JUNKER TESTS PROVE CONSTANT PRELOAD Various vibration tests, including the Junker test (the most demanding vibration test for bolted joints standardised according to DIN 65151), have confirmed that the preload remains almost con- stant despite strong vibrations and that the loss of preload due to ‘settlements’ is very low, at approx. 15 %. The tests were carried out in the laboratories of REYHER, NORD-LOCK, HEWI and IMA Dresden. ] N k [ d a o e r P l Vibration Time [s] 1-ConicalNut-M8-Steel-16kN-0.3 The CONU nut has also demonstrated that an adequate securing effect can still be achieved, even when lower preload (such as 6 kN or 2 kN) are applied. 9