Please let me know what is the relationship between Zx & Zy with Iz & Iy in the sectional properties for a Tube say TUB1001005?

Question

I have to update a new section of tube of size 120mm X 120mm X 5thk. 
 I get Ix & Iy from consul. 
 then how do I calculate Z to update the table please?

Modestas · Accepted Answer

Z is a plastic section modulus. You can find more details about the relation ship between I, S and Z here: https://en.wikipedia.org/wiki/Section_modulus