Serrated flange nuts are a type of nut that features serrations (small ridges or teeth) on the bearing surface of the flange. The flange is the enlarged, flat portion of the nut that acts as a built-in washer. The serrations on the flange are designed to bite into the mating surface, providing enhanced resistance to loosening caused by vibrations or other external forces.

Here are some key characteristics and uses of serrated flange nuts:

1. Anti-Loosening Feature: The serrations on the flange create friction between the nut and the surface it contacts, helping to prevent unintentional loosening of the nut over time. This is particularly beneficial in applications where vibrations or dynamic forces are present.
2. Reduced Need for Additional Washers: The built-in washer in the form of the flange eliminates the need for a separate washer in many applications, simplifying assembly and potentially reducing costs.
3. Common Materials: Serrated flange nuts are typically made from common materials such as steel, stainless steel, or other alloys. The choice of material depends on the specific application and environmental conditions.

Applications: These nuts are commonly used in various industries, including automotive, construction, machinery, and equipment assembly, where vibration resistance and reliability are crucial.