Koutetsu Chromax RO Boss Sujihiki 240mm

Experience Effortless Precision in a Chromax Stainless Sujihiki

The Koutetsu Chromax RO Boss Sujihiki 240mm is crafted by Takayuki Shibata in Fukuyama, Japan - a long, slender slicing knife that combines the edge-holding performance of high-hardness Chromax steel with the low-maintenance appeal of stainless cladding. Built for cooks who demand clean, single-stroke slices through proteins without tearing or dragging.

The Specs

• Steel: Chromax stainless steel core, stainless steel cladding (sanmai)
• Finish: Migaki (polished)
• Hardness: 63-64 HRC
• Blade length: 240mm
• Handle: Rosewood with pakkawood ferrule
• Origin: Fukuyama, Japan

The Sujihiki

Koutetsu knives are designed by Takayuki Shibata - one of Japan's foremost knife sharpeners and craftsmen - with an uncompromising focus on thinness behind the edge and exceptional cutting geometry. The Chromax RO Boss series uses Chromax stainless steel, a high-hardness stainless alloy that achieves 63-64 HRC without the reactive nature of carbon steel. The sanmai construction wraps the hard Chromax core in stainless cladding, protecting the blade flats and making the knife easy to maintain. The sujihiki is the Japanese equivalent of a Western slicing or carving knife - its long, narrow blade and minimal surface contact allow it to glide through roasts, fish fillets, and cured meats in clean, single-stroke cuts. At 240mm it is the ideal length for portioning at the pass or preparing sashimi-grade fish at home.

Care & Maintenance

• Hand wash only - never dishwasher
• Dry immediately after use
• Hone regularly with a ceramic or fine honing rod to maintain the edge
• Sharpen with a whetstone to restore the edge
• Do not cut frozen food or bones - the edge may chip
• Store on a magnetic strip or in a knife block to protect the edge