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Extrema Ratio BFK Series Folding Knives

Discover the folding side of the Extrema Ratio BFK Series. The full-size BFK and compact BFK Zero bring Extrema Ratio’s precision-built character into a practical everyday format designed to become familiar through regular carry.

Both models feature N690 steel and a fast, fluid Crossbar Lock that operates from either side while keeping your fingers away from the blade’s path during closing. Reversible pocket clips provide fully ambidextrous carry. Explore configurations in Black and Tactical Mud machined aluminum, Green carbon fiber, Avio G10 and Tobacco Micarta.

Choose the size, material and finish that naturally fits your day.

Extrema Ratio BFK Zero Crossbar Lock Avio Blue-Gray G10 Folding N690 Knife 0174SWG6

Extrema Ratio BFK Zero Crossbar Lock Avio Blue-Gray G10 Folding N690 Knife 0174SWG6
Extrema Ratio BFK Zero Crossbar Lock Tactical Mud Aluminum Folding N690 Knife 0174BLKTM

Extrema Ratio BFK Zero Crossbar Lock Tactical Mud Aluminum Folding N690 Knife 0174BLKTM
Extrema Ratio BFK Zero Crossbar Lock Tobacco Brown Micarta Folding N690 Knife 0174SWM2

Extrema Ratio BFK Zero Crossbar Lock Tobacco Brown Micarta Folding N690 Knife 0174SWM2
Extrema Ratio BFK Zero Crossbar Lock Green Carbon Fiber Folding N690 Knife 0174SWF2

Extrema Ratio BFK Zero Crossbar Lock Green Carbon Fiber Folding N690 Knife 0174SWF2
Extrema Ratio BFK Zero Crossbar Lock Black Aluminum Folding N690 Knife 0174BLKBLK

Extrema Ratio BFK Zero Crossbar Lock Black Aluminum Folding N690 Knife 0174BLKBLK
Extrema Ratio BFK Crossbar Lock Tobacco Brown Micarta Folding N690 Knife 0178SWM2

Extrema Ratio BFK Crossbar Lock Tobacco Brown Micarta Folding N690 Knife 0178SWM2
Extrema Ratio BFK Crossbar Lock Green Carbon Fiber Folding N690 Knife 0178SWF2

Extrema Ratio BFK Crossbar Lock Green Carbon Fiber Folding N690 Knife 0178SWF2
Extrema Ratio BFK Crossbar Lock Black Aluminum Folding N690 Knife 0178BLKA1

Extrema Ratio BFK Crossbar Lock Black Aluminum Folding N690 Knife 0178BLKA1
Extrema Ratio BFK Crossbar Lock Avio Blue-Gray G10 Folding N690 Knife 0178SWG6

Extrema Ratio BFK Crossbar Lock Avio Blue-Gray G10 Folding N690 Knife 0178SWG6
Extrema Ratio BFK Crossbar Lock Tactical Mud Aluminum Folding N690 Knife 0178BLKA3

Extrema Ratio BFK Crossbar Lock Tactical Mud Aluminum Folding N690 Knife 0178BLKA3