Click to enlargeEXTREMA RATIO AMF

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The Extrema Ratio A.M.F. (Advanced Multi Function) joins the survival/bushcraft family. Even though it is not a machete, you can use your AMF knife for chopping and batoning. Use it to make feather sticks and for other camp needs. You can easily disassemble it without tools a very desirable feature when you are in the field. An excellent companion for hunting and camping. The AMF knife is a high performance survival/wilderness tool with the excellent quality that Extrema Ratio is known for. A heavy, substantial knife.


Easier maintenance since the AMF can be disassembled without the use of any tools. The sizable AMF blade is designed for strength. Specifically made to handle your heavy tasks. Has a clean edge.


Generous handle. The AMF handle is finely textured to give you a secure grip even with wet or gloved hands. Very heavy double guard so your hand is well protected. Lanyard hole on each side. Plus a single guard near the butt to further stabilize your hand. Has double lanyard holes in it. Butt is capped with a pommel.


The AMF sheath is made of Cordura. It has a one-snap strap going around the handle. Has an attached lanyard. MOLLE compatible plus you can carry it on your belt.

Total Length of Knife: mm 344.93 (13.58 inches)

Blade Length: mm 206.50 (8.13 inches)

Handle Length (between front and back guards): mm 104.90 (4.13 inches)

Total Length of Knife and Sheath: mm 387.35 (15.25 inches)

Weight of Knife: g 485.06 (17.11 ounces)

Weight of Knife and Sheath: g 501.79 (17.70 ounces)

Blade Thickness : mm 6.35 (.25 inches)

Blade Width (Widest Section): mm 37.00 (1.46 inches)

Blade Steel: Bohler N690 cobalt stainless steel*

Blade Hardness: Rockwell 58 HRC

Grinding: Flat grind

Serrations on Blade: No

Handle: Forprene**


* 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.

** The Forprene handle is resistant to extreme temperatures and moisture. It can be disassembled for easier cleaning.

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