Square Tube Section properties Calculator

Welcome to this tutorial on the Square Tube Section Properties Calculator! In engineering, understanding the section properties of different structural shapes is essential for analyzing and designing components and structures. This tutorial will introduce you to the concept of square tube section properties, discuss interesting facts about square tubes, explain the formulas involved, provide a real-life example, and guide you through the calculation process step by step.

Square Tube Section properties Calculator
Exterior Side (mm)
Interior Side (mm)
Square Tube Section properties Calculator Results
inertia = mm4
modulus = mm3
radius = mm
area = mm2

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Interesting Facts

Before we delve into the calculations, let's explore some interesting facts about square tubes:

  • A square tube is a hollow, four-sided structure with equal-length sides forming right angles at the corners.
  • Square tubes are widely used in construction, manufacturing, and various industries due to their structural stability and versatility.
  • Their closed shape provides excellent strength and rigidity, making them suitable for applications where torsional resistance and load-bearing capacity are essential.
  • Square tubes are commonly made of materials such as steel, aluminum, or composite materials, offering a wide range of mechanical properties and applications.

Formula Explanation

The section properties of a square tube include the following parameters:

  • Area (A): The cross-sectional area of the square tube.
  • Second Moment of Area (I): Also known as the moment of inertia, it quantifies the distribution of the material around the centroidal axis and provides an indication of the section's resistance to bending.
  • Section Modulus (S): It relates the maximum bending stress to the bending moment and represents the section's resistance to bending.

For a square tube, the formulas to calculate these section properties are as follows:

Area (A) = a2

Second Moment of Area (I) = 1/12 × a4

Section Modulus (S) = 1/6 × a3


  • a is the length of one side of the square tube.

These formulas allow us to determine the section properties of a square tube based on its dimensions.

Real-Life Application

The calculation of square tube section properties has numerous real-life applications in various engineering fields. Let's consider an example in the field of structural engineering.

Suppose we have a steel square tube with side length a of 100 mm and a wall thickness of 5 mm. We want to calculate the section properties of this square tube.

Using the formulas mentioned earlier, we can calculate the section properties as follows:

Area (A) = a2 = 100 mm × 100 mm = 10,000 mm2

Second Moment of Area (I) = 1/12 × a4 = 1/12 × 100 mm4 ≈ 8333.33 mm4

Section Modulus (S) = 1/6 × a3 = 1/6 × 100 mm3 ≈ 1666.67 mm3

Hence, the section properties of the steel square tube with a side length of 100 mm and a wall thickness of 5 mm are:

  • Area (A) = 10,000 mm2
  • Second Moment of Area (I) ≈ 8333.33 mm4
  • Section Modulus (S) ≈ 1666.67 mm3

In real-life applications, knowing the section properties of a square tube is crucial for structural analysis and design. Engineers use these properties to determine the strength, stiffness, and load-bearing capacity of square tube-based structures.

For example, in the construction industry, square tubes are commonly used as columns, beams, or braces in building frameworks. By calculating the section properties, engineers can assess the structural integrity of these elements and ensure they can withstand the expected loads and forces.

In the manufacturing industry, square tubes are often used in the fabrication of equipment frames, machinery supports, and structural components. The section properties help engineers determine the optimal tube dimensions and ensure the structural performance and stability of these components under operational conditions.

To summarize, the Square Tube Section Properties Calculator allows engineers to calculate the section properties, such as area, second moment of area, and section modulus, for square tubes. These properties play a vital role in structural analysis, design, and optimization, ensuring the integrity and functionality of square tube-based structures. By understanding the formulas and concepts explained in this tutorial, you can apply them to various engineering applications and make informed design decisions.

We hope you found this tutorial on the Square Tube Section Properties Calculator informative and helpful. Remember to consider the side length and dimensions of the square tube when calculating its section properties. Best of luck in your engineering endeavors!