The undesirable failure of any screw connection is brought about by two mechanisms: working loose and unwinding.
Working loose may be caused by settling effects and results in the loss of pretensioning force. Unwinding is caused by dynamic loads such as vibration acting on the axis of the bolt or screw. Such loading may cause turning forces to appear, which cause the bolt to turn loose, resulting in complete loss of pretensioning force. An effective locking element is needed to oppose these two mechanisms.
The design of the teckentrup washer is based on the combination of serrated surface and cup spring geometry. The positive-locking action under the screw head or nut is provided by the serrated surface of the washer.The force-locking spring effect is provided by the geometry of the washer and the elastic properties of the material.
Due to the combination of geometry and serrated surface, the teckentrup locking washer is able to oppose the mechanisms of working loose and unwinding and therefore represents the optimal screw- and bolt-locking solution.
teckentrup has optimised the proven principle of the serrated washer in its new range of NSK washers in response to demands for increased screw-locking effectiveness. Under screw-loosening conditions, the shape of a locking washer is decisive. With its two points of contact and stable arched form, the NSK washer works to oppose any loss of pretensioning force and in doing so outstrips the performance of all conventional screw- and bolt-locking solutions.