《《Nord_Lock_tech_US_Inc 2》.pdfVIP

Technical information A closer look NORD-LOCK’s proven wedge-locking method meeting DIN 25201 utilizes tension instead of friction to secure a bolted joint, making it superior to traditional methods. The NORD-LOCK bolt securing system incorporates a pair of washers that have α β cam faces on one side with the cam angle α “a“ greater than the thread pitch b”. In addition, there are radial teeth on the opposite sides. The pre-assembled washers β are installed in pairs, cam face to cam face. When the bolt and/or nut is tightened the teeth of the NORD-LOCK washers grip and lock the mating surfaces, allowing movement only across the cam faces. Any rotation of the bolt/nut is blocked by the wedge effect of the cams.  The talent behind the curves Working together with us can optimize your applications. Put your bolted joints to the test simulating a worst-case scenario. At our in-house laboratory we run vibration tests and measure torque-load ratios. The Junker vibration test meeting DIN 65151 is an excellent method for testing and comparing the security of bolted joints. In a Junker test the bolted joint is subjected to transverse movements while the tension is being continuously measured by a load cell. The diagram displays NORD-LOCK´s superior performance. Most of the commonly used locking devices show limited holding performance when exposed to vibration. Whereas, bolted joints secured with NORD-LOCK washers only lose some of the initial preload due to normal settlements between the contact surfaces. NORD-LOCK’s unique wedge-locking function is proved by the clear increase in clamp load during untightening. Vibration test