The 1 Hour Custom Kydex Knife Sheath – IN YOUR KITCHEN

We’ve all been there… you like the knife but hate the sheath.  Or, you lost a sheath.  Or, you’ve made your own knife that now needs a sheath.  If you are an outdoors man, at some point in your life you are going to have a knife but no sheath.  Without a sheath you can’t really carry the knife which means that you can really use it in the field.  It might as well stay in your kitchen to cut up tomatoes.  What a waste.

If your knife is “sheathless” you pretty much have 4 choices:

  1. Find a sheath from another knife that fits well enough to make due (this never turns out well)
  2. Make a leather sheath yourself (easier said than done – this is a true skill and requires several leather working tools)
  3. Hire someone to make a custom knife sheath (Get ready to pay out some big bucks)
  4. Make your own custom kydex sheath.  (Affordable and fairly simple with no expensive tools)

Option # 4 – MAKE YOUR OWN KYDEX SHEATH – is the subject of this post.

Some of the most expensive knives on the market come with Kydex sheaths – Tom Brown Tracker & Becker BK2 for example.

Becker BK2 Companion Knife

Becker BK2 Companion Knife

Kydex is an extremely durable and functional sheath material.  It also just happens to be very inexpensive and easy to work and mold with simple tools you probably already have at home.  This was the first Kydex sheath I ever made and it took me only about 1 hour.  

Kydex is a thermoplastic material that can be heated up and molded while hot and soft.  Once cooled it retains it’s rigid and almost indestructible texture and properties.  It is extremely popular for knife sheaths and gun holsters.  It is water resistant and is pretty much hassle free.  Bottom line – it’s functional.

Interested in your own Kydex Sheath Build? Read on….

I recently bought a Gerber BIG ROCK camp knife.  It’s a really great fixed blade knife.  I wanted a descent knife to keep in my Bronco and this one fit the bill – and it was only $39.  The only problem – I just didn’t like the sheath.  So, I decided to make a custom sheath using Kydex I ordered from http://www.knifekits.com.

To make a kydex sheath you really only need 7 ingredients:

  • A section of Kydex sheeting
  • Some rivets and rivet punch
  • A Belt fastener (for carrying your knife on a belt)
  • An oven or toaster oven
  • A drill with some bits
  • Hobby saw or Band Saw
  • A foam press for pressure molding the heated/soft kydex around your knife (homemade)

By the way – I’ve seen many people making custom kydex sheaths and holsters for knives, guns, flashlights, etc… on the side for part-time income.  It can be a great hobby for gifts or a side business.  Everyone has their own skill-sets.  You never know, you may become a Kydex Craftsman.

STEP # 1: Get some Kydex and supplies

I ordered everything ala-cart from www.knifekits.com but if I had it to do over again I would have ordered this kit for $10.95: KYDEX KNIFE KIT

It includes the following:

  • (1) 12×12 piece of .060 KYDEX material (cell/smooth finish).
  • (1) Ball chain 20 lb pull (breaking strength) This chain is common on neck style knives.
  • (10) #8 – 8 black rivets. Requires a .25 inch hole in the sheath for fastening.
  • (1) 2″ Belt Size Capable, Matching Color Custom Pre-formed CKK Design Kydex Belt Loop (w/fastening hardware)(Vertical/Horizontal carry) Universal Mounting Design

2 items not included that you will need are a RIVET PUNCH and a foam press (I show you how to make your own later).

STEP 2: Determine sheath size

Once you have everything rounded up and about an hour to invest, it’s time to determine your sheath size.  This doesn’t have to be exact because you can trim it down later.  Error on the side of too big.  Make sure the piece you cut is wide enough to cover your blade when folded over – I made mine wider to include space for a fire steel.  Also make sure it is long enough to cover the blade and about 1 inch up the handle.

Mark the kydex with a pencil and score it with a knife or razor.  Then you can break it fairly easily.

 

I had plenty left over for another project later…

STEP # 3: Make your press

In order to form the heated kydex sheet around your blade (or other object) you need to press the heated and pliable kydex sheet in a foam press.  You can buy these but they are pricey.  If you really get into making these it would be a good investment.  I made one out of an old foam thermarest seat and used a vice to apply the necessary pressure.

As you can see I cut 2 equal sections out of the seat and simply glued them to 2 scrap pieces of 1/2″ press board.  Your foam needs to be at least 1.5″ thick.  Have your vice nearby and ready to go.

STEP # 4: Heat your kydex sheet in the oven

I tossed my cut kydex sheet onto a baking pan and put it in the oven at 300 degrees and checked it every few minutes.  It took about 10 minutes to get nice and soft and pliable.  USE GLOVES.  Once it was pliable, I took it out and folded it over my knife blade…

STEP # 5: PRESS the kydex around the knife

I folded mine from side to side but I suppose you could do it from end to end as well.  I wanted to create a pocket on one side, though, for a fire steel.  DON’T WORRY – if you screw this up all you have to do is toss the kydex back in the oven and it goes back to it’s original shape.  I had to do this part 4 or 5 times to get it right.  You also have to work fairly quickly because as the kydex cools it hardens.  This all has to be done while it is nice and pliable in order to work properly.

Quickly, I sandwiched the knife and kydex wrap between my foam lined board and winched it down in the vice as tight as I could get it.  WAIT 10 minutes. (This, too, I did several times.)

STEP # 6: Draw out your final sheath shape with a pencil

It took me a few tries but eventually I ended up with this rough shape out of the press.  I decided to incorporate a fire steel which was a little tricky.  It would have gone quicker if I just stuck with the basic sheath.  Notice the kydex comes up over the handle about 1/2 to 1″.  This is important because it’s this section that holds your knife in the sheath once you are finished.

 

Once you take the knife out of the press, it’s time to draw on your final sheath design.

I just took a pencil and roughed out a quick shape and also marked where I wanted my rivets as well.

STEP # 7: Cut out the sheath shape

Using a hobby saw or band saw, cut out your sheath shape.

Then, drill your holes to match your rivet size.  Make sure your knife goes in and out well.  I held shut the sheath tight and tested taking the knife in and out to make sure it would work properly before punching my rivets.

STEP # 8: Attach your belt attachment and punch your rivets

Finally, punch your rivets and attach your belt attachment.  The belt attachment typically goes in place of two of your rivet holes and screws in with set screws.  It’s pretty simple.  As you can see I used a Tek-Lok Belt Attachment.  In retrospect it is a little bulky but very functional.

STEP # 9: Sand the edges and make final adjustments

Your finishing steps are to sand the edges.  I did this with a 4″ grinder to save time.  I also had to trim down the part where the handle went to make it easier to take the blade out.  Below are a few pics of the final product.

CONCLUSION

Custom molding kydex takes some practice and patience but with a little bit of both you can quickly become proficient with making custom sheaths and holsters for a variety of applications.  And, once you have the initial set of tools (rivet punch and foam press), the kydex sheets are really cheap.

So for all of you do-it-yourselfers out there, if you haven’t yet tried working with kydex I think it will be a fun project to take on this winter.

Let me know if you have any specific questions that I haven’t covered here – I will do my best to help you based on my limited experience with kydex.

All the best-

Creek

Comments

  1. Brooks Fuller says:

    That’s a blessing to know that you can make your own kydex sheaths at home! Christopher has make
    me one. Be sure that you get a chance to look at his web sight- ctfischerknives.com
    Going to try to order from BRK tomorrow, hopefully to get a Blackbird SK-5 and other fixed blades.

    Brooks
    PS- Got some more DVD’s for you soon.

  2. Mark H says:

    Thanks for the tutorial on Kydex… I’ve been researching how to make an IWB holster and after scrolling through HedgeHog Leathers’ site- I’d like to learn to work leather, too. Lots of info out on the WWW. A heat gun will also work well if you have a troublesome spot.

    Just an aside but that is one clean oven! Thanks again for the pictorial!

  3. Shepherd says:

    Kydex sheets can be bought from McMaster-Carr In black, gray, or white sheets. [Maybe someone wants a white sheath for winter -camo!] They call it acrylic/PVC but it is Kydex. They have up to 4′ x 8′ sheets in case you have a lot of sheaths to make or split it with your buddies.

    http://www.mcmaster.com/#acrylic/pvc/=f9d5w8

  4. nich says:

    Can the hot Kydex damage the knife you’re working on? I have a Mora Survival which has a rubberized grip that I’d be concerned about.

  5. Rob says:

    How does it sheath/ unsheath? Any issues with that?

    Some kydex sheaths have a feature where the knife “clicks” in to the sheath, does this method allow that?

    Can another piece of kydex be molded to the already molded sheath? For instance if I wanted to attach a fire steel rod like the one you have on top of the sheath as opposed to the side where you have it, would I be able to do that after I have already molded the sheath to the knife? Or is that something I would have to do simultaneously?

  6. tacfry says:

    Awesome! I want to do the same for my Gerber LHR. I was looking to buy one, but now I just want to make one.

  7. nice

  8. B. Fife says:

    In the 60s when I was a Boy Scout I made a similar sheath out of plastic from a chlorine bottle.
    It was BLUE but it worked fine. Was meant for a specific trip, waterproof for diving, didn’t have time
    to find or make one out of leather. Plastic sheath could have been a safety hazard but I didn’t fall
    and stab myself! Keep thinking outside the box…B.

  9. Pvc sheeting says:

    When I initially commented I clicked the “Notify me when new comments are added” checkbox and now each time a comment is added I get
    three e-mails with the same comment. Is there any way you can remove me from that service?
    Thanks!

  10. What's the best way to put in rivets? And how does the tek-lok attach?

  11. Perry Fowler says:

    tek lok is attached with screws i believe they come with it

  12. Edward B Ford says:

    Awesome! Thanks

  13. Pedro Anchaba says:

    I'm interested in making mi own kydex sheath for mi knife, but I don't own a heat gun (also recomended for heating the kydex) and I'm a little worry about heating it in the kitchen oven. My question is, is it safe to heat it in the oven? isn't it toxic?

  14. Peter says:

    I’m interested in making mi own kydex sheath for mi knife, but I don’t own a heat gun (also recomended for heating the kydex) and I’m a little worry about heating it in the kitchen oven. My question is, is it safe to heat it in the oven? isn’t it toxic?

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