Introduction: Make a Two Bladed Wallet Knife From a Hack Saw Blade

Picture of Make a Two Bladed Wallet Knife From a Hack Saw Blade

Make a Two Bladed Wallet Knife from a Hack Saw Blade

Step 1: You Will Need:

Picture of You Will Need:

You will need a cheap hacksaw blade. Why cheap? So that the steel is right. High carbon not bi metal.

Bend and brake off a section of blade about the length of a credit card is long.

Step 2: Grind and Shape the Tip Your Blade. No Grinder: Use Aluminum Oxide Sanding Paper.

Picture of Grind and Shape the Tip Your Blade. No Grinder: Use Aluminum Oxide Sanding Paper.

Grind and shape the tip your blade. No grinder: use aluminum oxide sanding paper.

Step 3: Keep It Cool by Dipping It in Water.

Picture of Keep It Cool by Dipping It in Water.

Keep it cool by dipping it in water.

Step 4: Grind the Teeth Off the Cutting Edge.

Picture of Grind the Teeth Off the Cutting Edge.

Grind the teeth off the cutting edge. The trick here is to only just grind off the teeth and no more as this is were the steel is the hardest and will keep the best edge. Note water dripping off blade: Keep the blade cool! or you will take the temper out and it will not keep an edge when you sharpen it.

Step 5: If You Want You Can Sharpen the Blade on a Sharpening Stone.

Picture of If You Want You Can Sharpen the Blade on a Sharpening Stone.

If you want you can sharpen the blade on a sharpening stone. But mostly it should be very sharp off the grinder.

Step 6: Now Make a Paper Sheath for Your Wallet Knife. Size Your Paper As in Photo.

Picture of Now Make a Paper Sheath for Your Wallet Knife. Size Your Paper As in Photo.

Now make a paper sheath for your Wallet Knife. Size your paper as in photo.

Step 7: Fold Paper As Shown

Picture of Fold Paper As Shown

Fold paper as shown

Step 8: Continue to Fold:

Picture of Continue to Fold:

Continue to fold:

Step 9: Unfold and Then Fold Up Tip to Close End:

Picture of Unfold and Then Fold Up Tip to Close End:

Unfold and then fold up tip to close end:

Step 10: Refold:

Picture of Refold:


Step 11: And Tape Closed:

Picture of And Tape Closed:

and tape closed:

Step 12: Hold Knife As Shown to Use:

Picture of Hold Knife As Shown to Use:

Hold knife as shown to use:


awesomeepiceli (author)2012-07-02

Awesome. Small enough to keep in your wallet

spenfisher12 (author)2010-10-14

the hole looks like a good lanyard hole

zigzagchris (author)2010-04-26

Doesnt look to effective. I have a inch long swissarmy folding knife and a larger knife disquized as a key. Just other options to small self defense tools. I really like they key. It was only 2 dollars but very useful and sharp I sharpened the point so it can allso stab.
the bottom one is the exact one i have

im_tux (author)2008-01-05

nice idea the saw blade idea is a good one.... ill probally make one to repace the razor blade in my wallet

imakeknives (author)im_tux2010-02-17

keep the razor dude.....just in case

Kiernan (author)2009-10-21

round the end and sharpen the dull side of this then you have a knifesaw

weaponscollector94 (author)2009-08-19

is the thing for self defense or survival or something? if it is for self defense i have my jet black stiletto witch is bigger! but then again i wont always have my stiletto, i will make one of these knives that folds! ingenious!

Marble of Doom (author)2009-07-15

A little hard to hold.

asoos1 (author)2009-06-10

PlastiDip could work for a handle. Then still with the paper to save your wallet,coat, etc.

JamesRPatrick (author)2008-03-18

I bet it would hurt just as much if you left the blade the way you bought it.

mazeka.14 (author)JamesRPatrick2008-12-02

the idea is self defense not assassination. ;)

ac-dc (author)mazeka.142009-04-16

I think it would be the opposite. For self defense a shallow tear cut is effective in warning someone and producing a lot of visible blood without deadly damage to organs, but a ground-down blade would cut deeper and do more permanent harm, but the cleaner cust would not necessarily cause as much pain and startle the aggressor as much in the next few seconds.

mazeka.14 (author)ac-dc2009-04-23

oops you right, i must been tired that day.

JamesRPatrick (author)mazeka.142008-12-02


Fitwit (author)2008-01-17

This would not be a self defense item. Guaranteed loss of your own blood. But, a great utility tool idea.

ac-dc (author)Fitwit2009-04-16

Indeed, plus when law enforcement sees a homemade cutting device they call it a weapon more readily than an off the store shelf _small_ pocket knife. When they see that someone took the time to make such a thing, they tend to assume a person planned ahead about using it as a weapon and knew of a danger but put themselves into that danger anyway, just as they would if someone carried a large combat knife instead of a small pocket knife.

imthatguy1125 (author)2009-01-24

just buy a cheap knife cause you could cut yourself while tring to use this

mowie (author)2008-06-15

so all i need is a hack saw blade and that sand paper stuff

Shadowfury (author)mowie2008-12-09

"Abrasive grain". Don't get the two confused.

freerunnin1 (author)2008-10-19

try a maccano handle cos the bolts might fit through the hole at the end

cry_wolf (author)2008-01-05

Shouldn't you dip the end you hold in a liquid rubber coating thing? I'm not sure what its called but you dip it into this thick solution that coats and seals it in this thick covering so it will not injure your hands in use. Nice instructable though.

Matin (author)cry_wolf2008-01-05

That's an idea but it would make it thicker and prevent the use of the saw function of the knife. It feels find to hold on as shown in the photos. This knife is intended for light use for cutting string, fruit, etc. however it could be used to cut through a seat belt if you were ever trapped in you car after an accident. The idea is to make a knife that is small and thin enough so you could always carry it with out complaint and always have it handy. I was up on the roof of my house the other day when I realized I needed to cut the cord that was tied to my TV antenna. I was trilled to realize I did not have to climb down get a knife and climb backup up there. I have found it to be great tool. Make one you will love it!

cry_wolf (author)Matin2008-01-05

Ah, see i was looking at this from a totally different perspective. As in a situation where self defense would be needed. In your case, thats perfect. I'm gonna make one too, but where can i can saw blades, i'm only 14. :D

use the blade from an old pair of scissors.

"but where can i can saw blades"

I'm assuming you mean "where can I get"? If your dad has a hacksaw (chances are he does) he probably has a handful of extra blades. If not, you should be able to get some at any hardware store, or possible (A big possibly) a dollar store, if you've got a big one near by.

Sorry that was a weird mistake. Ok, thanks a lot!

Huray4Insanity (author)cry_wolf2008-03-04

they have he special dip comes in a paint can its made for redipping the handels of old tools like pliers or hammers and stuff or you could just use latex paint

Its called Plastidip, you can buy cans of it at most hardware stores. I wouldn't add it to this knife because now you could use it as a saw.

QwertyuioLP (author)2008-07-30

what's with the sand paper why no grind i?

blakdragon19 (author)QwertyuioLP2008-09-06

so you don't heat it up so much that the tempered steel becomes "untempered"

bruuno (author)2008-06-14

i was gonna make 1 of these to put in the collar of my jacket tmuch props man

J K Malakar (author)2008-04-15

Dear Mr. Matin, I have seen your mini knife in the web and impressed.But I also have made many knives from used hacksaw blades and fixed different handles.I can show them all-hope you'll like them.Also I have made two foldable mini knives. Thanks. Malakar

GorillazMiko (author)2008-01-05

Nice job, it looks pretty cool, I might try it out.

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