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The Extrema Ratio T4000 C is a very robust compact. This knife displays a strong Japanese influence. It is well-made with an attention to detail. Has good balance. Great backup knife. Extrema Ratio has taken the Japanese Tanto style and fashioned it into a modern EDC. The T4000 C has a simple, but elegant shape.


The T4000 C blade is very sharp. This blade shape is good for precise cutting. Has been used successfully for field activities such as making “feathers” and light batoning. The T4000 C has a full tang that extends beyond the handle end to form a lanyard hole.


Forprene is used to make the handle and has a “rubbery” feel. Performs well with wet hands. The T4000 C has the Extrema Ratio distinctive handle design that assures a good grip. No guards so you can apply thumb/finger pressure along the spine when needed.


The T4000 C has a well-made, heavy-duty Cordura sheath. This is a light sheath and you will find it comfortable. It is versatile since it is MOLLE compatible as well as suited for your belt.


The Extrema Ratio T4000 C is an unusual knife that is a modern version of the traditional Japanese Tanto style. A good all around knife suitable for your EDC. Very tough. Very distinctive.

Length of Knife (not including lanyard hole): mm 208.28 (8.20 inches)

Blade Length (from handle to tip): mm 104.14 (4.10 inches)

Blade Length (sharpened area only): mm 88.90 (3.50 inches)

Total Length of Knife and Sheath: mm 222.25 (8.75 inches)

Handle Length (not including lanyard hole): mm 99.06 (3.90 inches)

Weight of Knife: g 195.61 (6.90 ounces)

Weight of Knife and Sheath: g 277.83 (9.80 ounces)

Blade Thickness (widest part): mm 4.0 (0.16 inches)

Blade Width (widest section): mm 35.05 (1.38 inches)

Blade Steel: Bohler N690 cobalt stainless steel*

Blade Hardness: Rockwell 58 HRC

Grinding: Flat grind

Serrations on Blade: No

Lanyard Hole: Yes

Handle Material: Forprene**

Sheath Material: Heavy duty Cordura

MOLLE Compatible Sheath: Yes


* The blade is made with N690 cobalt stainless steel; a high performance steel with excellent cutting and sharpening characteristics. This steel is also used in the butchering industry and to make surgical instruments.

** Forprene (NATO Mil-Spec elastomer) has extreme temperature and moisture resistance.

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