What's the difference between a lock nut and a hex nut?

A lock nut and a hex nut are both types of nuts used in fastening applications, but they serve slightly different purposes. The main difference between them lies in their design and functionality:

Hex Nut:

A hex nut, as mentioned earlier, has a hexagonal shape and is used to secure a bolt or screw in place by threading onto it.

Hex nuts do not have any built-in locking features and rely on the tension created by tightening to prevent them from loosening over time.

They are suitable for applications where vibration and movement are not significant concerns.

Lock Nut:

A lock nut, on the other hand, is designed with additional features to resist loosening caused by vibrations or other factors.

There are various types of lock nuts, including nylon insert lock nuts, prevailing torque lock nuts, and others.

A common type is the nylon insert lock nut, which has a nylon ring inside the nut. When the nut is threaded onto a bolt, the nylon ring creates friction and resists loosening.

Lock nuts are often used in applications where there is a risk of vibrations or where maintaining a secure connection is critical.

In summary, while a hex nut is a standard nut with a hexagonal shape used for general fastening, a lock nut is specifically designed to resist loosening under conditions of vibration or other external forces. The choice between them depends on the specific requirements of the application and the level of security needed for the connection.