Genuine Hitachi replacement switch (part no. 311-739 / 311739) for a range of Hitachi/Hikoki angle grinders — a single-pole (1P) screw-terminal power switch without a lock‑on feature. Designed as a direct electrical replacement in the switch cavity used on Hitachi 115 mm and 125 mm disc grinders, the unit uses screw-type wire connections for a straightforward swap.

This switch is listed for Hitachi/Hikoki models such as G12SE2 (115 mm) and G13SE2 (125 mm); wider compatibility listings also include related G12/G13/G15 series variants (for example G12VA, G13SP, G13V, G13VA, G13YC2, G13YF, G15VA, G15YC2 and G15YF in supplier fit lists). Use this part number when matching the replacement to the grinder model and the existing switch form factor.

What you get: one original Hitachi 1P screw‑type switch (no lock). The simple screw‑terminal design keeps installation quick — remove the old switch, transfer the conductors to the matching screw terminals, and secure the new switch into the grinder’s switch box. Because this is the original Hitachi part number for these grinders, it restores the factory switching behavior and fitment.

Compatible part references often shown by suppliers include 311739 and HKK311739; confirm the part number stamped on your old switch or in your grinder’s parts list before fitting.