Viper Knives Vox Fortis Flipper Knife Carbon Fiber (3.5" Satin) V5950FC

MSRP: $335.97
Our Price: $244.95
Online Only
In Stock!
Add to Wishlist
Item #BHQ-49483


  • Overall Length:8.25"
  • Blade Length:3.50"
  • Blade Thickness:0.16"
  • Blade Material:Bohler M390
  • Hardness:60-61 RC
  • Blade Style:Drop Point
  • Blade Grind:Flat
  • Finish:Satin
  • Edge Type:Plain
  • Handle Length:4.75"
  • Handle Thickness:0.44"
  • Handle Material:Carbon Fiber
  • Color:Black
  • Weight:3.99 oz.
  • User:Right Hand
  • Pocket Clip:Tip-Up
  • Knife Type:Manual
  • Opener:Flipper, Thumb Hole
  • Lock Type:Frame Lock
  • Brand:Viper
  • Model:Fortis
  • Model Number:V5950FC
  • Designer:Jesper Voxnaes
  • Country of Origin:Italy
  • Best Use:Everyday Carry
  • Product Type:Knife


This Fortis model features a Bohler M390 steel blade with a satin finish and a titanium frame lock handle with a carbon fiber front scale. It sports a blue anodized pocket clip and back spacer.

The Fortis is the result of another successful collaboration between Viper and custom knifemaker Jesper Voxnaes. Its slender titanium frame lock handle is contoured for a natural feeling grip that offers added security and comfort during use. Cutting performance is top notch thanks to a Bohler M390 steel blade with a practical profile and flat grind. A flipper opener, thrust bearing pivot, sturdy frame lock, and machined titanium pocket clip combine to create an exceptional EDC folder.

  • M390 blade steel offers high durability and edge retention.
  • Lightweight build and slim design for easy everyday carry.
  • Thrust bearing pivot provides smooth, responsive blade deployment.

Customer Reviews

Write a review for this item
Very nice!
Matthew H.
This knife is really beautiful and uses quality materials. M390 blade steel is fantastic, and the blue-gray titanium spacer and clip make for a nice contrast with the carbon fiber and stonewashed titanium scales. The action broke in fairly quickly, and while it's not a complete "free dropper", it's close. I am sure it would become so if I opened it up and re-lubed the bearings.

The only quibble I have with this knife is that the lockbar is extremely stiff. I suspect this was a change that Viper made to partially address the complaints that the detent was too light, leading to the knife only partially opening when the flipper was engaged. I do feel like it mostly solved that problem (if I work at it, I can still get it to only partially open on flip, but it's not likely to be an issue using the knife normally), but at the expense of making the knife a lot less comfortable to use.

I really like this knife, and I will be keeping it. I think the beautiful design and the premium materials outweigh the minor flaw with the lockbar stiffness, and I'm hoping that it will loosen up a bit with use.
Awesome knife!!
Ronnie J.
I bought two of these and love them. So smooth and silky and the carbon fiber is flawless. My last 3 Vipers have been CF and flawless so
Viper has fixed the shoddy CF problem of the past. Can't wait until bladehq gets more because I am buying a third CF fortis for sure!!!!