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Square Tube Center Calculator
The section properties like Inertia, Modulus, Area and Radius for a Square at center position cab be calculated though online Square Tube Section Properties Calculator.
Table of Contents:
Formula
Inertia = (a4- b4) / 12
  Modulus = (a4 - b4) / 6 * a
  Radius = ((a2 + b2) / 12)1/2 Area = a2 - b2
Structural or mechanical tube is(at least, externally) dimensionally accurate and has a bright finish. It is also made from mild steel, and sometimes rolled and welded too.
Example:
  Calculate the Square Tube Section properties for the given details.
  A (Exterior Side) mm = 25
  B (Interior Side)mm = 5
Solution:
  Apply Formula:
  Inertia = (a4- b4) / 12
  Modulus = (a4 - b4) / 6 * a
  Radius = ((a2 + b2) / 12)1/2 Area = a2 - b2
Inertia = 32500 (mm4)
  Modulus = 78000 (mm3)
  Radius = 2.124591463996994 (mm)
  Area = 600 (mm2)