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 Use a wheel with a marked maximum speed at least as high as the machine speed, with dimensions and type approved for this tool. The wheel rating is not the machine's operating speed.

Specifications

Specs of 4 inch (100mm) Portable High Frequency Angle Grinder HGC-250II
Global Export Note: Confirm the 200V high-frequency supply and the exact 240/250Hz nameplate configuration before ordering. A plug change does not permit direct connection to 50/60Hz mains.
  •  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.

The HGC-250Ⅱ uses a brushless squirrel-cage asynchronous induction motor and requires a matching high-frequency supply. Select the exact voltage and frequency according to the tool nameplate.

FUJI HGC-250II High Frequency Angle Grinder 4 Inch

Key Technical Advantages

⚡ High-Frequency Induction Motor A three-phase induction motor operates without carbon brushes or a commutator. The listed 8700 / 9000 min⁻¹ values are no-load rotational speeds, not a guarantee of constant speed under load.
🛡️ Durability & Low Maintenance The brushless design removes brush and commutator replacement tasks. Bearings, gearing, cooling paths and electrical connections still require maintenance according to the operating instructions.
📏 Compact Powerhouse Weighing only 2.0kg, the tool has a compact 272 mm body length for access and handling.
⚙️ Advanced Safety Use the specified guard and approved wheel dimensions. Assess actual vibration exposure and operating time; this tool does not guarantee prevention of HAVS.

Technical Specifications

Model Wheel Size (mm) No Load Speed (min⁻¹) Power Supply Current Power Cons. Weight Spindle
HGC-250Ⅱ 100 × 6 (4) × 15 8700 / 9000 200V / 240-250Hz 2.4 A 500 W 2.0 kg M10 × 1.5 × 9.0 mm
Cord / plug 5 m cord with 4-pole plug; confirm connector compatibility
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 demanding industrial tasks:

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: Confirm the tool voltage, frequency, converter output and connection before ordering. A different plug does not make this tool compatible with an ordinary mains outlet or a 300Hz supply.

Frequently Asked Questions

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

A: The brushless induction motor is designed for operation with a matching high-frequency supply. With a 100 mm wheel, the listed no-load speeds of 8700 / 9000 min⁻¹ correspond to about 45.6 / 47.1 m/s. The catalogue reference to 72 m/s concerns compatible wheel speed capability, not a constant operating speed under load.

Q: Does this grinder include a grinding wheel?

A: The catalogue lists a wheel and spanner as accessories. Confirm the supplied wheel specification with your order. For alternative abrasives, match the approved dimensions and speed rating.

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 Region Safety Factor (Burst Multiplier) Safety Logic & Benchmark
FUJI (High Precision) > 2.0x Engineered to exceed JIS requirements for maximum reliability.
Japan (JIS R 6242) 2.0x Extreme Safety: A wheel rated at 80m/s must withstand a 160m/s burst test.
Europe (EN 12413) 1.73x Risk Balanced: Provides high safety redundancy for most industrial apps.
USA (ANSI B7.1) 1.5x Efficiency 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.

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 Region Safety Factor (Burst Multiplier) Safety Logic & Benchmark
FUJI (High Precision) > 2.0x Engineered to exceed JIS requirements for maximum reliability.
Japan (JIS R 6242) 2.0x Extreme Safety: A wheel rated at 80m/s must withstand a 160m/s burst test.
Europe (EN 12413) 1.73x Risk Balanced: Provides high safety redundancy for most industrial apps.
USA (ANSI B7.1) 1.5x Efficiency 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.