Jake Hoback Knives OSF Stonewash Folding Knife Titanium Handle Steel Blade


The OSF3.5 has been one of those knives that has always had a huge following. OSF stands for "Open Source Folder."

As Jake says, "When I started this project in 2010, it was after I had spent countless hours researching folding knives, mechanisms and lock geometry. I thought to myself, why not put this information into a solid model so that everyone who is getting into making folders can start with a finished idea to look at while they build their very own awesome knife. So I set out to make the knife in such a way that it could be made with simple tools, no CNC necessary. All you would need to do is waterjet cut a blank and start drilling and tapping."

The knife design itself is a modified sheep’s foot blade with a properly engineered frame set. The single point rear standoff/backspacer is large enough to handle knife stresses but small enough to allow a rather large handle to blade ratio.

The blade steel is CPM-S35VN, with an excellent heat treat that seamlessly flows into and out of the titanium frame set. There are several options to choose from to make this knife your very own -- including pocket clips, pivots, backspacers, and inlays. This all adds up to a NPD (Never Put it Down), not just an EDC!


Blade: .1875 Thick, CPM-S35VN Stainless Steel

Frame: .1875 Titanium

Overall Length: 8.75”
Blade Length: 3.5”
Closed Length: 5.125”
Carry Option: Tip Up Right/Left-Handed
Weight: 6.4oz

Other Features:

  1. Pivot Thrust Bearings
  2. HRD (Hoback Roller Detent)
  3. Hardened Stainless Steel Lock Insert With Over travel Prevention
  4. Engineered Internal Lightening Pockets
  5. Standard Sizes On All Screws For Ease Of Replacement
  6. Hardened Stainless Steel Bearing Races