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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.

Step 1: Supplies

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

<p>Neat idea! You might be able to use something like this hollow threaded rod to make it stronger, and just screw the nuts onto it. It may make the diameter larger though. &quot; am not sure the minimum diameter that the parts could fit into.</p><p></p>
Thanks! Yeah, that was an idea but I couldn't do it without a drill press, so I had to settle for this. With a hollowed out thread you would however need to construct the entire interior separately and then insert it as one piece, obviously making sure that it's the perfect diameter so it slides in but there isn't too much play that could lead to loose connections. Basically it would be a lot more professional but consequently require more skill.<br>If I end up making a third flashlight I'll try that. An M18 or M20 thread that would allow for a 15mm drilling and nuts with minimal outer diameter to minimize the overall mass (or possible aluminium? Or even titanium?), a powerful LED that uses the casing of the flashlight as its heatsink, and a 4.5V AA size Li battery as the power source. <br>If you were to use a hollowed out thread instead of nuts, you might not actually waste all that much volume, considering the nuts wasted space with their thread in the battery compartment. A battery in a hollowed thread would fit much more smoothly and with less play. Instead of a bolt as the battery lid you could use a round nut or something similar. Sorry for the long comment, I got carried away. Hope that helped though :)
<p>Hi you could use the insulation of thin wire also to insulate the led pins.</p>
I think i will make that too
<p>You seem to have gone a bit nuts with this one...</p>
If I had time, this would be my next project! Very good job presenting it! <br> Thanks for posting it! <br> Ken
great idea!! It looks really cool. The improvements will make it 100% better. <br> <br>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. <br> <br>keep 'em coming !!!
beautiful! .... but how much it weighs? <br>Imperio
About 112g including the button cells.
maybe ... if you used aluminum .... <br>
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.
Truly amazing! Is it too heavy to put it in your pocket and take it with you on the key chain?
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.
that is amazing!
Heavy for a small flash light. But Awesome!
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.
How about adding a superflux or even a power LED rather than the puny 5mm ones? <br>With the whole metal casing, you'll have decent heatsinking even for a luxeon star. Very nice idea tough. Looks tough and IS tough!
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<strike> don't</strike> drop it in to the nuts and bolts bucket.
Dude, this would make a nice self defence weapon if you made it longer.
rely nice concept 5\5 if your in any contest you got my vote.
Thanks! I entered in the <a href="http://www.instructables.com/contest/pocketsized2012/" rel="nofollow">Pocket Sized Contest</a>, and I'm waiting for it to be accepted.
Very cool looking project! I love the simplicity and size!
It&rsquo;s very resourceful and ingenious.

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