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FUJI “KOSOKU" POWER TOOLS
  • Die Grinder (HSM-380FR/) with mounted wheel
  • Die Grinder (HSM-90) with mounted wheel
  • FUJI Kosuku Hand Die Grinder (HSM-380FR)
  • Size of FUJI Die Grinder (HSM-380FR)
  • FUJI Die Grinder (HSM-90)
  • FUJI KOSOKU HAND Die Grinder (HSM-90) with power cord
  • The advantage of FUJI Die Grinder (HSM-380FR)
  • Die Grinder (HSM-380FR/) with mounted wheel
  • Die Grinder (HSM-90) with mounted wheel
  • FUJI Kosuku Hand Die Grinder (HSM-380FR)
  • Size of FUJI Die Grinder (HSM-380FR)
  • FUJI Die Grinder (HSM-90)
  • FUJI KOSOKU HAND Die Grinder (HSM-90) with power cord
  • The advantage of FUJI Die Grinder (HSM-380FR)

Hand Die Grinder (HSM-380FR/HSM-90)

No.HSM-380FR/HSM-90

Key Features

  • Deep Access: Extended design is ideal for grinding in deep, narrow, and restricted spaces.
  • Ergonomic Grip: Improved body design ensures a secure, comfortable hold to reduce operator fatigue.
  • Precision Collet: High-quality collet chucking system ensures precise control and minimal run-out.
  • Safety First: Double insulation structure ensures safe operation without grounding.
  • Tangle-Free Cord: Vibration-resistant power cord prevents twisting and tangling during complex maneuvers.

Specifications

Specification of Die Grinder HSM-380FR and HSM-90
Global Export Note: When exported 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 in advance to confirm the details.
  • Die Grinder (HSM-380FR/) with mounted wheel
  • Die Grinder (HSM-90) with mounted wheel
  • FUJI Kosuku Hand Die Grinder (HSM-380FR)
  • Size of FUJI Die Grinder (HSM-380FR)
  • FUJI Die Grinder (HSM-90)
  • FUJI KOSOKU HAND Die Grinder (HSM-90) with power cord
  • The advantage of FUJI Die Grinder (HSM-380FR)
  • Description

  • Cautions

  • Electrical Symbol

Overview: Precision Finishing Power

The FUJI Hand Die Grinder Series (HSM-380 / HSM-90) revolutionizes industrial precision grinding. Unlike angle grinders designed for rough stock removal, these straight grinders offer high-speed precision for detailed work.

Compact, lightweight, and equipped with high-torque motors, they are perfect for deburring castings, finishing internal mold surfaces, and smoothing welded parts. The ergonomic grip and anti-vibration design ensure operator comfort during intricate tasks in automotive, manufacturing, and crafting industries.

Fuji HSM-380 Hand Die Grinder Advantage

Select Your Model

1. HSM-380 (Standard 6mm Collet)

The Versatile All-Rounder. A powerful straight grinder ideal for general deburring and internal grinding. Features a vibration-resistant cord for stable operation.

  • Collet Size: 6mm (Standard) / 3mm (Optional)
  • Wheel Capacity: Up to 38mm
  • Best For: Deep hole grinding, mold finishing, and general metalworking.
Spec of Fuji HSM-380 Die Grinder
2. HSM-90 (High Speed Compact)

The Compact Specialist. Smaller and lighter, designed for fine detail work. Its drill chuck type system allows for quick accessory changes.

  • Chucking Capacity: Up to 6mm shaft
  • Features: Small, lightweight, high output
  • Best For: Intricate deburring, narrow spaces, and light finishing.
Fuji Kosoku HSM-90 Hand Die Grinder

Why Choose FUJI Die Grinders?

🎯 Unmatched Precision Engineered with high-concentricity collets (HSM-380) and chucks (HSM-90) to minimize run-out. This ensures smooth grinding and precise control for delicate mold and die work.
⚡ High Output Power Delivers aggressive material removal rates. Even the compact HSM-90 provides high output relative to its size, ensuring efficiency without stalling.
🤲 Ergonomic Comfort Lightweight bodies with improved grip textures reduce operator fatigue. The vibration-resistant cord (HSM-380) prevents tangling, crucial for repetitive workshop tasks.
🛠️ Durability & Reliability Built to withstand heavy industrial use, outperforming competitors in longevity. Ideal for harsh environments like foundries and fabrication shops.

Technical Specifications

Model HSM-380 HSM-90
Collet / Chuck Capacity 6mm (Standard)
3mm (Optional)
Max 6mm Shaft
(Drill Chuck Type)
Max Wheel Diameter 38 mm 25 mm (Mounted Point)
Carbon Brush KD-7 KD-45
Application Internal grinding, Deburring Detail finishing, Light deburring
Specs of Fuji HSM-90 Inner package of Fuji HSM-380
Global Export Note: Voltage configurations are customized based on the destination country. Please specify your local power grid requirements when ordering.

Note for HSM-380: The Ø3mm collet chuck with shaft is sold separately.

Versatile Applications

FUJI Die Grinders are essential for finishing tasks where angle grinders are too bulky:

  • Mold & Die Making: Precision finishing of injection molds and casting dies.
  • Foundry Work: Deburring intricate iron and aluminum castings.
  • Fabrication: Cleaning inside pipes and smoothing weld spatter in tight corners.
  • Restoration: Rust removal and polishing of small automotive parts.
Mounted Grinding Wheels for Die Grinders

Frequently Asked Questions

Q: Can I use 3mm accessories with the HSM-380?
A: Yes, but you need to purchase the optional Ø3mm collet chuck separately. The standard unit comes with a 6mm collet.
Q: What is the difference between a Die Grinder and an Angle Grinder?
A: An angle grinder uses a perpendicular disc for flat surface grinding and cutting. A die grinder (like HSM-380) uses a straight shaft with mounted points or burrs, making it ideal for internal holes, tight corners, and detailed contouring.
Q: What accessories are included with the HSM-380?
A: It typically includes a flat grinding stone attachment, a 38x19xM10-6 flat wheel, the standard collet chuck, mounted wheels (No.14, 15), and mounting spanners.

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.