In the field, vibration can cause loaded joints to loosen over time. To demonstrate the effectiveness of different bolt securing methods, Nord-Lock® uses the Junker Test. The Junker Test subjects bolted joints to extreme transverse vibration and measures the bolt stress using a load cell.

The Junker Test compares Nord-Lock® washers to other locking methods that are common to Western Canada. Although these methods are common, they prove to be ineffective when subjected to the vibrations of the Junker Test.


This video demonstrates the ineffectiveness of common bolting solutions and the superiority of Nord-Lock’s® wedge-locking washers. Precision Bolting Ltd. has a Junker machine and in-person demonstrations can be arranged by contacting Precision Bolting Ltd.

For more information, visit the Nord-Lock® website or contact Precision Bolting Ltd.