Hitachi Dust Seal - 310-998

Hitachi 310998 — Genuine Hitachi dust seal for disc grinders and cutters. This molded rubber/plastic dust seal fits around the tool spindle/guard to keep abrasive dust and debris away from bearings and gears, restoring proper protection and smooth operation. Stocked among common power tool parts, the 310998 is a straightforward, long-lasting replacement that slips into the guard/housing for a secure push-fit.

Compatible examples: fits Hitachi disc grinders and cutters such as G18SE2, G18SG, G18SH, G18U / G18UA / G18UB, G23SC2, G23SE / G23SF / G23U / G23UA, and portable cutters like CC12Y and CM12Y and P20SD. Use this part when you see dust getting into bearings, wobble, or unusual grinding noise.

Quick notes for installation: remove the guard or housing per the tool manual, clean the mating surface, and press the seal into place until flush — no special tools required for most models. Re-check guard alignment and run the grinder briefly to ensure the seal seats correctly. If you want the exact placement in your model, consult the Hitachi parts diagram for your tool.