Hex Flange Nylon Insert Lock Nut

Nylon insert lock nuts are a type of hex nut that features a captive nylon washer in the top, designed to create a prevailing torque and prevent loosening. The nylon washer compresses against the mating threads, creating a tight grip that resists vibration and movement. While they are not suitable for high-temperature environments or exposure to certain chemicals, they provide an effective seal against moisture and gases.

These nuts come in various colors, with some manufacturers using specific hues to indicate different grades or applications. They are commonly used in aerospace, automotive, industrial machinery, appliances, and more. There are different types, such as regular, thin pattern, and machine screw versions for general use, and heavy pattern ones for structural and heavy-duty applications.

Nylon insert lock nuts are also known by other names, including aircraft lock nuts, elastic lock nuts, nyloc nuts, and nylock nuts. Due to the nature of the nylon insert, these nuts can be reused a limited number of times before the washer loses its effectiveness. It’s important to note that lock washers are not typically used with these types of nuts since the nylon provides sufficient locking force.

In addition, these nuts are often used in conjunction with split pins, R-clips, or safety wires for added security. For example, castellated nuts are frequently used in low-torque applications like securing wheel bearings.