Masahiro Virgin Carbon 9.5-inch (240mm) Gyuto

The Masahiro Virgin Carbon 240mm Gyuto (MH13012) is a specialized instrument for chefs who prioritize mechanical efficiency over stainless convenience. Unlike standard 50/50 bevels found in mass-market knives, this blade features a dedicated right-handed asymmetrical grind. By biasing the edge geometry approximately 80/20, Masahiro engineers a knife that tracks perfectly straight through dense produce—like butternut squash or large cabbages—negating the natural outward 'pull' common in symmetrical blades.


The 240mm (9.5-inch) length provides the essential pivot point for rocking motions and the necessary reach for slicing large proteins in a single stroke. At the core is Masahiro's 'Virgin Carbon' steel, a high-purity alloy intentionally crafted without large chromium carbides. This results in a remarkably fine grain structure. During testing, this steel exhibits a 'toothy' bite that holds its edge through an entire double shift and responds with immediate aggression to a fine-grit whetstone or ceramic rod.


Hand-handling reveals a forward-weighted balance, placing the center of gravity where the blade meets the bolster. This assists in push-cutting, allowing the weight of the 240mm blade to do the work. The handle, constructed from resin-impregnated Stamina Wood, provides the tactile warmth of natural wood with the moisture resistance required for a commercial dish pit environment. Note that this is a reactive carbon steel tool; it will develop a unique blue-grey patina with use. This oxidation is a protective layer, sealing the steel and signifying a professional-grade carbon instrument.


SKU: MH13012

Availability: In stock

$132.50
  • Details

    Product Specs & Technical Highlights
    • Primary SKU: MH13012 (Right-Handed Model)
    • Steel Composition: Proprietary Virgin Carbon Steel (Monosteel construction)
    • Rockwell Hardness: 61 HRC
    • Blade Length: 240mm (9.45 inches)
    • Spine Thickness: 2.1mm at base, tapering to tip
    • Edge Geometry: Asymmetrical Grind (Approx. 80/20 Right-Handed bias)
    • Handle Material: Black Stamina Wood (Resin-compressed wood/Polycarbonate)
    • Construction: Full Tang, Triple Riveted
    • Manufacturing Origin: Seki, Gifu Prefecture, Japan
    • Weight Class: Professional Heavy-Duty (Forward-weighted)

    Specialized Maintenance & Care

    • Carbon Reactivity: This blade is NOT stainless. It will rust if left wet. It must be wiped dry immediately after every use, especially when cutting acidic foods like citrus or onions.
    • Patina Development: Expect the blade to change color from bright silver to a dull grey or blue. This is normal and desired for carbon steel enthusiasts.
    • Sharpening Protocol: Because of the 80/20 asymmetrical grind, sharpen the right side (the side facing out when held) at a shallow angle and the left side (facing the body) more vertically to maintain the factory geometry.
    • Storage: Apply a thin layer of food-grade mineral oil or Tsubaki oil if the knife will be stored for more than 48 hours without use.

    Professional Application

    • Best For: Heavy-volume vegetable prep (Mirepoix, slaw, dicing root vegetables) and precision slicing of raw meats.
    • Not Recommended For: Cutting through frozen foods, bones, or hard rinds (cheese rinds, pits), as the 61 HRC steel is brittle and prone to chipping under lateral stress.

     

    When We Recommend the Masahiro Virgin Carbon Series

    Who it Fits Best

    This is for the career line cook or the 'Carbon-Head' enthusiast who finds stainless steel blades 'soulless'. It is built for right-handed users who have mastered their sharpening stones.

    Where it Excels

    It is a beast for heavy vegetable prep—onions, celery, and peppers—where the edge stays biting long after other knives have dulled. It also excels at clean slicing of raw proteins.

    Professional Comparisons

    It is significantly harder and holds an edge longer than a Victorinox or Wusthof, but it is more brittle. Compared to a Global, it has much better weight and handle ergonomics for long-term use.

    Chef Feedback

    "Pro chefs love the 'Masahiro feel.' It’s a no-frills tool. The handle is nearly indestructible in a commercial environment, and the steel responds beautifully to a leather strop."

    Trade-offs & Considerations

    Carbon steel takes a little more care than stainless, it requires the discipline to wipe the blade dry every single time it touches water or acidic food.

    Additional Info

    Blade Length (Inches) 9.4 in.
    Blade Length (mm) 240 mm
    Blade Width (inches) 2
    Grind Asymmetrical/Compound
    Steel Type Virgin Carbon
    Rockwell Hardness 61
    Stainless No
    Handle Material Stamina Wood (Black Dyed Pressed Wood in Polycarbonate)
    Spine Thickness (mm) 2.1
    Brand Masahiro
    Country of Manufacture Japan
    SKU MH13012
    Manufacturer's Part Number 13012
    Manufacturer's Suggested Retail Price $199.95

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