Instructables
For several years I have been planning on doing this project, but it wasn't until now that I actually tried it. My plan was to make a miniature LED flashlight out of hex nuts, using them as the casing. I would use a matching screw as the cap for the battery compartment, and add a keychain to make it easy to carry around. 
Here's how I did it.
 
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Step 1: Supplies

Picture of Supplies
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Things I used:
  • Soldering iron and solder
  • Third hand
  • Electrical tape (heat shrink tubing would be much more effective)
  • Clamps
  • Needle-nose pliers
  • Two part epoxy
  • Super glue (Krazy glue would be better)
  • Heavy duty scissors
  • Scissors
  • 6 18mm nuts
  • 18mm bolt
  • 20mm nut
  • Washers
  • White 5mm LED
  • Tactile switch
  • Switch cap
  • Wire
  • Ring for keyring (I don't actually know what that is, I just found it in my junk box)
  • Small spring
  • Positive terminal plate
  • 3 1.5V button cells

Step 2: Modifying the parts

The first part to making the flashlight was modifying the nuts and the screw.
For the nut with the switch, I drilled out  a hole that would be big enough for the switch and the cap.
For the battery compartment I also had to drill out the nuts, because even though the cells would have fit inside, I couldn't fit in the insulation. 

Step 3: Button

Picture of Button
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To attach the switch to the nut I used super glue to glue it in. If you do this, be careful that you don't get any glue on the button itself, or you won't be able to press it in anymore. 
Then I attached a wire to one lead of the switch, which would go to the positive battery terminal.
To make sure that the switch stays, in place, I jammed in a small piece of cork (wood or plastic would work just as well).

Step 4: Battery Holder

To the white wire connected to the switch I attached the positive battery connector. I made a small hole in the side of the connector to let the negative connector wire through (next step).
To insulate the battery compartment I rolled up a small piece of paper pushed it inside the drilled out nuts.
I glued a piece of paper (insulation) to the sawed off end of the screw and glued a small spring on top of that.

Step 5: Glueing it Together

I used two-part epoxy to glue all the parts together, but the most effective way to do it would be with silver solder. To let the glue set I clamped the parts together.
For the smaller parts of the flashlight (like the switch, the spring, etc) I used Scotch Super Glue, just because it's much easier to use it on very small surfaces, for details. Epoxy is much stronger, though, so use it whenever you can.

Step 6: LED

If you're good at soldering and you have a good iron this step won't be a problem. But I have neither, so this step was pretty hard. I was planning on making the LED much shorter than this, but it was hard enough at this length. Make sure that your legs are the wight way around (the longer one goes to the positive wire and the short one to the negative).
To insulate the two legs I used electrical tape. Not a very good choice, but I didn't have any heat shrink tubing.
When you get the LED to work you can glue on the rest of the nuts. To finish it off I added some washers at the front. The washers also hold the LED in place.

Step 7: Done

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That's it! There's your nut flashlight. 
Even though it works, mines had a loose connection. Here are some potential improvements:
  • Silver solder the nuts together: This will allow electricity to pass through the wall (nuts) of the flashlight, and will make the whole thing much more durable. That way you won't need to worry about the positive wire (the red one) getting entangled in the spring, and will create a much cleaner finish.
  • Use heat-shrink tubing instead of electrical tape: My best guess is that the insulation of the LED is what causes the loose connection. Heat-shrink tubing would make it much cleaner and would probably eliminate any short circuits.
  • Use bigger Nuts: Bigger nuts would make everything much easier to work with, and you wouldn't have to drill them out for the button cells to fit inside.
Post a picture of your own hex nut flashlight in the comments!
Nichjay176 months ago
I think i will make that too

You seem to have gone a bit nuts with this one...

anasdad1 year ago
If I had time, this would be my next project! Very good job presenting it!
Thanks for posting it!
Ken
Warmtint1 year ago
great idea!! It looks really cool. The improvements will make it 100% better.

You do pretty good instructables which is just as much of a talent as the project itself. The diagram you added was a nice touch.

keep 'em coming !!!
imperio1 year ago
beautiful! .... but how much it weighs?
Imperio
sjroth (author)  imperio1 year ago
About 112g including the button cells.
imperio sjroth1 year ago
maybe ... if you used aluminum ....
sjroth (author)  imperio1 year ago
Nah, that would be too soft and wouldn't seem as heavy-duty. I prefer the steel, even if it is heavier. And it's not that easy to find aluminium hardware.
kukubee1 year ago
Truly amazing! Is it too heavy to put it in your pocket and take it with you on the key chain?
sjroth (author)  kukubee1 year ago
I don't keep it on a keychain because I don't quite trust the epoxy. But if you're confident that it won't fall apart as it's swinging and knocking around, I guess it would be fine.
tritian1 year ago
that is amazing!
TSC1 year ago
Heavy for a small flash light. But Awesome!
sjroth (author)  TSC1 year ago
Yeah, I know the weight is an issue, but somehow it makes it seem more heavy-duty.
I agree, a little weight on an object makes it seem more high quality and less cheap and flimsy.
bhvm1 year ago
How about adding a superflux or even a power LED rather than the puny 5mm ones?
With the whole metal casing, you'll have decent heatsinking even for a luxeon star. Very nice idea tough. Looks tough and IS tough!
racoontnn1 year ago
A fun and safe thing to use in the plumbing trade. I often break down plastic lanterns, when to put it together with tools.
I would give this a thumbs up ,if there was such button, and well what can i say this would be a good gift the the handyman of the house :D, just don't drop it in to the nuts and bolts bucket.
CR15P331 year ago
Dude, this would make a nice self defence weapon if you made it longer.
batonas1 year ago
rely nice concept 5\5 if your in any contest you got my vote.
sjroth (author)  batonas1 year ago
Thanks! I entered in the Pocket Sized Contest, and I'm waiting for it to be accepted.
Warfusion1 year ago
Very cool looking project! I love the simplicity and size!
J-Five1 year ago
It’s very resourceful and ingenious.