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Regular price $353.00 USD
Regular price $432.00 USD Sale price $353.00 USD
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FREE Priority Mail shipping to USA and Military Addresses

**GENEROUS ADDITIONAL DISCOUNT WHEN YOU PAY WITH A US POSTAL MONEY ORDER OR A CHECK** Please email us at or call us at 800-470-9414 or 801-770-4466 for more information. This option is available only for USA customers and not available on our website.

ABOUT THE ONTOS“ONTOS” – translated from Greek as “The Thing”. ONTOS  was developed to satisfy a request from Extrema Ratio customers wanting a quality, roust survival knife. Extrema Ratio listened and then created the ONTOS .  The ONTOS excels when you need a strong knife suited for wilderness survival, hunting and camping.

BLADE: The blade has a durable coating that protects it from corrosion and makes it reflection proof. It has a specially designed serrated section on the upper part of the blade. Has a full tang and it terminates in an extension that provides a generous lanyard hole as well as acting as a window breaker or hammer. It is big, thick, and heavy, giving you the power you need for survival type activities.

HANDLE: The handle on the ONTOS  is made of Forprene and ergonomically designed to give you an excellent grip. Very lightly textured and has a “rubbery” feel to it.

SHEATH: The Extrema Ratio ONTOS  has a MOLLE compatible sheath. It is made of high-quality reinforced nylon. The sheath also has a thigh strap to provide stability.

Length of Knife: mm 299 (11.77 inches)
Blade Length: mm 168 (6.61 inches)
Total Length of Knife and Sheath: mm 318 (12.50 inches)
Weight of knife: g 411 (14.51 ounces)
Weight of Knife and Sheath g 615 (1 pound 5.7 ounces)
Blade Thickness: mm 6.3 (0.25 inches)
Blade Width (Widest Section): mm 44.45 (1.75 inches)
Blade Steel: Bohler N690 cobalt stainless steel*
Blade Hardness: Rockwell 58 HRC
Grinding: Flat
Serrations: Partial serrations on spine
Handle: Forprene**
Handle Length (Excluding Pommel): mm 122.85 (4.84 inches)
Sheath Material: Reinforced Nylon
MOLLE Compatible: Yes
Blade Coating: MIL-C-13924 black coating

Note: individual knives may vary slightly from the above measurements

* 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 has extreme temperature and moisture resistance. Extrema Ratio has tested this material extensively

NOTE: Most Extrema Ratio knives are designed for many purposes except for use with food. While they are known for their versatility, durability and strength, they are not ideal for using with food. For food purposes, it's recommended to use knives specially designed for the task.


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