Picture of Magnabiner - Build your own Carabiner
Stress Test.jpg
Hey everyone. Today we undertake a new adventure in the previously unfamiliar realm of metal.  This month of January I was taught how to use a wide range of metal tools and realized the endless realm of possibilities that can be created using metal and metal tooling techniques.  Here is my first, completely metal, project.

I present to you the Magnabiner, a carabiner unlike any you have ever seen before.  The Magnabiner uses magnets to attract the gate (part that opens on a caribiner) to the frame.  In addition to using magnets, the frame can rotate 360 degrees.  No longer are you limited to a single line of freedomas found in traditional devices; now you can open it in whatever direction is easiest.  Also, to ensure the gate does not become unlocked by accident, the gate features a slide on it that springs up, prevented any unwanted movement yet it i still able to be opened using one hand.  On opposite, top side, there is a wire gate to attach your caribiner to belt loop or any other loop available without having to utilize the main gate.  Finally, the skeleton frame allows for a lightweight, sleek design to complete this revolutionary new device.

The best part is, you can build this for yourself and impress all who see it.  I hope to show you in this project how to take an idea drawn on a piece of paper in a finished, useable product that you can make yourself.

As always, my name is Christian Reed and I am currently a sophomore at MIT with a passion for building things.  Here is my blog.  Hope you enjoy and do not hesitate to ask any questions you have!

EoinK12 months ago

Hi Christian,

Really enjoyed your magnabiner instructable.

I was wondering about the wire gate clip, I've been trying to make my own nut tool with an integrated wire gate but I can never get the desired tension on the clip, either not enough tension, the spring wants to act in the opposite direction. Any tips would be greatly appreciated

raykholo3 years ago
You might be interested in a magnetic biner actually designed for climbing use.


I'm planning to get a Gridlock version as soon as it comes out in July for belaying purposes.
crreed (author)  raykholo3 years ago
I've seen that one too; I really want to get oen to play around with and see how functional it is.
raykholo crreed3 years ago
My $0.02 on that is that all the locking biners I currently use are screw-locks. I'm getting a GriGri in a few months and I'm trying to decide between several of the Petzl biners, which come in screw-lock, ball-lock, or Triact (which I don't like) or the BD gridlock in either screwlock or magnetron. Good thing I live close to an REI. :)

Anyways, from what I saw in the video demo, the magnets repel each other enough for the unit not to jam up in any way, but are otherwise not strong enough to attract any other metal.

The big issue is that magnet strength by itself is not strong enough to keep the gate from getting pushed open with enough force. I really hope that they "extruded" the magnet toward the center plane a little bit, so that they rest in a notch inside the nose of the biner.
wingman3583 years ago
This is awesome! And I say that as a mechanical engineer and rock climber.

I really like how the wire gate loop is separate from the main loop. Brilliant. Also, the multi directional magnet gate is a terrific idea. I'm a little confused though - is there some sort of locking mechanism to prevent accidental opening?

In your FEA, it's obvious the weak point is the corner. Why not skip the hollowing on the corner for a much greater max load?

If you choose to continue working on this design (I think you should), you might consider the shape of existing carabiners. Some are rather pear shaped, which encourages the rope to settle into the corner, reducing the moment arm and thus the stress in the corner.

You might also check out eccentricity of the neutral axis in a curved beam.
crreed (author)  wingman3583 years ago
To answer your questions
1)Yes, the gate slides up over the top so unless you pull down and push to the side, it will not open
2)Not hollowing the corner is an idea but I really have no need for it to be any stronger as i plan on using it for camping and just holding gear so no need for it to have a large weight capacity.
3) I like the pear shaped idea and I was trying to design the next generation to utilize that a little more (as well as anodizing the components) so Ill let you know if there are any developments on that.
rickharris3 years ago
Nice have you strength tested it (to destruction) ?

Wouldn't recommend you risk your life on it! :-)
crreed (author)  rickharris3 years ago
I just added a photo of a stress test simulation to the first step if you want to check it out.
swighton crreed3 years ago
What loading are using in your FEA simulation?
crreed (author)  swighton3 years ago
I fixed the top part of it then applied the force to be distributed along the bottom.
Llewellyn3 years ago
Thats sweet. I like the double gate, looks fancy. It does seem a little backwards to have the locking gate open the way you do though. If anything, having it this way requires two hands to hook things onto the biner. While if you have the hinge on the other side, you can unlock the gate, open the gate, and hook whatever with one hand

lovely job, however
crreed (author)  Llewellyn3 years ago
Its pretty easy to open it with one hand but I guess there is no reason why I made the gate open that way. Perhaps the next version ill try to place the gate on the other end and see how that looks.
parafoil3 years ago
I really like your design with the almost figure 8 shape and double opening but
I believe the magnet is on the wrong end. It would be easier to get small things on if you reversed the locking mechanism... Is there a reason you choose to make it the way you did?
crreed (author)  parafoil3 years ago
I'm not actually sure what you mean?
skylane crreed3 years ago
I'm pretty sure he meant gate should open at the bottom.
Very cool concept! Have you thought about different sizes and styles? I'm always looking for new and interesting ways to attach crap to my bags, have you thought about marketing them?
crreed (author)  redclayswede3 years ago
Possibly, working on a more durable version and then maybe make a few more versions to sell but we'll see.
Pat_Maroney3 years ago
Nice work, but I'm wondering why the large gate doesn't open at the other end.
I'm also curious why you chose a ball joint instead of a hinge?
crreed (author)  Pat_Maroney3 years ago
The gate opens the way it does so that its easier to drop things into the carabiner rather than pulling them up from underneath and the ball allows more ways to open the gate and attach whatever you want to the carabiner depending on which way the carabiner is oriented or if both or one of your hands is free
Very nice and your shop is über impressive. But not sure I would want to trust something I made hanging over a 150 ft. drop off.
crreed (author)  barefootbohemian3 years ago
Thanks a lot, but again, as stated previously, its not meant to be a rock climbing carabiner.
True, guess I get focused on climbing every tine I see a caribiner even if it's just on a ket chain. It's an addiction lol
wow, very impressed
crreed (author)  projectsugru3 years ago
lexelok3 years ago
good job. http://www.compras.ru/
Jayefuu3 years ago
Great project! Would not trust it for using under load, but it's a very pretty and interesting machine shop project! Well done :D
crreed (author)  Jayefuu3 years ago
Thanks! Again, its safe to use as you would any other non-climbing carabiner but yes, it clearly should not be something you use where safety is any concern.
T-K3 years ago
Great idea!
soul_eater3 years ago
Amaizing design , good job
ilpug3 years ago
Looks like the weak point is the mounting rod for the ball bearing. Other than that, nice!
thegeekkid3 years ago
Good thing you mentioned it wasn't for rock climbing! The first hard fall someone had on that would have opened it right up! Nice work, though. :)
50-503 years ago
have you entered the make it real comp??
this is bound to win something.