Ontos Black - Survival Knife - Extrema Ratio

Extrema Ratio

311,67 €

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Extrema Ratio

Italian company created in 1997, Extrema Ratio evokes for many, the "Rolls Royce" of cutlery, and has become for the operational units and the connoisseurs of the whole world, synonymous with excellence in the field of tactical knives, these being the very best in terms of strength and endurance.

If you have to choose just one knife, whether for military and tactical use or for survival, choose an Extrema Ratio Knife!

More info

The Extrema Ratio ONTOS will never leave you indifferent, it is a powerful knife that will keep all its promises even in the most critical situations.

Having the Extrema Ratio ONTOS survival knife in hand means feeling safe because it is impressive: massive and solid, it remains nevertheless very balanced.

Growing demand from the professionals amongst our clients persuaded Extrema Ratio to design a survival tool for all seasons.

ONTOS (“the thing” in Greek) is a pure field knife, tough and heavyweight despite its compact size. The serrated segment on the back of the blade is meant as a back-up, never to be caught without a sharp edge ready for use.

The MOLLE compatible nylon thigh sheath stays on even in the event of a retreat, when a soldier would drop most of his cumbersome primary equipment.

It is possible to buy separately a survival kit to be fixed to knife sheath.

Available sheaths versions: ONTOS BLACK, ONTOS GREEN.


  • Weight: 411 gr
  • Blade Length: 168mm
  • Total Length: 299mm
  • Blade Thickness: 6,3mm
  • Steel: BöHLER N690 STEEL (58HRC)
  • Material Finish: MIL-C-13924 BURNISHING
  • Grind: Flat 
  • Serration: 40mm
  • Handle: Forprene



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Ontos Black - Survival Knife - Extrema Ratio

Ontos Black - Survival Knife - Extrema Ratio