📐 20x20 European Aluminum Extrusions with Slim T-Nut M5 Thread – Pack of 100 by TOPINSTOCK Review

I bought these to use on my original 8020 series 10 (1 inch) rails. You'll have to fiddle with them a bit to get them to grip as they aren't designed for 1" (25.4mm) rails but once they bite they work great. They're definitely cheaply made being about 20% of they're cut at the wrong angle, for the price I'm willing to live with that.

Used these when converting my Anet A8 to AM8 2040 Extrusion. I'm glad I went with them so I could add details later without taking things apart. Some of them were warped, but I've used them on non-essential parts like the LCD case. Spend a few bucks more and get a little more versatility with these 5mm+ Square Nuts. Square nuts are very difficult to extrude and I quickly gave up on them.

These parts came with oversized threads. They were cut with an M4 but the starter drill was much larger than it should have been. I had about 40-50 from this batch that just didn't work. You start tightening the bolt and it doesn't develop any real preload before it fails. I measured the hole diameter of some of them and they were in the 3.6-3.8mm range when they should be in the 3.3-3.5mm range. Luckily I had a few other T-Nuts left over from another project and was able to successfully…

First, and probably most important to many, is that they fit OpenBuilds V-groove profiles. They are nearly identical in shape to the male tees that Openbuilds sells/supplies and for about 10% the cost per nut. This prize is not without its own costs, however. There were a few small metal shavings in the bag that appear to have been left over from threading. When testing some nuts I noticed that about 20-30% of the nuts were difficult to tighten due to dirty threads and some pushed out bits of…