Which type of lock nut is designed to prevent unintentional loosening?

The self-locking nut is specifically designed to prevent unintentional loosening due to vibrations and torque. This type of nut typically incorporates features that enhance friction between the nut and the bolt it is fastened to, such as a nylon insert or a special thread design that increases resistance to loosening. This design is crucial in applications where the fastener is subject to constant movement or vibration, ensuring that the assembly remains secure over time.

In contrast, a Keps nut, while it has a washer attached to prevent loosening, does not have mechanisms specifically dedicated to self-locking. A hex nut is a standard fastener without additional locking features and can loosen due to vibration unless used with additional washers or locking mechanisms. A wing nut is designed for easy manual adjustment and is generally not suitable for applications where a secure, vibration-resistant connection is necessary. Therefore, the self-locking nut stands out as the ideal choice for preventing unintended loosening.