Hollow Shaft Maximum Torque Calculator

In Physics, particularly in the field of Mechanics, the study of torque plays a critical role. Torque is a measure of the turning force on an object. In the context of hollow shafts, which are often used in mechanical and structural engineering, understanding the concept of maximum torque is crucial. This tutorial will explain how to calculate the maximum torque that a hollow shaft can safely transmit without yielding or breaking. The parameters involved in these calculations include the maximum shear stress, the outside diameter of the shaft, and the inside diameter of the shaft.

Twisting Moment in Hollow Shaft Calculator
Hollow Shaft Maximum Torque Calculator Results
Maximum Twisting Moment = Newton/Meter

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Example Formula

The primary formula for calculating the maximum torque in a hollow shaft is given by:

Tmax = τmax × (π/16) × (D4 - d4)


  1. Tmax: Represents the maximum torque.
  2. τmax: Represents the maximum shear stress the material can handle without failing.
  3. D: Represents the outside diameter of the hollow shaft.
  4. d: Represents the inside diameter of the hollow shaft.

Who wrote/refined the formula

This formula is a derivative of the general torsion formula, a cornerstone of solid mechanics. The fundamental concept of torsion was developed by the French mathematician and 'The Last Universalist,' Henri Poincaré in the 19th century. The adaptation of the formula for hollow shafts, however, is a collective effort of numerous engineers and physicists over time.

Real Life Application

The calculation of maximum torque in hollow shafts is essential in various real-world applications, such as automotive driveshafts, bicycle axles, and in construction where hollow structural sections are used. Engineers often need to know the maximum torque a hollow shaft can withstand to design safe and efficient machinery.

Key individuals in the discipline

Hollow shafts and the understanding of their mechanics owe much to the foundational work of people like Leonhard Euler, Henri Poincaré, and more recently, Stephen Timoshenko. Their contributions to the field of mechanics have provided the groundwork for modern engineering practices.

Interesting Facts

  1. Understanding the mechanics of hollow shafts has revolutionized the automobile industry, allowing for lighter and more fuel-efficient vehicles.
  2. The principles of torque in hollow shafts have been applied to structural engineering, leading to stronger and more earthquake-resistant buildings.
  3. The development and understanding of this field have significantly contributed to advancements in renewable energy, particularly in the design of wind turbine shafts.


Understanding the concept of maximum torque in a hollow shaft is integral to various engineering fields. The principles discussed here have not only practical significance but also profound implications on safety and efficiency in machinery and structural design.

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