High Frequency Grinders & HF Systems | KOSOKU Japan

300Hz High Frequency Grinders & HF Power Systems

Why Choose High Frequency Tools? Constant Speed & Max Productivity
The Working Principle: Why High Frequency Matters
Standard electric grinders suffer from speed drops (RPM loss) when heavy load is applied, significantly slowing down production. Fuji KOSOKU High Frequency Grinders solve this by operating with a specialized High Frequency Converter.
  • Constant Speed: Our tools maintain high torque and stable RPM even under the heaviest loads.
  • Superior Efficiency: Operating at 250Hz, 300Hz, or 400Hz, these motors deliver output comparable to much heavier standard angle grinders.
  • Safety & Durability: Engineered in Japan for permissible overload protection, ensuring operator safety in demanding Shipyard and Foundry environments.
System Configuration Required
3-Phase Power Source Frequency Inverter High Frequency Tool
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See the Power: High Frequency in Action

Watch the live demonstration of Fuji KOSOKU High Frequency Grinders tackling heavy-duty applications. Witness the unstoppable torque and constant speed capabilities that allow operators to remove material faster and smoother—whether using the 400Hz series for mobile flexibility or the 300Hz models for continuous, fixed-station operations. A more powerful 230mm/9" HF grinder for foundry is under development. Please be patient.

FUJI KOSOKU High Frequency Angle Grinder, proven in Japan to deliver stable torque, ultra-fast grinding speeds

FUJI Complete High Frequency Grinding Systems

Fuji KOSOKU offers a robust lineup of 180mm (7") and 100-125mm (4"-5”) HF grinders designed to outperform standard tools. By eliminating the internal commutator, our high-frequency motors not only reduce maintenance but deliver Constant Speed under load. This technology achieves 3x to 5x higher stock removal efficiency compared to 50Hz/60Hz angle grinders, making them the ultimate solution for rapid surfacing on steel, cast iron, and weld seams.
Required Power Sources

To operate these high-performance tools, a dedicated power source is required to convert standard power to High Frequency:

  • HF Inverters: Compact mechanical/digital converters perfect for factory integration.
  • Frequency Generators: Rotary converters providing stable power for multiple tools simultaneously.
Industrial Applications
  • Heavy Metal Fabrication: Where speed and material removal rates are critical.
  • Shipbuilding Repair: For continuous heavy grinding and surface preparation.
  • Foundries: For aggressive fettling and deburring of castings.
Ready to upgrade your production line? Contact Technical Team