T-nuts compatible with Black Aluminum Extrusion 20x20mm (RB-Lyn-949)

I recently bought these aluminum extrusions

I need m3 t-nuts so I bought these from amazon thinking they were compatible

Was rather disappointed when I got them and saw they didn’t quite fit in the extrusion due to the shape. Which nuts should I be using for this extrusion? Does this extrusion have an uncommon profile?

Hi @tmathers and welcome to our forum!

These nuts should fit for sure since they are from the same manufacturer:


Are the nuts that you bought too big or too small for the profile?

Thank you.