How to conduct rigorous Junker vibration tests

Locking threaded fasteners is essential to prevent bolted joints from becoming loose.
Engineers designing new bolted joints, fasteners manufacturers and distributors rely on the fastener transverse vibration test to compare the relative performance of fastener locking solutions and design safer products.

The Junker test procedures described in ISO 16130, DIN 65151 and DIN 25201-4 B standards allow the collection of accurate and repeatable test data. An unsecured fastener sample is submitted to transverse vibration cycles, at increasing displacement values, until it self-loosens. The secured joint is then tested in the same conditions.
The preload is plotted against the number of load cycles to assess the secured fastener self-loosening behaviour.

With additional data such as the transverse force, the tightening torque and friction coefficient, the detailed dynamic analysis of the fastener performance aids engineers specify the safest fastening solution for a given application.

Learn how to conduct a fastener vibration test according to DIN 65151, DIN 25201-4 or ISO 16130.