Hitachi 320239 Switch with Safety Lock G18Mr — main product image

Hitachi 320239 Switch with Safety Lock G18Mr

Hitachi

Hitachi 320239 Switch with Safety Lock G18Mr

Name: Hitachi 320239 Switch with Safety Lock G18Mr
Brand: Hitachi
SKU: 320239

★★★★★5.0 (2 reviews)

Genuine Hitachi 320239 replacement switch with safety lock restores reliable trigger operation to your G18Mr grinder.

$27.61*

✓ In Stock on Amazon.com

View on Amazon

*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

The Hitachi 320239 Switch with Safety Lock is a genuine OEM replacement component engineered specifically for the Hitachi G18Mr grinder. When the original trigger switch on your G18Mr wears out, becomes unresponsive, or the safety lock mechanism fails, this part provides a direct drop-in replacement that restores the tool to its original operating condition. Because it is a factory-spec part from Hitachi (now branded as Metabo HPT), it matches the exact electrical ratings and physical dimensions of the original switch.

The integrated safety lock is a critical feature of this switch — it prevents the grinder from being accidentally powered on, which is essential when working with a high-powered disc grinder. Installing this replacement involves opening the tool housing and swapping the old switch assembly, a process that is straightforward for anyone familiar with basic power tool repair. For G18Mr owners looking to extend the life of their grinder rather than replace the entire tool, this genuine switch is the correct service part to restore full and safe functionality.

Key Features

Hitachi Power Tools has renamed to Metabo HPT. Same great tools, with only a new name.

Genuine Hitachi power tool replacement part

For use on Hitachi power tool products

Specifications

Brand

Hitachi (Metabo HPT)

Part Number

320239

Type

Switch with Safety Lock

Compatible Tool

Hitachi G18Mr

OEM Status

Genuine Hitachi replacement part

Pros & Cons

👍 Pros

Genuine OEM part ensures exact fit and proper function in the Hitachi G18Mr grinder.
Integrated safety lock prevents accidental trigger activation during operation or storage.
Direct replacement restores original trigger response and reliability without modification.

👎 Cons

Only compatible with the Hitachi G18Mr model, so it cannot be used across other Hitachi grinders.
Requires disassembly of the grinder to install, which may be challenging without technical experience.
Minimal product documentation included, so users may need to reference a service manual for installation steps.

Frequently Asked Questions

What Hitachi power tool is this switch compatible with?

This switch is specifically designed for the Hitachi G18Mr grinder. It is a genuine OEM part (part number 320239) and may not fit other models.

Is this an OEM Hitachi part or an aftermarket replacement?

This is a genuine Hitachi (now Metabo HPT) OEM replacement part, not an aftermarket or third-party component.

Does this switch include the safety lock feature?

Yes, the 320239 switch includes the integrated safety lock mechanism that prevents accidental activation of the G18Mr grinder during use.

Has Hitachi Power Tools changed its name?

Yes, Hitachi Power Tools has rebranded to Metabo HPT. The tools and replacement parts remain the same; only the brand name has changed.