Rambox Utility Rail TOP slot tnut size

[Paddy3101]

Has anyone a source of Tnuts to fit the top slot of the utility track?

I have found answers about the size of the side slot on the utility rail (and have some from amazon), but not found any sources of sizes, or actual nuts for the top-slot. Does not appear to be a standard size?
Would rather avoid trying to cut/tap my own.

I need to attach some 2x2 inch Aluminum Extrusion (10 series) cross bars.

 

[werard]

You can look here: https://www.tnutz.com/aff-id/jpcors...-rKM-v7rWoSRyaLGuy6jXjS4_2iOL55xoCAD8QAvD_BwE they may have what you need. Or here: https://8020.net/fasteningmethods.html

 

[Paddy3101]

So found the answer by trial and error.

The tnut size you need for the top slot is for a 40 series extrusion (40mm Metric size)

19.5mm t width with 8mm slot. m6 screw, fits perfect.