Eowpower 100Pcs 20 Series M3 Pre-Assembly T Slot Nuts for 2020 Aluminum Extrusion
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That was the case with mine too.
The slots in the aluminium extruded from 2020 were made with these. It may be of some help.
Basically, it can be used with any set of base 20 extrusions
Selected User Reviews For Eowpower 100Pcs 20 Series M3 Pre-Assembly T Slot Nuts for 2020 Aluminum Extrusion
I like this much better than the teeny t-shirt, it doesn't spin around in place like the teeny t-shirt did The CNC manufacturer supplied the nuts. This is what you need!.
There were others with holes that weren't in the center or with bad threads. Many of them do not function properly, but the good ones work fine. The only thing wrong with it is the It seems like there should be some better quality control, though.
There was no match for any of them. It appears that some of the dimensions are right, but all of those I received are too high to fit The extrusions weren't just one set from one manufacturer, I have three sets for machines from three different manufacturers and not one of them fit.
Not all of them fit together. There are about 10 out of every 100 that don't fit into the extrusion, and I like them. There is no doubt the problem can be solved with a second filing. Until now, I have not done it.
There is very little slop between them and the Zyltech extrusions, so the parts appear to be well made.
You shouldn't forget to load all the bolts you think you will need, because they cannot fit into the beams once you start assembling the frame.