UNIVERSAL KEY

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Hello everyone dear friends! Today we will make a very simple and effective device, which is likely to be useful to people who are engaged in car repair, plumbing, carpentry, etc. Such a thing may well come in handy in ordinary home life.

This simple contraption is a universal key that can unscrew anything. The spanner perfectly copes with any diameter of nuts and bolts, and it also has an excellent coupling with any smooth surfaces, such as a water pipe.
Compared with the universal gas key, this design has certain advantages. The gas key has only two engagement planes, which in turn can deform the untwisted part under high pressure. Our tool has a “soft” girth due to contact on the entire plane of the unscrewed part.
Test on a wooden log. On the left is our universal key, and on the right is the gas one.

Also, because of the specificity of its design, this key is endowed with the ability to work as a universal key with a ratchet mechanism: preventing the parts from scrolling in the right direction and easily transferring to the beginning in the opposite position.
To make such a universal key, you need only two details:

- Square metal profile 25x25 300 mm long.
- Motorcycle chain 500 mm long.

Universal Key Assembly

The assembly is incredibly simple and will take you no more than 5 minutes with the preparation.
All you need to do is weld one end of the chain to the metal profile. Welding is best done on both sides of the chain.
On this assembly is over. The universal key is ready to use.

Using a universal key

Skip the second end of the chain to the center of the profile and you get a ring that you just need to wear on the part that you want to unscrew.

In this tool, the chain is taken to break and the greater the lever force, the stronger the grip force of the chain will be.
The key perfectly hooks both round objects and faceted ones. For him there is not much difference, whether it be a nut or a pipe.

Test

Round pipe key test:

Sample of a key on a hex nut:

The result in all cases is simply excellent. The engagement is high. It doesn’t do anything.
Also, this miracle perfectly turns plastic and polypropylene pipes, without significant deformations, which is so important when working with soft plastic.

This useful key does not take up much space in the car, in the garage or at home. But it may be useful to you at the right time.
So friends, feel free to make yourself your universal key.