Extrema Ratio

Extrema Ratio est une marque italienne de couteaux tactiques, fondée en 1997. L'entreprise conçoit des couteaux pour les militaires, les forces de police, les services de secours et les activités de plein air. Fournisseur officiel des forces armées et des forces de sécurité italiennes, Extrema Ratio est certifiée ISO 9001 et possède un code fournisseur OTAN.

Retrouvez les couteaux Extrema Ratio authentiques chez MyGoodKnife, distributeur officiel de la marque. Notre sélection comprend des couteaux tactiques pliants et des couteaux à lame fixe issus des gammes les plus populaires d'Extrema Ratio : Col Moschin, Fulcrum, RAO, Caimano Nero, Dobermann, Selvans, Misericordia, S-THIL, et bien d'autres.

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Couteau pliant Extrema Ratio MF2 Black Ruvido 11.3cm 04.1000.0142/RVB
L'Extrema Ratio MF2 est un couteau de la série Medium Folders. Selon la classification Extrema Ratio, la série Medium Folders se situe entre les Basic Folders (Light Folders) – couteaux simples, légers et universels – et les Heavy Folders – outils pliants lourds et puissants. L'Extrema Ratio MF2 Black Ruvido est une version avec un manche traité avec un polymère spécial. Ruvido signifie « rugueux » en italien. La lame est en acier Böhler N690 (58HRC). Le poids du couteau Extrema Ratio MF2 Black Ruvido est de 194 g.
307,26 €

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Couteau pliant Extrema Ratio MF0 T Noir 6.8cm 0410000148BLK
L'Extrema Ratio MF0 est un couteau pliant multifonction, le modèle le plus léger de la gamme Extrema Ratio MF (Medium Folder). Il conserve toutes les caractéristiques du MF1, mais reste sa version plus petite. Sa lame de 7 centimètres est fabriquée en acier allié autrichien Böhler N690 (58 HRC), traditionnel pour Extrema Ratio.
233,87 €

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Couteau pliant Extrema Ratio Resolza 10 Stone washed 10cm 04.1000.0168/SW
Extrema Ratio Resolza 10 est un couteau pliant à lame polie, hommage aux traditions italiennes séculaires. Le couteau traditionnel sarde « resolza » est l'un des couteaux italiens les plus célèbres. Aujourd'hui encore, il accompagne les agriculteurs et les bergers de l'île dans leur travail quotidien. Il les accompagnait même lors des mobilisations : pendant la Première Guerre mondiale, il est mentionné dans les chroniques de Sassari comme faisant partie de l'équipement des soldats. Resolza 10 revisite la silhouette traditionnelle selon les standards modernes d'Extrema Ratio, sans négliger les artisans sardes qui perpétuent les traditions ancestrales et pratiquent des méthodes de fabrication de couteaux ancestrales. Resolza 10 conserve les dimensions et les proportions d'origine, mais est fabriqué avec les technologies modernes de l'entreprise et des matériaux de meilleure qualité. Le manche a été redessiné et la lame s'est rapprochée de la forme traditionnelle.
154,84 €

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Couteau pliant Extrema Ratio BD4 R Satin 12.2cm 0410000496SAT
L'Extrema Ratio BD4 R est un couteau pliant basique doté d'une lame satinée. Son système d'ouverture auxiliaire ultra-rapide facilite son utilisation. Le BD4 R allie parfaitement l'élégance du style italien classique à la fonctionnalité d'un couteau pliant EDC. Sa lame est en acier autrichien Böhler N690 et son manche ergonomique est en aluminium anodisé.
142,74 €

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Couteau à lame fix Extrema Ratio MK2.1 Black 17.7cm 04.1000.0128/BLK
Extrema Ratio MK2.1 is a re-issue of the Mark 2 combat dagger, one of the most common knives during World War II. The aim was to preserve the characteristic properties of the original, making only those changes that would increase its effectiveness. The blade is made of Böhler N690 cobalt steel, the rest of the parts are made of AISI 303 and AISI 304, and the handle uses fiberglass-reinforced nylon instead of leather. The MK2.1 retains the ergonomics of the original Mark 2, while all of the frame parts have been enlarged to provide a robust, high-performance multi-tool. The most significant changes are aimed at eliminating the known "weak points" of the original knife: the ability to disassemble in the field without the tools, a straightened modified Bowie profile, which makes it easier to maintain the edge, and recesses on the handle that help to correctly orient the blade in the dark and increase the grip during rotational movements. Lanyard hole and front guard holes have also been added. The kit includes a standard hip-mount sheath.
325,81 €

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Training knife Extrema Ratio TK S 2 GOI 14.2cm 04.1000.0316-TK
Training knife Extrema Ratio TK S 2 GOI with 142 mm blade. Weight 173 g. Training knives enable martial arts practitioners and professionals to train different combat techniques with an appropriate and dedicated tool. All training knives are produced in a metallic blue colour which makes them easily identified even when sheathed. The blades are produced from anodized aluminum and have the very same shape and size of the Extrema Ratio standard production models. The handles are the same used in Extrema Ratio´s production models. The sheaths, sold separately, are the same used for the real knives. The stiff blade allows for training complex defensive and disarming techniques. We recommend the use of appropriate protective gear when training.
54,84 €

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Couteau pliant Extrema Ratio MF0 D Black Rough 6.8cm 04.1000.0140/RVB
Extrema Ratio MF0 D Black Rough folder is “the little one” amongst MF knives. Basically it is a compact version of the MF1. It retains all the characteristics of MF1 but has a downsized handle and shortened blade, similar to our SHRAPNEL “back-up” knife. This versione is produced with a rough handle for a better grip. The drop point blade 68 mm is made of Bohler N690 stainless steel (58HRC). Black aluminum handle. 
MF stands for Medium Folder: a product line positioning itself between the BF (Basic Folder) and the Heavy Folder lines. MF knives employ the LINER-LOCK mechanism and are distinguished for their sturdiness; all are equipped with a glass-breaker. An innovative supplementary screw can be unlocked to enable fine-tuning of the main screw, adjusting opening speed to taste. Hemispheric milling marks on handles make it easier to change from saber-style to reverse grip. Clips are reversible. Overall length 181 mm. Weight 139 g. Made in Italy.
233,87 €

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Couteau de Plongée Extrema Ratio Ultramarine with hole 15cm 04.1000.0320/BLK
Extrema Ratio ULTRAMARINE is an amphibious knife, carried around from underwater operation equipment (diving suit) to ground operation equipment (tactical vest). Can be shipped only inside EU. Two different versatile sheaths were therefore developed for it. The scuba sheath can be worn at the ankle, or its hard ABS section can be attached by two BELT-CLIPS to either the breathing apparatus or BCD belts. The land sheath (OPTIONAL, included on request) is MOLLE system compatible, designed to be attached to the tactical vest and carried inside a waterproof bag during underwater operations. All an operative has to do, if getting rid of his diving suit after landing, is to draw the knife from its ankle sheath and place it in the tactical vest sheath. Primary functions: field operations, underwater operations, emergency tool, survival and combat.
522,58 €

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Training knife Extrema Ratio TK KS 24.1cm 04.1000.0172-TK
Training knife Extrema Ratio kukri KS. Extrema Ratio restyled series of training knives are manufactured in a wide range of models of diverse size and shape. They enable martial arts practitioners and professionals to train different combat techniques with an appropriate and dedicated tool. All training knives are produced in a metallic blue colour which makes them easily identified even when sheathed. The blades are produced from anodized aluminum and have the very same shape and size of the Extrema Ratio standard production models. The handles are the same used in our production models. The sheaths, sold separately, are the same used for the real knives. The stiff blade allows for training complex defensive and disarming techniques. We recommend the use of appropriate protective gear when training.
68,55 €

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Couteau pliant Extrema Ratio Nightmare Black 7.3cm 04.1000.0454/BLK
Extrema Ratio is proud to present the new development of karambit folding knife with rescue characteristics. It has been adopted by the special units of U.S.I.V.P. Principality of Monaco Police. Its name comes from the development and consultancy department of Monaco special intervention units. It comes with a standard industrial-grade cutter blade which is easily replaced, a reversable pocket clip, a glass braker placed in the finger ring. It is produced both in black and stone washed version.
254,03 €

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Couteau à lame fix Extrema Ratio Fulcrum C FH Black 11cm 04.1000.0110/BLK
FULCRUM C is the compact version of the FULCRUM, which it equals in robustness and sturdiness. Its downsized blade (only 4″ 1/3 long) and handle make it comfortable to carry and easily concealed. The included hard sheath can be worn vertically, horizontally or obliquely (at a 45° angle), and sports a single automatic pressure-activated security lock for quick, easier drawing and sheating. This makes the FULCRUM C an intuitive, rapid-use knife, ideally suited to emergencies or self-defense. The original version of the FULCRUM C comes with a 3.93in compact handle, the Full Handle version comes with a more comfortable 5in handle.
209,68 €

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Couteau à lame fix Extrema Ratio Task C Black 11cm 04.1000.0085/BLK
Extrema Ratio Task Compact Black fixed knife in a compact size. The blade 110 mm (4.3 in) made of Böhler N690 steel, black burnishing finish. Handle Forprene with lanyard hole. Knife comes with hard belt sheath and BELT-CLIP. The sheath can be worn vertically, horizontally or obliquely (at a 45° angle). Overall length 214 mm (8.4 in). Weight 205 g (7.2 oz).
183,87 €

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Couteau à lame fix Extrema Ratio Nimbus Operativo 14.1cm 04.1000.0240/BLK-OP
Extrema Ratio Nimbus Operativo is a modern version of the Second World War Italian Nimbus assault knife. The black blade 141 mm (5.55 in) is made of Böhler N690 steel. The black Forprene handle provides a comfortable grip. The total length of the Nimbus Operativo combat knife is 263 mm (10.35 in) Kydex sheath included. Weighs 203 g. (7.16 oz)
270,16 €

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Couteau à lame fix Extrema Ratio Arditi 16.7cm
Extrema Ratio Arditi is a modern version of the First World War Italian Arditi assault knife. The black blade 167 mm (6.57 in) is made of Böhler N690 steel. The sturdy black polymer handle provides a comfortable grip. The total length of the Arditi knife is 270 mm (10.62 in) Cordura sheath included. Weighs 224 g. (7.90 oz)
331,45 €

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Couteau pliant Extrema Ratio MF0 D Desert Warfare 6.8cm 04.1000.0140/DW
MF stands for Medium Folder: a product line positioning itself between the BF (Basic Folder) and the Heavy Folder lines. MF knives employ the LINER-LOCK mechanism and are distinguished for their sturdiness; all are equipped with a glass-breaker. An innovative supplementary screw can be unlocked to enable fine-tuning of the main screw, adjusting opening speed to taste. Hemispheric milling marks on handles make it easier to change from saber-style to reverse grip. Clips are reversible. Model MF0 is “the little one” amongst MF knives – basically a compact version of the MF1. It retains all the characteristics of MF1 but has a downsized handle and shortened blade, similar to our SHRAPNEL “back-up” knife. Available versions: MF0 BLACK, MF0 BLACK RUVIDO, MF0 DESERT WARFARE.
259,67 €

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Couteau pliant Extrema Ratio BF2 R CD Black 9cm 04.1000.0490/BLK
BF2 R are folding knives especially suitable for professional use by military or police operatives. They keep all BF2 characteristics, improved with the new high speed Razor opening system. Available versions: BF2 R Classic Tanto BLACK, BF2 R Classic Tanto STONE WASHED, BF2 R Classic Tanto DESERT, BF2 R Classic Drop BLACK, BF2 R Classic Drop STONE WASHED, BF2 R Classic Drop DESERT.
157,26 €

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Couteau pliant Extrema Ratio BF0 CD SW 5.5cm 04.1000.0460/SW
The new Extrema Ratio BF0 is the smallest among the Basic folders. Its handle produced in technopolymer makes it light and resistant, also thanks to its steel internal frame. The liner lock system enables to open and close it with one hand. It comes with drop blade and stone washed finishing. There are only best folding knives in MyGoodKnife's range.
67,73 €

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Casquette Extrema Ratio Black 04.5100.0132/BLK
Extrema Ratio black baseball cap with embroidered logo (not printed). One size. 
25,96 €
29,84 €

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Couteau pliant Extrema Ratio MF2 Ordinanza 10.7cm
This version of the MF2 was officially acquired by 9° regiment Col Moschin. The knives comes with engraved blade and regiment logo on one side of the handle, the other side shows "INCURSORI" logo.
312,90 €

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Couteau à lame fix Extrema Ratio MK2.1 Desert Warefare 16.9cm 04.1000.0128/DW
The restyling of a classical, a tribute to a veteran, one of the most distributed and used knives during World War II : MARK 2. It was produced in many versions by historical US knives manufacturers but always following the original specs given by the U.S. NAVY. It is the preferred tool among traditionalists who only trust “battle tested" knives. Throughout the years several manufacturers have tried to restyle this knife with little success. It is in fact the original model which is still favoured in the main catalogues. Extrema Ratio’s aim, in this ambitious project, is to keep the original characteristics while developing only functional changes to increase performance. Cobalt reinforced stainless steel is used for the blade, AISI 303 and AISI 304 are used for the other components. The rounded leather handle has been replaced with a fibre glass reinforced nylon handle. The ergonomics of the original knife has been left intact while all structural parts have been oversized to obtain a sturdy versatile knife. The most important changes have been made to solve the so called “weak spots” of the original version. 1.the possibility to disassemble the knife in the field without the need of tools; 2.the Bowie shape was straightened for easy sharpening; 3.the grooves in the “barrel” shaped handle help to find proper blade direction even in dark conditions; 4.the same grooves improve the grip during twisting movements Other small modifications were to add holes on the back tang to add a lanyard and on the front guard to tie the blade on a pole to be used as a spear. For purely estethical reasons the traditional bloodgroove has been “cowardly” replaced with the typical Extrema Ratio “side groove”. The original knife was perfect and no other modifications were needed. The first available versions will be the classic Extrema Ratio Black and the new Desert Warfare which will come with a special HCS coyote sheath specifically developed for SOF units. The black version comes with standard side sheath which includes automatic retention system, protective flap and is M.O.L.L.E. compatible.
358,06 €

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Couteau à lame fix Extrema Ratio Col Moschin Desert Warfare 15cm 04.1000.0125/DW
Commissioned and officially adopted in 2002 by the Ninth Rgt. Incursori "Col. Moschin", this model is the quintessence of a pure combat knife. Inspired by daggers with an asymmetric blade and straight but slightly orientated handle used by the Arditi, in whose footsteps the Col Moschin Regiment follows, it has been re-elaborated in a modern form, endowed with a double edged blade, (single for the civilian version), integral guards and a removable E.R.M.H. handle in Forprene. Both grindings are hollow grind razor sharp. The centre of gravity is towards the end of the handle, the point especially sharp, it is light, manageable and intuitive. Each new Incursore receives one, and each new Incursore is trained to use it in the best way.
341,94 €

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Couteau à lame fix Extrema Ratio Col Moschin Black 15cm 04.1000.0125/BLK
Commissioned and officially adopted in 2002 by the Ninth Rgt. Incursori "Col. Moschin", this model is the quintessence of a pure combat knife. Inspired by daggers with an asymmetric blade and straight but slightly orientated handle used by the Arditi, in whose footsteps the Col Moschin Regiment follows, it has been re-elaborated in a modern form, endowed with a double edged blade, (single for the civilian version), integral guards and a removable E.R.M.H. handle in Forprene. Both grindings are hollow grind razor sharp. The centre of gravity is towards the end of the handle, the point especially sharp, it is light, manageable and intuitive. Each new Incursore receives one, and each new Incursore is trained to use it in the best way.
320,97 €

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Les couteaux Extrema Ratio font partie de l’équipement de nombreuses unités spéciales militaires en Italie, ainsi que de la police et des services de secours. Chaque modèle est développé avec un grand soin et passe une série de tests rigoureux avant d’être lancé en production. L’entreprise collabore avec l’Université de Pérouse, où des chercheurs mènent des études afin d’évaluer l’ergonomie des produits Extrema Ratio et les moyens de les améliorer. Les couteaux tactiques Extrema Ratio comme les couteaux d’usage courant se distinguent par une qualité irréprochable. La plupart des couteaux sont fabriqués en acier autrichien N690. Extrema Ratio utilise l’acier Böhler N690 pour sa fiabilité et sa stabilité. Cet acier est connu pour sa teneur élevée en molybdène et en cobalt et pour sa grande résistance à la corrosion. Grâce à cela, l’acier N690 présente une résistance élevée et supporte bien les chocs, ce qui est particulièrement important pour une utilisation tactique.

Modèles populaires de couteaux Extrema Ratio

Les couteaux Extrema Ratio les plus populaires sont Fulcrum, Col Moschin, RAO, Adra. Extrema Ratio produit également plusieurs gammes de couteaux pliants tactiques : BF (basic folder), MF (medium folder), ainsi que les séries BD4 et BD2. Les modèles pliants peuvent également être utilisés en milieu urbain.

Questions fréquentes sur les couteaux Extrema Ratio


Que signifie Extrema Ratio ?

Extrema Ratio signifie en latin « mesures extrêmes ». Le nom reflète la philosophie de la marque : des couteaux conçus pour des situations où la fiabilité maximale, le contrôle et la préparation aux conditions extrêmes sont essentiels.


Où sont fabriqués les couteaux Extrema Ratio ?

Les couteaux Extrema Ratio sont entièrement fabriqués en Italie. L’entreprise est basée à Prato et contrôle l’ensemble du processus, du développement à l’assemblage. La marque est un fournisseur officiel des forces militaires et des structures de sécurité et possède une certification de fournisseur de l’OTAN.


Quel couteau Extrema Ratio est utilisé par les militaires ?

L’un des modèles les plus connus est le Col Moschin, développé pour le 9e régiment parachutiste d’assaut des forces spéciales italiennes. Les modèles Fulcrum, Requiem et d’autres couteaux conçus pour des missions spécifiques sont également utilisés.


Vaut-il la peine d’acheter un couteau Extrema Ratio ?

Si vous avez besoin d’un couteau extrêmement robuste et fiable pour des tâches tactiques, outdoor ou une utilisation intensive — oui. Extrema Ratio est un outil avec une grande réserve de solidité, conçu pour des conditions réelles. Les couteaux Extrema Ratio se distinguent également par une qualité d’assemblage exceptionnelle. Au fil des années de fonctionnement de notre magasin, cette marque présente le plus faible nombre de réclamations clients concernant la qualité des produits.


Dans la boutique en ligne MyGoodKnife, vous pouvez acheter des couteaux Extrema Ratio originaux — nous sommes un revendeur officiel de la marque et proposons uniquement des produits authentiques avec livraison dans le monde entier.