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ONTOS - from the Greek language – translated as “The Thing”. Ontos was developed to satisfy a call from Extrema Ratio customers who wanted a quality survival knife. Extrema Ratio listened and then created the Ontos. The Ontos is just “the thing” for you to carry when you need a reliable survival knife. The Extrema Ratio Ontos knife is a solid, heavy knife also suited for hunting and camp chores.


The blade has a durable black 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. The section is 1.61 inches long [mm 40.94]. The thick blade is exposed on the spine as it enters the handle and sits slightly above the handle and extends into the top of the handle. This gives you a safe, convenient, thumb pressure area. The sharpened edge ends just before reaching the handle and the blade then continues slightly more to create a thicken area for a lanyard hole. The Extrema Ratio Ontos 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.


The handle on the Ontos is also black. It is made of Forprene and ergonomically designed to give you an excellent grip. Very lightly textured and has a “rubbery” feel to it. Indentations on the handle near the blade provide additional hand control. The Ontos handle is removable as needed for necessary knife maintenance.

SHEATH: This Extrema Ratio Ontos has a MOLLE compatible sheath. It is made of high-quality reinforced nylon. It has a removable belt strap section that snaps on/off if you want to remove it. It also has a leg strap to provide stability.


The survival kit includes an impressive amount of emergency items that are packed in an aluminum box; water bag, nylon cord, button compass, candle, flint & striker, fishing kit, mini multi-tool, matches, sewing kit, purification tablets, single edge razor, signaling mirror, whistle, snare wire, wire saw, pencil, survival instructions. Plus a 12-hour fluorescent stick attached to the side. An Extrema Ratio diamond sharpener is also included.

A nylon case holds the survival kit. This nylon case is attached to your sheath by a MOLLE system or you can carry it separately. Now you are prepared to build a shelter, to start a fire, to get food and water. In an emergency situation, you may be forced to leave your heavy gear behind but the Extrema Ratio Ontos kit goes with you since it can be carried on your belt or a cargo pocket.


The Extrema Ratio Ontos is a very robust, specially-crafted knife. Plus it has a well-equipped kit – a great combination you can depend upon in survival and emergency situations

Total Length: mm 298 (11.73 inches)

Blade Length: mm 165 (6.50 inches)

Knife Weight: g 400 (14.10 ounces)

Total Weight of Knife, Sheath, and Kit: g 1000 (35.27 ounces = 2 pounds 3.27 ounces)

Blade Thickness : mm 6.35 (0.25 inches)

Blade Width (Widest Section): mm 44.77 (1.76 inches)

Blade Steel: Bohler N690 cobalt stainless steel*

Blade Hardness: Rockwell 58 HRC

Grinding: Flat

Serrations: Partial serrations on spine

Handle: Forprene**

Sheath and Kit: Reinforced Nylon

MOLLE Compatible: Both the sheath and the kit are MOLLE compatible

Blade Coating: MIL-C-13924 Black coating


* 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

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Availability: Usually ships in 2-3 business days

127OntosgrADVERTISED PRICE $544.00CLICK TO SEE HOW MUCH YOU SAVE! map price $544.00Please Select Sheath/Kit Color: 
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