The test showed that the Twin-Lock® washers safely lock screws/bolt connections: the clamp force stays almost constant after 2000 cycles and just a minimal amount of tension dissipates at the beginning of the test due to the normal settlement of the fastened joint.
To develop the optimal results of the Twin-Lock® washers our R&D Department used the Junker Test Machine, in accordance with DIN 65151 Standard, to verify the performance of our washers in the presence of vibrations.
After exhaustive testing with the Junker Test Machine, Growermetal succeeded in engineering a top performing product in the presence of vibration and dynamic load. The following diagram shows the optimal security performances of Twin-Lock® washers in the presence of vibrations.
The blue diagram clarifies that is necessary to increase the clamping force in order to untighten the bolt after 2000 vibration cycles (click effect).