Why Should Three Wires Be Left After the Bolts Are Tightened?

Leaving three threads is of course an empirical value. The manual generally indicates a bolt diameter of 0.2 to 0.3.

The reason why three threads are left on the bolts

Bolts are common fasteners that are widely used in mechanical equipment, construction engineering, automobile manufacturing and other fields. The purpose of leaving three threads on the bolt is to ensure the tightening force and reliability of the threaded connection. Specifically, the main reasons are as follows:

1. Increase the contact area. Leaving three threads on the bolt can increase the contact area between the bolt and the nut, thereby improving the tightening force and self-locking properties.

2.Adjust the length. Leaving three threads on the bolt can adjust the length of the bolt so that the threads at both ends are exposed to a certain length to facilitate connection with the nut. This not only ensures that the thread contact area is sufficient, but also avoids installation errors such as being too long or too short.

3. Avoid burrs. Leaving three wires can also avoid burrs generated during thread processing and other adverse effects on the tightening force of bolts and nuts.

The benefits of leaving three threads on bolts

Leaving three threads on the bolts can bring the following benefits:

1. Improve fastening force. Leaving three threads on the bolt can completely embed the thread into the nut, increase the contact area and strengthen the tightening force.

2. Improve self-locking properties. Leaving three wires can increase the contact area, thereby ensuring the self-locking properties of the bolt.

3. Easy to install. Leaving three wires on the bolt can adjust the length of the bolt so that the bolt and nut are tightly connected without being too tight or too loose.

4. Reduce the risk of loosening. Leaving three threads on the bolts can reduce vibration and loosening during threaded connections and improve the reliability of the connection.

5. Reduce installation time. Leaving three wires can reduce installation time and improve production efficiency.

In short, leaving three wires on bolts is a common fastening method and plays an important role in mechanical engineering. Leaving three wires can not only improve the tightening force of the connection, but also improve the self-locking and reliability, avoid installation errors caused by being too tight or too loose, and improve production efficiency and work safety.