Hexagon nuts, also known as hex nuts, are one type of commonly used nuts found in a wide range of industries, including the automobile industry (cars, trucks, buses, etc.), construction machinery, wind power equipment, and more. These nuts are crucial for connecting and securing machine parts alongside screws, bolts, and other fasteners. Let's explore the characteristics and uses of different types of hex nuts.

Ordinary Hexagon Nut:

The ordinary hex nut is the most widely used type and is commonly employed in machinery, equipment, and structures with rough surfaces that don't require high precision. It serves as a general-purpose fastener found in various applications. This nut offers a relatively large tightening force but requires ample installation space. Live wrenches, open wrenches, or glass wrenches are commonly used during installation.

Cylindrical Inner Head Hexagon Nut:

The cylindrical inner head hexagon nut is extensively used for machines, equipment, or structures with relatively smooth surfaces and precision requirements. It provides a relatively large tightening force and can be conveniently operated using an Allen wrench. This type of nut is versatile and finds application in diverse structures. It boasts a neat and aesthetically pleasing appearance. However, its tightening force is slightly lower than that of the outer hexagon, and repeated use may damage the inner hexagon, rendering it non-disassemblable.

Pan Head Inner Hexagon Nut:

Pan head inner hexagon nuts are less commonly used in machinery but are frequently found in furniture. They possess similar mechanical properties to the aforementioned nuts and serve to increase the contact surface with wooden materials while enhancing the overall aesthetic appeal.

Headless Hexagon Nut:

Headless hexagon nuts are essential for specific structures, such as those requiring significant jacking force or where the cylindrical head needs to be concealed.

Countersunk Head Hexagon Nut:

Countersunk head hexagon nuts are predominantly utilized in power machinery and serve a similar purpose to regular hexagon nuts.

Nylon Lock Hexagon Nut:

Nylon lock nuts feature a nylon apron embedded in the hexagonal surface, which prevents the thread from loosening. These nuts are commonly employed in high-power machinery applications.

Flange Nut

Flange nuts, also known as pad nuts, tooth nuts, hexagon flange nuts, etc., are extensively utilized in power, communication, transportation, and other industries. These nuts offer several advantages, including integration of the gasket and the nut, anti-slip tooth patterns on the bottom, and increased contact surface area between the nut and the workpiece. This enhances the firmness and pulling force of the connection.

However, flange nuts have certain limitations. They are restricted by the workpiece, resulting in smaller specifications compared to regular hex nuts. Additionally, their irregular shape may require threaded fit. Flange nuts are commonly subjected to cold galvanizing surface treatment, as the hot-dip galvanizing process may introduce defects such as difficulty in screwing the threads after plating and reduced mechanical strength in high-strength flange nuts.

Flange nuts primarily serve the purpose of increasing the contact surface area with the workpiece and are frequently employed in pipeline connections or applications where enhancing the nut's contact surface is necessary.