A flange nut is a type of nut that has a flange at the bottom, which acts like a washer. The flange increases the contact area between the nut and the surface, thereby distributing pressure and reducing the risk of surface damage when the nut is tightened. Flange nuts are often used in high-speed assembly processes as they simplify operation and improve assembly efficiency.

The flange can be either flat or serrated. A serrated flange is more effective at preventing the nut from loosening, as the serrations bite into the contact surface, increasing friction.

The characteristics of a flange nut include:

1. Flange design: The nut has an extended flange at the bottom, similar to a washer, which increases the contact area and distributes pressure.

2. Reduces surface damage: The flange helps reduce surface damage to the workpiece when the nut is tightened, especially on softer materials.

3. Self-locking function: Serrated flange nuts can prevent loosening by increasing friction, providing anti-loosening capabilities, especially in applications that involve vibration.

4. Easy installation: Compared to traditional nuts, flange nuts do not require additional washers, simplifying the installation process and improving assembly efficiency.

5. Wide application: Flange nuts are widely used in industries such as automotive, machinery, and construction, where fast assembly is required.

6. Materials and surface treatments: They are typically made from carbon steel or stainless steel, with surface treatments like zinc plating or nickel plating to enhance durability and corrosion resistance.

Precautions for using flange nuts include:

1. Choose the appropriate flange surface: If anti-loosening is required, select a serrated flange nut. If the surface cannot be scratched, use a smooth flange.

2. Direction of the flange: Ensure that the flange faces the workpiece surface during installation. The flange is responsible for increasing the contact area and distributing pressure, and reversing it will negate this function.

3. Avoid overtightening: Over-tightening can damage the workpiece surface, especially on softer materials, and may also damage the threads.

4. Thread matching: Ensure that the nut and bolt have matching thread standards. Mismatched threads may prevent proper tightening or damage the threads.

5. Clean surface: Make sure the contact surface is clean and free of oil or debris before using a flange nut, to ensure proper tightening and anti-loosening performance.

6. Correct torque: Use the recommended torque values based on different materials and applications to tighten the flange nut, avoiding performance or safety issues caused by incorrect torque.

7. Material selection: Choose the appropriate material and corrosion treatment for the flange nut based on the working environment, avoiding the use of untreated nuts in wet or corrosive environments.

Following these precautions ensures safety, durability, and effectiveness when using flange nuts.

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