Torque Analysis – Higher Process Reliability Thanks to Screw Joint Tests

Why Is Torque Analysis Necessary?

Thread-forming screws are used in the construction of machinery and many more applications. However, since the various materials, screw types, screw-in depths, hole geometries, and other parameters do not provide universal information on torques, torque analysis is indispensable for reliable screw connections.

In Bossard’s application engineering department, torque analysis is part of our day-to-day business. Torques in the range of 0.1–1,500 Nm can be measured and recorded at the test stations.

How Is Torque Analysis Performed?

Whenever possible, torque analysis is carried out on the customer’s original components. During the test, the connections are tightened until they fail. As a result, the components are destroyed in the test and can no longer be used.

How Is the Data Evaluated?

After the test, the recorded torque and angle of rotation curves are evaluated by our application engineers. The thread forming torque, seating torque and failure torque are determined. The resulting torque and angle of rotation curves can then be used to draw meaningful conclusions about the behavior and failure of the connections.

What Is the Goal of Torque Analysis And What Are the Benefits?

Several factors must coincide before a connection can be considered reliable. For example, the failure torque at which the connection fails must be significantly greater than the seating torque that is required for creating head bearing contact. Only then can the recommended tightening torque be reliably defined and you, as the customer, can be certain that the connection can be properly tightened, thereby minimizing your component’s risk of failure.

Why Is Bossard the Right Partner?

Our customers benefit from our highly qualified personnel and many years of experience in fastening technology. In addition, our ability to access state-of-the-art measuring and testing facilities forms the basis for reliable quality assurance and product quality.