Torque testing: Screwed together close to the application

We use this term to summarise various test methods that are used to measure or specifically apply torque and the rotation angle to screw connections.

The purpose of the test is usually to determine whether a certain torque meets the specifications. For example, a thread-forming screw must not exceed a defined limit torque for forming the mating thread. This ensures that the screw is easy to screw in the application and that sufficient clamp force is achieved.

Other applications include checking screws and nuts with a locking effect. Torque testing is used to ensure that a bolted connection which is bonded by preapplied adhesives, for example, has a sufficiently high breakaway torque to prevent the screw from automatically loosening.

As with friction coefficient testing, it often makes sense to validate high-risk screw joints in addition to the standardised tests by means of application-related torque tests on components that represent the real screwing situation.

The functional principle of torque testing

In most cases, the fasteners to be tested are screwed together with standardised and prescribed reference parts. Depending on the item and application, these can be nuts or screws, but also, for example, test sheets for screws suitable for direct screwing. The torque and rotation angle are recorded during screwing in. This can be used to determine parameters such as the screw-in torque, fracture torque and breakaway torque. It is also possible to tighten to a specified torque to generate a clamp force in the connection.

In the application-related testing of fasteners and customer components, for example, the screwing process is carried out until the connection fails. Based on the values determined, a suitable tightening torque for this screw connection can be suggested using a formula. The recommended tightening torque ensures that the ideal clamp force is achieved without overstressing the connection.

Torque testing

Your benefits

  • Testing at speeds of up to 1,500 rpm
  • Testing from 0.05 Nm torque
  • Flexibly usable equipment especially for testing customer components
  • Specially developed process for determining the optimum tightening torque
  • Vast experience in the field of torque testing
  • We will be happy to advise you on the design of your application-related test.
Contact

Contact

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Please contact us at +49 7931 91-1595 or send an
e-mail to lab_request@wuerth-industry.com.

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