Born out of the growing demand of demanding professionals, Extrema Ratio presents ONTOS - a field knife designed to meet any challenge. The name, derived from the Greek “the thing,” represents the perfect synthesis of toughness, versatility and reliability. Compact yet extremely durable, ONTOS is the ideal companion in any situation, thanks to its partially serrated blade that always ensures a sharp, ready-to-use cut.

Its nylon thigh scabbard, equipped with the MOLLE system, is designed to stay firmly anchored even in the harshest conditions, when the soldier is forced to give up his primary tactical equipment. And for those seeking an extra level of preparedness, a survival kit, purchased separately, is available to attach directly to the knife sheath.

Intended Use: Heavy Utility
Production Type: Industrial
Country of manufacture: Italy
Blade: N690Co 58HRC stainless steel
Surface treatment: Burnishing MIL-C-13924
Handle: Forprene
Blade length: 168mm.
Blade thickness: 6.3mm.
Total length: 299mm.
Balance: advanced
Weight: 411g.
Sheath: nylon, MOLLE compatible
Packaging: cardboard box with Extrema Ratio logos
Notes: -

Profilo Aziendale

Extrema Ratio è un'azienda specializzata nella progettazione e produzione di coltelleria professionale per uso militare, pubblico e soccorso. La produzione si colloca nella fascia medio-alta, con un focus su attrezzature funzionali, durevoli e di alta qualità a costi competitivi per le amministrazioni pubbliche e clienti istituzionali.

I processi produttivi combinano tecniche industriali per garantire efficienza e scalabilità con lavorazioni artigianali che assicurano qualità e affidabilità, come le affilature manuali. L’azienda vanta un’esperienza consolidata grazie alla collaborazione con le Forze Armate italiane e internazionali, che ha permesso di sviluppare prodotti altamente specializzati.

Extrema Ratio si distingue per l'adozione dei migliori materiali, trattamenti innovativi e test interni di resistenza. Collabora con le Università di Perugia e Firenze per l'ergonomia e la qualità tecnica dei suoi prodotti. È certificata ISO 9001 e fornisce le Forze Armate italiane e francesi, nonché altre unità militari e di pubblica sicurezza internazionali.

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Company Profile

Extrema Ratio specializes in the design and production of professional knives for military, law enforcement, and rescue use. The company operates in the mid-high market segment, focusing on functional, durable, and high-quality equipment at competitive prices for public administrations and institutional clients.

The production process combines industrial techniques for efficiency and scalability with handcrafted processes that ensure quality and reliability, such as manual sharpening. The company has extensive experience, built through collaborations with both Italian and international Armed Forces, which has led to the development of highly specialized products.

Extrema Ratio stands out for using the best materials, innovative treatments, and conducting in-house resistance tests. The company collaborates with the University of Perugia for ergonomic design and the University of Florence for technical quality. It is ISO 9001 certified and supplies the Italian and French Armed Forces, as well as various international military and law enforcement units.