Click to enlargeEXTREMA RATIO T4000 S

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The Extrema Ratio Fulcrum T4000 S is a larger version of the T4000 C. (The T4000 C is a compact knife that is classified as a back-up/boot knife.) The T4000 S is a full-sized, multipurpose, fixed blade. You immediately see the strong Japanese influence in the profile of the blade. The Japanese Tanto shaped blade is designed with Extrema Ratio's attention to detail. Gets attention. Distinctive.


Sharp right out of the box. Ready to go! The full tang extends past the end of the handle and forms a lanyard hole. Simple but elegant shape.


Made of Forprene with a “rubbery” grip that allows you a good hold even with wet hands. Has the Extreme Ratio distinctive handle design. Lacks guards to allow you to use thumb/finger pressure on the spine for extra control and strength.


The T4000 S is carried in a Cordura sheath. You can remove the belt loop section. Well made. Heavy-duty. MOLLE compatible.


This is a modern version of a classical Japanese Tanto style blade. For collectors who appreciate this distinctive blade shape but want a “contemporary” knife.

Length of Knife (including lanyard hole): mm 304.80 (12.00 inches)

Blade Length (from handle to tip): mm 174.75 (6.88 inches)

Blade Length (sharpened area only): mm 158.75 (6.25 inches)

Total Length of Knife and Sheath (includes belt loop): mm 406.40 (16.00 inches)

Handle Length (not including lanyard hole): mm 120.65 (4.75 inches)

Weight of Knife: g 266.49 (9.40 ounces)

Weight of Knife and Sheath: g 391.22 (13.80 ounces)

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

Blade Width (widest section): mm 35.31 (1.39 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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