Socell 180Pcs 2020 Series T Nuts,M3 M4 M5 T Slot Nut Hammer Head Fastener Nut Nickel Plated Carbon Steel Assortment Kit for 20 Series Aluminum Profile - Nickel Plated Carbon Steel

Perfect for my project machines

Loads and loads of nuts for the money.Unfortunately the plastic box was smashed and the nuts were all mixed together in the packaging. They were bought to be used on my 3D printer so I just printed a new box...Have had no problems at all with the nuts, just could be packaged a little better when being shipped.

work well for what i use them for

When I saw these, the ability to insert them into a slot on 2020, 2040, etc. extruded aluminum rail was very attractive. Looking at the rails on my laser engraver, I also thought that these were likely to be difficult to use. The price was decent so I bought them to try. I learned my skepticism was wrong.These are not super easy to install, they do take a wee bit of work to get them correct, but not much. The first thing you notice is that each end has a squared corner and a rounded corner. The rounded corners are opposite each other. They are also what allows this nut to turn in the track. I used a screw and screwdriver to help install these. I screwed the screw into the nut and used it as a handle to put the nut in place. The small screwdriver came in handy to help rotate the nut in place, after which the screw was removed. Since these do rotate in the track when loose, you should install them and the piece going on them at the same time to keep them from sliding and possibly turning when moving the project.This minor issue - and issue is not really right, annoyance or inconvenience might be better - is not big enough to warrant loss of a star. Maybe a quarter of a star, bit not much more. Would I use these again? Absolutely - in fact, I am not done with them for my laser engraver project.

These are working great on a couple of projects. Just remember to use Loctite if your project vibrates at all.