Fasteners are well known and used in all industries throughout the world. Often fasteners may loosen due to loss of pretension load force as a result of vibration, thermal expansion or other mechanical factors. To alleviate this problem, a wide variety of lock washers have been developed. Lock washers attempt to prevent loosening by increasing the frictional forces between the nut and a stationary surface. Some examples include, a split ring lock washer, a star lock washer, or spring washers. Although these types of lock washers inhibit rotation of the nut by increasing the frictional forces acting opposite to the nut's rotation, they do not provide a positive rotation stopping force.. 

See the positive locking advantage!

In a similar manner, nylon inserts have been used to constrict the internal diameter of the threads on the exit side of the nut. Again, these inserts increase the frictional forces (in this case between the bolt and nut threads) that act to resist rotation of the nut. Alternatively, it is known to simply crimp the nut or to deform the nut or nut threads to increase rotational friction.  Glues, sticky strips, and other chemical bonding agents have been used to increase friction between the nut and bolt threads.  As in the case of lock washers mentioned in the above paragraph these methods of increasing the rotational friction do not provide a positive stopping force against rotation of the nut. In addition, nylon inserts, glues, sticky strips and chemicals bonding agents are more susceptible to deformation and failure caused by excess heat or corrosive agents. 

There is a positive locking advantage!

Therefore, a need exists for positive-locking fastener that prevents loosening of a nut brought on by loss of pretension load force. A need also exists for a positive-locking fastener that can be mass produced at a low per unit cost.  A further need exists for a positive-locking fastener that is easy to use - that doesn't require special tools - is versatile and reusable - has a rattle free locking mechanism - and can be applied universally to many different applications.  The Phil-Lok positive locking fastener is that fastener! 

Choose the positive locking advantage!

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