Extrema Ratio

Extrema Ratio è un marchio italiano di coltelli tattici, fondato nel 1997. L'azienda sviluppa coltelli per uso militare, di polizia, di soccorso e per attività outdoor. Extrema Ratio è fornitore ufficiale delle forze armate e di sicurezza italiane, è certificata ISO 9001 e possiede il codice fornitore NATO.

Puoi acquistare coltelli Extrema Ratio originali su MyGoodKnife: il nostro negozio è rivenditore ufficiale del marchio. La nostra selezione comprende coltelli tattici pieghevoli e coltelli a lama fissa delle serie più popolari di Extrema Ratio: Col Moschin, Fulcrum, RAO, Caimano Nero, Dobermann, Selvans, Misericordia, S-THIL e altre.

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Folding knife Extrema Ratio MF1 Evo D Black Satin M390 0410000232M3SATB 9.5cm
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Coltello da tasca Extrema Ratio MF1 Evo D Black Satin M390 9.5cm 0410000232M3SATB
This version of the Extrema ratio MF1 Evo D folding knife has a satin blade made of Bohler M390 steel and a black handle. The handle consists of two anodized aluminum plates. Double-sided steel clip. The LINER-LOCK blade locking mechanism is supported by the new generation "HIDDEN LOCK" safety system. Extrema Ratio MF1 Evo D Black weighs 185 g.
247,01 €

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Folding knife Extrema Ratio MF1 Evo SP Tactical Mud 0410000233BLKTM 9.5cm
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Coltello da tasca Extrema Ratio MF1 Evo SP Tactical Mud 9.5cm 0410000233BLKTM
MF1 EVO SP Tactical Mud has a tactical mud handle and burnished Böhler N690 steel (58HRC). Spear Point blade. MF1 Evo is the evolution of Extrema Ratio MF1 knives series. The blade locking mechanism is the LINER-LOCK, supported by a new generation safety system “HIDDEN LOCK”. MF1 EVO SP Tactical Mud weights 187 g.  The handle is composed of two finely machined anodized aluminum scales.
223,11 €

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Folding knife Extrema Ratio MF1 Evo D Red Satin M390 0410000232M3SATR 9.5cm
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Coltello da tasca Extrema Ratio MF1 Evo D Red Satin M390 9.5cm 0410000232M3SATR
MF1 Evo is the evolution of Extrema Ratio MF1 knives series. This version of folding knife has a satin blade made ob Bohler M390 steel and red handle. Extrema Ratio MF1 Evo D Red weights 185 g.  The handle is composed of two finely machined anodized aluminum scales. The reversible steel clip allows to conceal the knife inside the pocket, making the knife invisible from the outside. The grip is equipped with a hard metal rear glass-breaker. The blade locking mechanism of the Extrema Ratio MF1 Evo D Re is the LINER-LOCK, supported by a new generation safety system “HIDDEN LOCK”.
247,01 €

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Folding knife Extrema Ratio LKU01 Luce 04.1000.0243M3SATC 10cm
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Coltello da tasca Extrema Ratio LKU01 Luce 10cm 04.1000.0243M3SATC
Extrema Ratio LKU01 Luce is a new, limited-edition version (only 100 pieces) of the popular LKU01 EDC knife. The blade features a satin finish and is made of Böhler M390 steel. The handle scales are crafted from carbon fiber, a material known for its high mechanical strength and vibration-absorbing properties, making the grip more comfortable to use. The Extrema Ratio LKU01 Luce weighs 109 g. Its stainless steel pocket clip is removable and ambidextrous. The clip is shaped like a horseshoe, paying tribute to Italian fighters of the 1800s and 1900s who used this symbol. The LKU01 Luce comes in an elegant black box that includes a carbon fiber card signed by master bladesmith Danilo Rossi Lajolo di Cossano. The card has rounded corners, but its lower edge is sharpened, allowing it to be used for defensive purposes if necessary. You are advised to check your local laws to ensure that the use, carrying, and transportation of this tool are permitted in your country.
310,76 €

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Folding knife Extrema Ratio Caimano Nero 04.1000.0229/BLK 9.3cm
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Coltello da tasca Extrema Ratio Caimano Nero 9.3cm 0410000169BLK
The Caimano Nero is a tactical knife delivered to the G.O.I., Gruppo Operativo Incursori (Operational Raiders Group) of the Italian Navy, and designed by Extrema Ratio, official COMSUBIN supplier. Its name is a reference and a tribute to the heroic Caimani Neri del Piave (Black Caimans of the Piave river), a unit of the Arditi della Regia Marina (Italian Royal Navy), who used to swim across the Piave river to carry out raids on enemy territory during the First World War. It is an automatic knife with a 4 mm asymmetrical spearpoint blade and a partial sharp false edge to improve the coefficient of penetration. The serrated part of the edge allow to cut highly-resistent cables and fabrics without losing its sharpening. It is a medium folder with a robust structure. It is light and balanced thanks to numerous removal processes applied to its highly-thick aluminum handle scales. The pommel, which recalls the shape of the tail/propel section of the Siluro a lenta corsa (S.L.C.), is designed to improve a rapid extraction of the knife from the pocket. The DLC-coated titanium clip can be positioned in three different angles on both sides to allow maximum customization while wearing it. Its shape is designed to conceal the handle sticking out of the pocket. The automatic blade release system guarantees a complete opening even in the event of accidental impacts during the opening rotation. Among its features, it is equipped with an hard-metal glass breaker and a lock, which prevents the blade from dangerously closing by accident.
338,65 €

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Tactical knife Extrema Ratio Defender 2 DG Stone washed 0410000489SW 11.8cm
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Coltello Fisso Extrema Ratio Defender 2 DG Stone washed 11.8cm 0410000489SW
Extrema Ratio Defender 2 DG is the combat version of Scout knife with ultra slim shape. This 118 mm blade comes with a blood drain which makes it lighter. This is DG - double guard version. Defender comes with black kydex sheath fitting the M.O.L.L.E. system.
188,05 €

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Tactical knife Extrema Ratio Defender 2 DG Black 0410000489BLK 11.8cm
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Coltello Fisso Extrema Ratio Defender 2 DG Black 11.8cm 0410000489BLK
Extrema Ratio Black Defender 2 DG is the combat version of Scout knife with ultra slim shape. This 118 mm blade comes with a blood drain which makes it lighter. This is DG - double guard version. Defender comes with black kydex sheath fitting the M.O.L.L.E. system.
208,76 €

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Tactical knife Extrema Ratio Fulcrum Bayonet Ranger Black
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Coltello Fisso Extrema Ratio Fulcrum Bayonet Ranger Black 18cm 0410000301RANGER
 Like the original FULCRUM, this Tactical knife Extrema Ratio Fulcrum Bayonet Ranger Black is extremely versatile and strong, capable of sustaining loads of over 150 kilograms. The tanto-shaped blade allows for large amounts of work and wear while still keeping a sharp edge at its exceedingly sturdy tip. This feature, combined with a sharp false edge (in the military versions only), makes the knife retain sufficient combat penetration capability to engage targets covered in heavy clothing, paddings or soft ballistic protections. Thanks to its weight and top-heavy balancing, the FULCRUM BAYONET blade is suitable for hard work on the field.
FULCRUM BAYONET RANGER is the version supplied to the Italian Alpine Paratroopers, with gears and hilt guard for the M4/M16 rifle and wire cutting system, black handle, black rigid sheath, softshell cordura Camo Italia case.
388,71 €

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Tactical knife Extrema Ratio A.M.F. Black
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Coltello Fisso Extrema Ratio A.M.F. Black 20.6cm 04.1000.0485BLK
Extrema Ratio A.M.F. (Advanced Multi Function) Black is a 20,6 cm blade knife inspired to a legend in the survival cutlery of the 80es. It can be easily disassembled. Comes with cordura sheath fitting the M.O.L.L.E. system. A survival kit (to be bought only on request) can be easily fixed to the cordura sheath. A.M.F. comes also in desert version.
335,48 €

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Folding knife Extrema Ratio MF0 T Desert Warfare 0410000148DW 6.8cm
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Coltello da tasca Extrema Ratio MF0 T Desert Warfare 6.8cm 0410000148DW
Extrema Ratio MF0 T Desert Warfare folding knife is equipped with a 7 cm tanto blade.  Extrema Ratio MF0 is a multifunctional folding knife, which is the lightest model in the MF (Medium Folder) line. The knife retains all the characteristics of the MF1, being in fact a smaller version of it. The knife blade is made of Austrian alloy steel Böhler N690 (58 HRC), traditional for Extrema Ratio.
262,93 €

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Dagger Extrema Ratio Adra Ordinanza 17 Stormo 17.8cm
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Coltello Fisso Extrema Ratio Adra Ordinanza 17 Stormo 17.8cm
Extrema Ratio Adra Ordinanza 17 Stormo dagger with black oxide-coated blade 178 mm (7 in) and 17th Stormo logo, serrated partly. 
The “Arditi Distruttori della Regia Aeronautica” (lit. royal air force brave destroyers) were an Italian battalion serving in the North African theater during WW2, and awarded two silver medals of honor.
This ADRA dagger, with its classic European shape, was designed for and with strong input from the commanders and operatives of the 17th. Comes in in ABS engraved case with an ankle sheath and a sand-color parade belt sheath. Total length 311 mm (12.2 in). Weight 331 g (11.7 oz) 
502,42 €

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Folding knife Extrema Ratio BD4 Adra Contractor 041000498TM 12.3cm
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Coltello da tasca Extrema Ratio BD4 Adra Contractor 12.3cm 041000498TM
Extrema Ratio BD4 Adra Contactor is available in a limited edition of 70 pieces. It comes inside a certified IP67 waterproof polypropylene technical case with pressurization valve resistant to atmospheric agents, dust and shocks; this includes a scroll outlining the past and present of the 17th Stormo Incursori of the Italian Air Force and a metal plate bearing the progressive number within the limited series.
276,48 €

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Folding knife Extrema Ratio T-Razor Black 04.1000.0138/BLK 10cm - 4
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Coltello da tasca Extrema Ratio T-Razor Black 10cm 0410000138BLK
Extrema Ratio T-Razor with black coating. Up to the early 1900s, people commonly carried pocket utility knives. Due to rampant “misuse”, though, laws were passed to the effect that all such knives were to be clipped at the blade-tip, in order to diminish their dangerousness as weapons. Some people then figured they’d get the greatest effectiveness out of the sharp edge of a traditionally flat-point blade shape, and took to carrying straight-razors. Thus, the straight-razor was for a time regarded as a fearsome weapon of self-defense. Such a “misuse” of the common straight-razor inspired our T-RAZOR design. Available versions: T-RAZOR BLACK, T-RAZOR SATIN.
208,06 €

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Pugnale Extrema Ratio Suppressor Operativo 0410000312BLK 17.6cm
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Coltello Fisso Extrema Ratio Suppressor Operativo 17.6cm 0410000312BLK
Suppressor Operativo dagger from Extrema Ratio is the memorial dagger, issued to commemorate the thirtieth anniversary of the unit G.I.S., the renowned counter-terrorism unit of the Carabinieri (Italian military police). Black oxide-coated blade 176 mm (6,9 in), without logo, Böhler N690 steel. Side sheath included. Weight 302 g (10.7 oz)
408,87 €

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Tactical knife Extrema Ratio Misericordia Desert
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Coltello Fisso Extrema Ratio Misericordia Desert 11.8cm 0410000479SWD
It is a fixed-blade knife Extrema Ratio Misericordia Desert meant for those circumstances in which a knife has to be extremely light and compact. Extrema Ratio Misericordia Desert preserves all the characteristics of the famous Misericordia, model adopted by the 4th Alpine Paratrooper Regiment, and is derived from the commemorative dagger made for the 140th anniversary of the 4th Alpine Regiment and the 70th anniversary of the institution of the Alpine Paratroopers. The new desert coloration gives to this model a new tone that best meets the needs of the most modern operative units. The blade is milled in Böhler N690 steel, heat treated to 58 HRC, and is 118 mm (4.64”) long and 4mm (0.16”) thick with a flat grind. The knife weights just 87g (3.1oz). The blade has a spear point profile with a full length fuller that makes it even lighter, and a false double edge for ¾ of its length. The finishing is stone washed. The knife has a polymer grip that flows smoothly into the ring, topped by a skull crusher, that allows the use of martial arts techniques and grants a very solid grip on the knife. It has the classic Extrema Ratio groove near the front allowing a better grip and it is secured to the tang by a screw. The knife is secured to the sheath by a fast release safety that can be easily reversed for left hand use. The highly resistant nylon sheath is also in desert and is very versatile; two adjustable loops allow the user to attach it to M.O.L.L.E. systems, allowing fast extraction in a tactical scenario. 
157,76 €

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Folding knife Extrema Ratio Glauca G1 04.1000.0179-TM 11.2cm
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Coltello da tasca Extrema Ratio Glauca G1 11.2cm 0410000179-TM
Glauca G1, a new version of the Glauca Exrema Ratio knife, is designed specifically for the famous GSG9 - a unit of the Italian Federal Police. The Glauca G1 knife is officially included in the police arsenal. The handle is made of tactical colored anodized aluminum. The knife is equipped with a glass breaker and a pocket clip that can be installed in different positions. Additionally, the knife is equipped with an awl and a folding rescue tool. Glauca G1 Exrema Ratio has a Liner lock and an additional safety lock. The Drop Point blade is made of Böhler N690 steel with a black finish.
372,89 €

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Tactical knife Extrema Ratio Fulcrum Bayonet NFG Desert
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Coltello Fisso Extrema Ratio Fulcrum Bayonet NFG Desert SW 18cm 0410000310DW
A versatile and extremely tough knife Extrema Ratio Fulcrum Bayonet NFG Desert SW it is a light version of the standard Fulcrum Bayonet. It comes with wire cutter, stone washed blade, desert handle and desert nylon sheath.  This milestone among multipurpose knives, employed on a large scale in Afghanistan as standard issue equipment of the Italian “Nibbio” mission, originated with a COMALP Alpine Troops Command experimental project for renewing trooper equipment. 
265,32 €

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Coltello da collo Extrema Ratio N.K.2 Black 04.1000.0204/BLK 5cm
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Coltello Fisso Extrema Ratio N.K.2 Black 5cm 04.1000.0204/BLK
N.K.2 is a reduced-size knife that enlargesis the family of neck knives by Extrema Ratio. The main differences from the predecessor N.K.1 are the tanto blade and the blood-draining slot. The design of the handle prevents accidental injury while drawing. A groove on the back of the blade accommodates for the user’s index finger or thumb, according to wielding style. Due to its overall construction, the N.K.2 is both capable of offense, through very effective slashing strikes, and useful for minute precision work. The included, rapid- release Kydex sheath comes with a paracord strip for neck carry. Further, it can be attached via MOLLE system to tactical vests or to any of the compatible cordura sheaths from Extrema Ratio.
127,42 €

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Folding knife Extrema Ratio T-Razor Satin 04.1000.0138/SAT 10cm - 1
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Coltello da tasca Extrema Ratio T-Razor Satin 10cm 04.1000.0138/SAT
Extrema Ratio T-Razor folder with satin blade. Up to the early 1900s, people commonly carried pocket utility knives. Due to rampant “misuse”, though, laws were passed to the effect that all such knives were to be clipped at the blade-tip, in order to diminish their dangerousness as weapons. Some people then figured they’d get the greatest effectiveness out of the sharp edge of a traditionally flat-point blade shape, and took to carrying straight-razors. Thus, the straight-razor was for a time regarded as a fearsome weapon of self-defense. Such a “misuse” of the common straight-razor inspired our T-RAZOR design. Available versions: T-RAZOR BLACK, T-RAZOR SATIN.
212,10 €

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Coltello tattico Extrema Ratio Adra Operativa 0410000313BLK-OP 17.8cm
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Coltello Fisso Extrema Ratio Adra Operativa 17.8cm 0410000313BLK-OP
The “Arditi Distruttori della Regia Aeronautica” (lit. royal air force brave destroyers) were an Italian battalion serving in the North African theater during WW2, and awarded two silver medals of honor. They were tasked with complex sabotage operations against enemy airfields, which they accomplished employing then unprecedented guerrilla tactics. Now the 17° Stormo Incursori (17th Raiders Wing) of the Italian Air Force picks up their glorious heritage as a special force. As a tangible token of continuity, members of the 17th line up and parade carrying combat daggers at their belts, as the Arditi used to carry. This ADRA dagger, with its classic European shape, was designed for and with strong input from the commanders and operatives of the 17th. Thus begins its road of honor and duty. ADRA OPERATIVA is the black oxide-coated version, no logo, calf sheath included.
408,87 €

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Coltello tattico Extrema Ratio Suppressor Ordinanza Gis 0410000312BLK-O 17.6cm
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Coltello Fisso Extrema Ratio Suppressor Ordinanza Gis 17.6cm 0410000312BLK-O
Extrema Ratio feels honored and deeply grateful toward the G.I.S., the renowned counter-terrorism unit of the Carabinieri (Italian military police), for requesting of us this memorial dagger, issued to commemorate the thirtieth anniversary of the unit. SUPPRESSOR ORDINANZA GIS is black oxide-coated with G.I.S. logo, exactly as issued to GIS operatives. The blade is made of Böhler N690 steel. The weight of this model 302g.
408,87 €

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Coltello da tasca Extrema Ratio BD2 Contractor Black 04.1000.0229/BLK 9.4cm
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Coltello da tasca Extrema Ratio BD2 Contractor Black 9.4cm 04.1000.0229/BLK
Extrema Ratio BD2 Contractor is a double-edged semi-serrated fully black folding knife with guard. In addition to protecting the users's hands, the guard also acts as a flipper, and the high-speed auxiliary knife opening system makes it easy to use. The BD2 Contractor perfectly combines the functionality of an everyday pocket knife with the elegance of classic Italian style. The streamlined blade is made of Böhler N690 cobalt steel, and the ergonomic handle uses anodized aluminum alloy.
158,06 €

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Tactical knife Extrema Ratio Contact C Black
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Coltello Fisso Extrema Ratio Contact C Black 12.8cm 0410000216BLK
Extrema Ratio Contact C Black has a Böhler N690 steel spearpoint blade, hardened at 58 HRC with single branch handguard and full length fuller for lightness. The Forprene grip is affixed by a threaded tang that makes the knife sturdy and well balanced. The injection molded, impact grade nylon, M.O.L.L.E. compatible scabbard has a dampening system to avoid blade rattle, twin button safety loop and a retention safety disengaged by simple pressure on the trigger-like lever.
203,19 €

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Hunting and Outdoor knife Extrema Ratio Dobermann IV Tactical
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Coltello Fisso Extrema Ratio Dobermann IV Tactical 18.5cm 0410000184BLK
 Extrema Ratio Dobermann IV Tactical knife with a blade length of 18.5 cm. Blade is made of Bohler N690 steel. Weight 336 gr.  Dobermann IV - is updated version of popular Extrema ratio model is suitable for hunting, camping and military use. 
303,55 €

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I coltelli Extrema Ratio fanno parte dell’equipaggiamento di molte unità militari speciali in Italia, nonché della polizia e dei servizi di soccorso. Ogni modello viene sviluppato con grande attenzione e, prima di essere messo in produzione, supera una serie di test rigorosi. L’azienda collabora con l’Università di Perugia, dove gli scienziati conducono studi per valutare l’ergonomia dei prodotti Extrema Ratio e i metodi per migliorarla. Sia i coltelli tattici Extrema Ratio sia i coltelli per uso quotidiano si distinguono per una qualità impeccabile. La maggior parte dei coltelli è realizzata in acciaio austriaco N690. Extrema Ratio utilizza Böhler N690 per la sua affidabilità e prevedibilità. Questo acciaio è noto per l’elevato contenuto di molibdeno e cobalto e per l’alta resistenza alla corrosione. Grazie a queste caratteristiche, l’acciaio N690 offre elevata resistenza e sopporta bene gli urti, aspetto particolarmente importante per l’uso tattico.

Modelli popolari di coltelli Extrema Ratio

I coltelli Extrema Ratio più popolari sono Fulcrum, Col Moschin, RAO, Adra. Extrema Ratio produce inoltre diverse linee di coltelli pieghevoli tattici: BF (basic folder), MF (medium folder), e le serie BD4 e BD2. I modelli pieghevoli possono essere utilizzati anche in ambito urbano.

Domande frequenti sui coltelli Extrema Ratio

Cosa significa Extrema Ratio?

Extrema Ratio significa in latino «misure estreme». Il nome riflette la filosofia del marchio: coltelli progettati per situazioni in cui sono fondamentali la massima affidabilità, il controllo e la preparazione a condizioni estreme.

Dove vengono prodotti i coltelli Extrema Ratio?

I coltelli Extrema Ratio sono interamente prodotti in Italia. L’azienda ha sede a Prato e controlla l’intero processo, dallo sviluppo all’assemblaggio. Il marchio è fornitore ufficiale per le forze militari e le strutture di sicurezza ed è certificato come fornitore NATO.

Quale coltello Extrema Ratio viene utilizzato dai militari?

Uno dei modelli più noti è il Col Moschin, sviluppato per il 9º reggimento paracadutisti d’assalto delle forze speciali italiane. Vengono utilizzati anche modelli come Fulcrum, Requiem e altri coltelli progettati per compiti specifici.

Vale la pena acquistare coltelli Extrema Ratio?

Se hai bisogno di un coltello molto resistente e affidabile per attività tattiche, outdoor o uso intensivo — sì. Extrema Ratio è uno strumento con un elevato margine di resistenza, progettato per l’uso reale. I coltelli Extrema Ratio si distinguono anche per un’altissima qualità costruttiva. Nel corso degli anni di attività del nostro negozio, questo marchio ha il minor numero di reclami da parte dei clienti riguardo alla qualità dei prodotti.

Nel negozio online MyGoodKnife puoi acquistare coltelli Extrema Ratio originali — siamo rivenditori ufficiali del marchio e offriamo solo prodotti autentici con spedizione in tutto il mondo.