Naniwa 210×70×20 mm Gouken Hayabusa 4000 Grit Whetstone, Splash-and-Go, Osaka
Gōuken Hayabusa #4000 Finishing Whetstone – 210×70×20 mm East-West Tools Gōuken Hayabusa #4000 Finishing Whetstone – 210×70×20 mm East-West Tools Gōuken Hayabusa #4000 Finishing Whetstone – 210×70×20 mm East-West Tools Gōuken Hayabusa #4000 Finishing Whetstone – 210×70×20 mm East-West Tools

Naniwa 210×70×20 mm Gouken Hayabusa 4000 Grit Whetstone, Splash-and-Go, Osaka

$95.00

Splash-and-Go 4000 grit finishing stone from Naniwa’s Gouken line, fast polish with minimal prep.
 

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EAST WEST TOOLS QUALITY GUARANTEE

We stand behind the quality of our tools with a 30-day return policy and support for exchanges or repairs when needed.

Read the full policy here.

SHIPPING

We dispatch every weekday from Perth.

Orders over $250 ship FREE — over $100 for our local legends.

Regular: $12.50 | Express: $19.00

Read the full shipping policy here.

Product Care

Proper care keeps your tools performing for decades.
Read the full Guide.

Fast Splash-and-Go Feels, Mirror Polishing Power

The Gouken Hayabusa #4000 grit whetstone delivers a high polish with minimal prep—just splash water and sharpen. Sized 210 × 70 × 20 mm and weighing around 616 g, it's a dense, well-balanced finishing stone perfect for razors, kitchen blades, and precision tools. It cuts smooth, refines edges cleanly, and washes off debris effortlessly.

Made in Osaka by Naniwa, a leading synthetic whetstone manufacturer founded in 1941, the Hayabusa is known for delivering mirror finishes that rival those of higher-grit stones. Daily users praise its polish quality, manageable feedback, and easy maintenance. It is not recommended for ceramic knives.

  • Grit: 4000, ultra-fine finishing level
  • Size: 210 × 70 × 20 mm; Weight: ~616 g
  • Usage: Splash-and-go (no prolonged soaking needed)
  • Maker: Naniwa Gouken series, Osaka, Japan
  • Best paired with 1K or coarser stones for bevel setup

Keep the flatness with a grooved flattening stone and finish edges with ease using our 1000 grit whetstone for gardening shears. Explore more tool sharpening paths in our Yoshioka shears collection. Shipped Australia-wide from Perth.

Customer Reviews

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What Sets Our Tools Apart

Cutting vs Finishing

4000 grit is the ideal finish, faster and cleaner than coarser stones, it’s designed for edge refinement, not reprofiling.

Quick prep, easy cleanup

Splash a little water, sharpen, and rinse. Its dense surface resists clogging and stays sharp longer.

Daily flatness matters

Flatten after every few uses to keep edges consistent, use a flattening stone for the smoothest feel and return.

Naniwa Polishing Industry

Introducing

Naniwa Polishing Industry

Founded in 1941 in Osaka, Naniwa Kenma specializes in bonded abrasives for metalworking and woodworking. Their waterstones are engineered for stable hardness and predictable cutting, with lines tuned for home and professional use.

The Gouken (meaning “strong polish”) line is built for high-precision crime, where feedback, durability, and polish clarity matter most.

Explore Sharpening

Frequently Asked Questions

Do I need to soak this stone?

No. Just splash water on its surface and sharpen immediately. It is designed for quick use.

Is it suitable for ceramic knives?

No. This stone is intended for steel edges only.

How often should I flatten it?

Regularly—after every few passes. It maintains edge clarity and polish quality.

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