The PDF files below from Misumi have calculations for the load allowances for various sizes of their extrusion. The calculations are valid for V-Slot and the allowable load data is a good indicative guide for V-Slot 2020, 2040, 2060 and 2080.
https://www.misumiusa.com/CategoryImages/Metric_2009_pdf/p2349.pdf
https://www.misumiusa.com/CategoryImages/Metric_2009_pdf/p2351.pdf




