Constant Speed, Maximum Productivity

FUJI “KOSOKU” High-Freq Unstoppable Power
  •  Portable High Frequency Angle Grinder (HGC-250Ⅱ) with Fuji Super F2 Grinding Wheel
  • Grinding work of 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • size of High Frequency Angle Grinder (HGC-250Ⅱ)
  •  Portable High Frequency Angle Grinder (HGC-250Ⅱ) with Fuji Super F2 Grinding Wheel
  • Grinding work of 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • size of High Frequency Angle Grinder (HGC-250Ⅱ)

4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)

No.HGC-250Ⅱ

Key Features

📏 Compact & Lightweight Small and easy to carry yet powerful, reducing operator fatigue during long shifts.
⚡ High Efficiency Designed to maintain high rotational speed even with light thrusting force, boosting productivity.
🎯 Excellent Stability Engineered for smooth operation and stability, ensuring precise grinding results.
🚀 High Speed Capable Optimized for use with 80 m/s (4,800 m/min) peripheral speed wheels for rapid material removal.

Specifications

Specs of 4 inch (100mm) Portable High Frequency Angle Grinder HGC-250II
Global Export Note: When exporting to other countries and regions, we will make corresponding changes according to the local power grid electricity standards for our equipment and tool. Please contact us to confirm the details in advance.
  •  Portable High Frequency Angle Grinder (HGC-250Ⅱ) with Fuji Super F2 Grinding Wheel
  • Grinding work of 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • 4 inch (100mm) Portable High Frequency Angle Grinder (HGC-250Ⅱ)
  • size of High Frequency Angle Grinder (HGC-250Ⅱ)
  • Description

  • Cautions

  • Electrical Symbol

Overview: Redefining Grinding Efficiency

The FUJI HGC-250Ⅱ High Frequency Angle Grinder represents a paradigm shift in industrial grinding efficiency. Engineered for durability and operational agility, this 4-inch (100mm) powerhouse is designed to meet the rigorous demands of modern foundries, shipyards, and heavy metal fabrication.

Unlike standard electric tools that slow down under pressure, the HGC-250Ⅱ utilizes 250Hz High-Frequency Technology to maintain constant rotational speed, ensuring rapid material removal and consistent finish quality.

FUJI HGC-250II High Frequency Angle Grinder 4 Inch

Key Technical Advantages

⚡ No Speed Drop (Constant RPM) Powered by a three-phase squirrel cage induction motor, the HGC-250Ⅱ maintains peripheral wheel speeds of 8700RPM/min. It is engineered for less than 0.5% speed variance under full load, boosting productivity by over 20%.
🛡️ Durability & Low Maintenance With no commutator or carbon brushes to replace, the induction motor design extends maintenance intervals by 40% compared to standard DC motor tools. It is built to withstand dust and continuous heavy-duty operation.
📏 Compact Powerhouse Weighing only 2.0kg,  it is approximately 30% lighter than comparable industrial grinders. The compact design (272mm length) ensures operator comfort during prolonged use without compromising structural integrity.
⚙️ Advanced Safety Compliant with JIS strict standards, featuring an ergonomic body design and optional safety guards. The robust construction minimizes vibration, reducing the risk of White Finger Syndrome (HAVS).

Technical Specifications

Model Wheel Size (mm) No Load Speed (min⁻¹) Power Supply Current Power Cons. Weight Spindle
HGC-250Ⅱ 100 x 6 x 15 8700 / 9000 200V / 240-250Hz 2.4 A 500 W 2.0 kg M10 x 1.5
Dimensions of HGC-250II High Frequency Grinder
⚠️ System Requirement: Power Supply
This tool requires a High Frequency Generator (Frequency Converter) to operate. It cannot be plugged into standard 50/60Hz wall outlets.
Recommended Power Supply: FG-505NE / FG-605NE High Frequency Generator.

Ideal Industrial Applications

The HGC-250Ⅱ is the preferred choice for sectors requiring rapid metal removal and 24/7 reliability:

Foundry & Casting Rapid removal of gates, risers, and parting lines on iron and steel castings.
Metal Fabrication Smoothing heavy weld seams and beveling plate edges for preparation.
Heavy duty grinding work in foundry with Fuji HGC series
Global Export Note: When exporting to Europe, the Middle East, or other regions, we can customize the equipment voltage and plug type to match local power grid standards. Please contact us to confirm details.

Frequently Asked Questions

Q: What is the benefit of a 250Hz High Frequency grinder?

A: The main benefit is productivity. Unlike standard grinders that slow down when you press them against metal, the HGC-250II maintains its 72m/s speed under load, removing material much faster and reducing worker fatigue.

Q: Does this grinder include a grinding wheel?

A: No, wheels are sold separately. We highly recommend using Fuji's Green Star Semi-Flexible Grinding Wheels for the best balance of speed and finish.

Q: Can I plug this into a regular outlet?

A: No. You must use a High Frequency Generator (Inverter) to convert your power to 3-phase 200V 250Hz. Connecting directly to 50/60Hz power will damage the motor.

FUJI Industrial Quality & Safety Protocols

Fuji products are manufactured following strict Japanese standard process requirements. Every wheel is engineered to meet or exceed JIS (Japanese Industrial Standards), such as JIS R 6242 and B 4051. Our core engineering logic prioritizes maximum operator protection by maintaining safety factors and burst speed capabilities that often surpass the highest industry benchmarks.

Standard RegionSafety Factor (Burst Multiplier)Safety Logic & Benchmark
FUJI (High Precision)> 2.0xEngineered to exceed JIS requirements for maximum reliability.
Japan (JIS R 6242)2.0xExtreme Safety: A wheel rated at 80m/s must withstand a 160m/s burst test.
Europe (EN 12413)$1.73xRisk Balanced: Provides high safety redundancy for most industrial apps.
USA (ANSI B7.1)1.5xEfficiency Focused: Relies on machine guarding and operational procedures.

⚠️ Essential Safety Cautions & Operational Integrity

  • 1. RPM Compliance: Never exceed the maximum R.P.M. specified on the wheel. Using the sides of the wheels for grinding is strictly prohibited, as it compromises the structural integrity of the abrasive bond.
  • 2. Mandatory Idling: Allow the tool to idle for one minute before beginning work. If a new wheel has been mounted, an idle run of three minutes is required to ensure dynamic stability.
  • 3. Workpiece Stability: All materials must be securely fastened. Improperly secured workpieces can lead to vibration, wheel binding, and unsafe kickback forces.
  • 4. Arbor Hole Integrity: Do not modify or enlarge the metal center of the arbor hole. A proper fit is critical; a mismatched arbor causes eccentric rotation and dangerous vibration levels.
  • 5. PPE Requirements: Industrial-grade face and eye protection are mandatory at all times. Ensure all protective gear meets local safety compliance standards.
  • 6. Guard Protection: Protection guards are designed to contain fragments in the unlikely event of a wheel failure. Never operate tools or machinery with guards removed.

Applications of Abrasives & Usage Notes

Abrasive Selection Guide

FUJI Abrasive Selection Table

Selection of grains (A, WA, AZ, etc.) based on material hardness and grinding precision.

Warning Symbol Interpretation

FUJI Usage Symbols and Cautions

Standardized safety icons for safe operation and protection guard usage.

Professional Export & Maintenance Insight

When deploying Fuji high-performance tools in overseas markets, ensure that the regional power grid frequency and voltage match the tool specifications. To maintain the superior burst speed safety of Fuji wheels, store abrasives in a dry, temperate environment. Humidity can degrade the resin bond, potentially lowering the wheel’s resistance to centrifugal forces.

🛡️ Electrical Appliance & Safety Compliance

This product strictly complies with the Electrical Appliance and Material Safety Technology Standards (Noise Countermeasures), revised under the Ministry of Economy, Trade and Industry (METI) Ordinance No. 57.

*Official Enforcement Date: April 1, 2013. This ensures maximum electromagnetic compatibility (EMC) and operational stability in industrial environments.

How to Read Operational & Safety Symbols

Fuji Tool Safety Symbols Chart

Key Safety Indicators:

  • Double Insulation: Marked by the "square-in-a-square" symbol, indicating no grounding is required for safe operation.
  • Noise Suppression: Compliance with Ordinance No. 57 prevents interference with other electronic equipment.
  • Mandatory PPE: Visual cues for hearing, eye, and respiratory protection.

Professional Note: For global industrial procurement, these Japanese METI standards ensure that Fuji tools meet high-level noise reduction requirements, critical for precision workshops across Europe and North America.