 × 26 × 3 mm (inner Ø × outer Ø × thickness), made from a flexible sealing compound suited for impact/hydraulic service in hammer tools. It’s the exact replacement shape used in the hammer/retainer area and installs by seating into the corresponding groove.
Typical models this part is used on (examples): Hitachi/Hikoki DH40MRY, DH40MA, DH40MB, DH40MR, DH38MS, DH38SS, H41MB2 and similar rotary/demolition hammers where the parts diagram lists 313396.
Compatible models this part will fit:
