28mm Pin Thread Sizing

Can anyone clarify what the thread sizing is on both the 28mm stud pins and the 28mm 3-axis square pins? From what I can see the square pins are 1/4-20 and the stud pins are 5/8-11 but I haven’t been able to confirm that anywhere. The 28mm stud pins have no description and I’m not sure if the 3-axis square pins have all the same thread sizing.

I’m working on a unique robotic welding table application and as far as I can see these are some of the very few options for drop-in 28mm pins that have fastening ability for custom fixtures. I’d love to use the 8” fence as well but unfortunately we are using 100mm hole spacing.