Name the part!

April 25, 2013 1:21 PM

So I started a little maker-project,but I am new to all this and don't know the correct vocabulary to get what I need. What I need is a screw-nut with a little threaded hole in it's side so I can secure it with a little screw on the threaded rod I screw the srew-nut onto. It looks like this. Bonus points if you can tell me the german word for it. My second question is for a nice Forum where I can ask those beginners questions about mechanical problems. Maybe a nice Maker forum where all kinds of stuff like this and Arduino, 3D printing etc. question can be asked. Thanks!
posted by SweetLiesOfBokonon to Sports, Hobbies, & Recreation (8 answers total)

I think the "little screw" (in English) is called a set screw. Hopefully that leads you in the right direction.
posted by sparklemotion at 1:24 PM on April 25, 2013

Yep, set screw is what you describe. Your drawing is a bit more like a cotter pin, but I think it's just the simple drawing.
posted by humboldt32 at 1:31 PM on April 25, 2013

It might be a set screw or a grub screw, but those press against the shaft, they don't go through the shaft. If the yellow thing goes through the shaft it's typically not threaded and is called a pin. A cotter pin is a specific kind of pin.

I don't think it's common to fix a nut to a threaded shaft with a pin; I think whatever problem you're trying to solve would normally be solved in some other way.
posted by hattifattener at 1:39 PM on April 25, 2013

Don't know that I've ever seen a nut that has a setscrew on it. Sometimes you might use a shaft collar for that (they lock around a shaft), and there are threaded shaft collars that would screw on and then can be tightened up to lock them in place.

The other thing you can do is to use two nuts, and tighten them against one another so that neither can move on the threaded rod. There are special nuts for this called jam nuts but if you have room you can just use two regular nuts.
posted by BillMcMurdo at 1:47 PM on April 25, 2013

Response by poster: Yes, it should press against the shaft, because the shaft has just a radius of 2 mm and I can't drill such a small (r=0,5mm or 1mm) hole through it. The problem is I want to connect a threaded rod to a hand mixer. I already 3D printed a part that relied on my ability to drill such small holes through the shaft and I failed. Now I want to incorporate two lock nuts/ "Nut with Set Screw for Piston" into my design. They will be part of my 3D printed connection between mixer and rod. The rod is srewed into the lock nuts, secured by set screw, the lock nuts are secured inside my 3D part and the whole thing is then glued to the mixer.
posted by SweetLiesOfBokonon at 1:54 PM on April 25, 2013

Response by poster: To make it more clear, here is the picture of the thing. The blue thing rotates, in yellow you can see my failed design. It will be prolonged an the lock nuts will be incorporated.
posted by SweetLiesOfBokonon at 2:16 PM on April 25, 2013

This website has a number of pictorial guides to help you find the name of the part you are looking for (in the future). Its in english not german however.

Bold Depot
posted by Julnyes at 2:39 PM on April 25, 2013 [1 favorite]

Just thread on 2 normal hex nuts and tighten them against each other. Not only will they be easier to find, but this will be much less prone to rotate on the shaft than a nut fixed by a set screw.
posted by jon1270 at 5:08 PM on April 25, 2013 [1 favorite]