12 Pcs 4040 Series Sliding T Nuts Metric M8 Thread Slide in Hammer Head T-Nut, Sliding T-Nuts for Standard 8mm T-Slot Aluminum Extrusion Profile

Way too many of these T nuts do not have threads on them. The quality control is terrible. The ones that do have threads work fine.

These are just fine for m3 t-nuts, but a few have issues m4’s in m3 package, or no thread, 1 not punched through (see photo).All of these are only half threaded through the nut unlike Kootans t-nuts which have thread through the entire nut, but being m3 how much torque are you expecting? So just fine I guess.

Exactly what I was looking for. Used them for 2020 extrusions and they work great.

Ordered the 3mm version. They fit with plenty of clearance on my Creality printers. Now I don't have to wonder if the twist in style I was using is actually turned and locked into place or not.

This kit worked well - the nuts fit the slots and received the bolts without issue.

Roughly 10% of the product did not work. It had either not been tapped, was mis-tapped, or was tapped for a larger bolt than what it was meant for.