Cu Mai Japanese Knife Blank Blade 5.5 inch Custom Professional Chef Kitchen Tool DIY

Cu Mai Japanese Knife Blank

Cu Mai Ko-bunka Knife Blank Blade – 140mm
Create a distinctive custom kitchen knife with this Cu Mai Ko-bunka knife blank blade, featuring a high carbon steel core surrounded by stainless steel, copper, and brass layers. Designed for knife makers, craftsmen, and DIY enthusiasts, this premium blank combines practical cutting performance with a striking layered appearance.

With a 140mm (5.5 inch) blade length, this blank offers a versatile size for everyday kitchen use. The relatively compact blade is well suited to slicing, chopping, dicing, and preparing vegetables, meat, fish, herbs, and other ingredients. Its Santoku profile makes it an excellent foundation for a custom Japanese-style kitchen knife.

Premium Cu Mai Layered Construction
The most distinctive feature of this blade is its Cu Mai layered construction. The blade uses a high carbon steel core designed to provide the cutting edge, while the core is surrounded by protective and decorative layers of stainless steel, copper, and brass.

The combination of different metals produces a unique visual pattern across the blade. Copper and brass create warm metallic tones that contrast beautifully with the darker areas of the blackened surface. The result is a custom knife blank with a highly distinctive handmade appearance.

The high carbon core reaches approximately 60 HRC, providing a good balance of hardness, edge retention, and practical sharpening characteristics for a kitchen knife.

140 mm Japanese Blade Profile
The 140 mm blade length is one of the most popular sizes for Petty-style kitchen knives. It provides enough cutting surface for everyday food preparation while remaining comfortable and maneuverable.

At 2 mm thickness, the blade maintains a relatively slim profile, making it suitable for makers who want to create a responsive custom kitchen knife with an efficient cutting geometry.

The 55 mm tang length provides a solid foundation for attaching a custom handle. You can pair this blank with a wide variety of handle materials, including stabilized wood, hardwood, micarta, G10, carbon fiber, or other materials used in custom knife making.

Blackened Cu Mai Finish
This blade features a blackened treatment that enhances the contrast of the layered construction and gives the finished blade a dramatic, premium appearance. The darker surface helps emphasize the copper and brass elements within the Cu Mai pattern.

Because Cu Mai blades are individually produced and finished, the pattern and coloration can vary from one blade to another. These natural variations are part of what makes each custom blade unique.

Ideal for Custom Knife Makers
This Ko-bunka knife blank is an excellent choice for creating a handmade Japanese-style kitchen knife. Whether you are an experienced knife maker or working on a DIY knife project, the blank gives you the freedom to choose your own handle design and complete the knife according to your preferred style.

It can be used for custom petty knives, handmade kitchen knives, Japanese-inspired chef knives, knife-making projects, and unique one-of-a-kind creations.

Specifications
Product Type: Ko-bunka knife blank blade
Steel Type: Cu Mai layered construction
Core Material: High carbon steel
Protection Layers: Stainless steel, copper, and brass
Blade Length: 140 mm (5.5 inches)
Blade Thickness: 2 mm
Tang Length: 55 mm
Core Hardness: Approximately 60 HRC
Finish: Blackened treatment
Application: Custom knife making and DIY kitchen knife projects

Please Note About Color and Pattern
Due to lighting conditions, shadows, camera settings, and the specific characteristics of the handcrafted finishing process, the blade colors, tones, and pattern may differ slightly from the pictures shown. Every Cu Mai blade has its own individual character, and these variations are a natural part of the process. Each blade is carefully finished to achieve a beautiful result, making your finished custom knife truly unique.

If you are looking for a 140mm Cu Mai Japanese knife blank that combines a high carbon core, approximately 60 HRC hardness, stainless steel, copper and brass layers, and a distinctive blackened finish, this blade is an excellent foundation for your next custom knife project.

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