Extrema Ratio
Extrema Ratio, located in Prato, Italy, has been designing, manufacturing and selling high performance combat ,military, kitchen, hunting and tactical knives since 1997 enjoying a reputation for excellence that is unsurpassed in the military and tactical knife industry.
The increased capacity through the years enabled Extrema Ratio to extend its operations. As part of this effort, the company moved in 2004 to a new 600 square meter facility in order to meet the market demand and the company quickly established itself as one of the country's leading cutlery manufacturers.
Extrema Ratio serves military and law enforcement communities (for kitchen knives, best hunting knives) as well as commercial markets and the knives like are well known and sought after all over the globe.
The company prides itself in design, material and quality to deliver a high end product that meets the most severe mil-standards.
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ExtremaRatio - Bayonet O.D. Green Civile NFG Fulcrum knife - Testudo - knife
After the success of the FULCRUM multirole knife, the civil bayonet version NFG (No Fixing Gears, without rifle attachment) was born. Like the FULCRUM, the bayonet is an extremely robust and versatile knife, the blade withstands breaking loads exceeding 150 kg, the tip is very robust and the profile allows you to work for a long time with the knife without affecting the sharpness of the last section . The advanced center of gravity and the weight of the blade make it suitable for heavy field work.
Intended use: tactical / military / multirole
Blade: N690Co 58HRC stainless steel
Handle: removable, in Forprene
Blade length: 180mm.
Blade thickness: 6.3mm.
Closed Length: -
Total length: 310mm.
Balance: advanced, 1.5 cm from the lower guard branch
Weight: 330g.
Closing: -
Clip: -
Sheath: modular tactical, from thigh or belt, in Nylon and Kydex, with blade attachment system for cutting with wire cutters
Notes: diamond sharpener integrated in the sheath - civil version, without rifle couplingsER-FBN-GR -
ExtremaRatio - Fulcrum Bayonet NFG Black - Knife
After the success of the FULCRUM multi-role knife, the bayonet version was born. Like the FULCRUM, the bayonet is an extremely robust and versatile knife, the blade holds loads at break above 150 kg, the tip is very sturdy and the profile allows it to work for a long time with the knife without affecting the sharpening of the last section , which guarantees, together with the partial dorsal sharpening, to maintain the penetration capacity necessary for hand-to-hand combat against targets covered by heavy clothing, clothing and soft ballistic protections. The advanced center of gravity and the weight of the blade make it suitable for heavy field work. NFG version (No Fixing Gears, without rifle mount).
Intended use: tactical / military / multi-role
Blade: full tang in stainless steel N690Co 58HRC
Handle: removable in Forprene
Blade length: 180mm.
Blade thickness: 6.3mm.
Total length: 310mm.
Balancing: advanced, 1.5 cm from the lower guard branch
Weight: 378g.
Sheath: modular tactile with thread trimmer, thigh or belt, in Nylon and KydexER-FBN-BK -
ExtremaRatio - Fulcrum Bayonet knife NFG Desert SW - knife
Model: Lightened version of the classic Fulcrum Bayonet, with shearder, stone washed blade, desert handle and desert nylon sheath.
Intended use: tactical / military / multi-role
Blade: full tang in stainless steel N690Co 58HRC
Handle: dismountable in Forprene
Blade length: 180mm.
Blade thickness: 6.3mm.
Length closed: -
Total length: 310mm.
Balancing: advanced, 1.5 cm from the lower guard branch
Weight: 378g.
Closure: -
Clip: -
Sheath: modular tactical with shear, thigh or belt, in Nylon and Kydex
Note: -ER-FBN-DE -
ExtremaRatio - A.S.F.K. Italian Army Special Forces Commando - ASFK - knife
The A.S.F.K. is a dagger is dedicated and acquired by the new Italian Army Special Forces Commando (COM.FO.SE). It recalls the tradition of the "Arditi" and bloody battles of the trenches marked by assaults with bayonets. The A.S.F.K. trench knife is a modern twist eith Böhler N690 steel blade, Forprene handles with fingers protection and skull crasher.
Intended use: Tactical / Collection
Type of production: Industrial
Production Country: Italy
Blade: Stainless steel 58HRC N690Co
Treatment blade: Testudo
Handle: Forprene
Blade length: 162mm.
Blade thickness: 6.3mm.
Overall length: 289mm.
Balancing: back
Weight: 413g.
Sheath: Cordura, colored desert, MOLLE compatible
Packaging: cardboard box with logos Extrema Ratio
Notes: Included in command of the Italian Army Special Forces (COM.FO.SE.)ER-ASFK -
Extrema Ratio - Fulcrum Desert Warfare - knife
Intended use: tactical / military / multirole
Blade: full tang stainless steel N690Co 58HRC Desert Warfare
Handle: Removable in Forprene
Blade length: 180mm.
Blade Thickness: 6.3mm.
Closed Length: -
Overall length: 310mm.
Balancing: Advanced, 1.5 cm from the branch of the lower guard
Weight: 325g.
Closed: -
Clip: -
Sheath: modular tactical, from thigh or belt, Nylon and Kydex
Notes: -ER-FUL-DW -
ExtremaRatio - Fulcrum Nibbio - Italian Army - Testudo - knife
Knife distributed in 2000 pieces to the Alpine Body of the Italian Army as part of the "Nibbio" operation in Afghanistan
Target for use: tactical / military / multiruolo
Blade: full tang in stainless steel N690Co 58HRC
Manicure: Removable in Forprene
Blade Length: 180mm.
Blade thickness: 6.3mm.
Closed length: -
Total Length: 310mm.
Balancing: advanced, 1.5 cm from the lower guard branch
Weight: 325g.
Closure: -
Clip: -
Sheath: modular tactical, thigh or belt, in Nylon and Kydex
Notes: -ER-FUL-EI -
ExtremaRatio - A.S.F.K. X Brigatae Anniversarium Limited Edition - ASFK - knife
Extrema Ratio, on the occasion of the 10th anniversary of COM.FO.SE., presents a version in a limited series of only 70 pieces, "A.S.F.K. X BRIGATAE ANNIVERSARIUM LIMITED EDITION".
A.S.F.K. (Assault Special Forces Knife) is the dagger dedicated to and acquired by the Army Special Forces Command. This model recalls the tradition of arditism and the bloody trench battles punctuated by assaults with a bladed weapon. A.S.F.K. is a trench knife reimagined with a modern twist.
A.S.F.K. X BRIGATAE ANNIVERSARIUM LIMITED EDITION comes in an IP67-certified watertight Polypropylene technical case with pressurization valve that is weatherproof, dustproof and shockproof. Inside is a metal plate with the numbering of the series limited to only 70 pieces.
Intended Use: Tactical/Collection
Type of production: Industrial
Country of Production: Italy
Blade: Stainless steel N690Co 58HRC
Blade finish: Burnishing Geotech Camo
Handle: Forprene
Blade Length: 162mm.
Blade thickness: 6.3mm.
Overall length: 289mm.
Balance: backward
Weight: 413g.
Sheath: cordura, M.O.L.L.E. compatible.
Packaging: thermoplastic collectible case with logos
Notes: limited and numbered edition made in only 70 piecesER-ASFKLE -
ExtremaRatio - Ermes - Satin Ordinanza - Collectors Edition - knife
ERMES is the commemorative knife developed in collaboration with the Special Operations Helicopter Regiment (R.E.O.S.) which is part of the Army Aviation Command.
The R.E.O.S. is the operational unit of helicopters in support of special forces composed of personnel specifically trained and equipped to support military activities in any operational context.
The stylized guards of the knife represent the wings present in the heraldic coat of arms of the unit. The steel used is the reliable Bölher N690Co heat treated to 58 HRC. Fiber Reinforced Nylon (FRN) polyamide polymer was chosen for the handle. The hybrid Kydex and fabric sheath is equipped with belt or harness attachment with MOLLE interface system.
It is available in two versions:
"ERMES SATIN ORDINANZA" with satin finish blade and ABS case.
"ERMES BLACK OPERATIVO", with the burnished blade.Intended use: Collection / Tactical
Production type: Industrial
Country of Production: Italy
Blade: Stainless steel N690Co 58HRC
Blade Treatment: Satin finish
Handle: FRN (Fiberglass Reinforced Nylon)
Blade length: 140mm.
Blade thickness: 6.3mm.
Total length: 256mm.
Weight: 229g.
Sheath: Kydex and Fabric with MOLLE type hooking system.
Package: Commemorative case in ABS with the logos of the department
Notes: Commemorative knife developed in collaboration with the Regiment Helicopters for Special Operations (R.E.O.S.)ER-ERM-OR -
ExtremaRatio - Landing Force Titanium - Italian Army troops landing - knife
Knife multirole nonmagnetic, developed and officially acquired by landing troops of the Italian Army. Blade and tang totally titanium make the knife resistant to oxidation and can be used to search for bombs buried all'innesco magnetic (mine probing).
Intended use: Tactical / Amphibian
Type of production: Industrial
Blade Production: Italy
Blade: Titanium Beta 40HRC
Treatment blade: Testudo
Handle: Forprene
Blade length: 180mm.
Blade thickness: 6.3mm.
Length closed: -
Overall length: 310mm.
Thick when closed: -
Balancing: -
Weight: 195g.
Closing: -
Clip: -
Sheath: Nylon desert, with hard shell in ABS; leg straps and attacks M.O.L.L.E.
Packaging: Cardboard box, certificates, manuals
Notes: carbide glass breaker in the rear shank4359