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How to match bolts and nuts appropriately

2024-04-19

It is important to know how to match bolt with nut

Leaving three threads is of course an empirical value, and the manual generally requires a bolt diameter of 0.2 to 0.3.

1、 The reason for leaving three threads on the bolt

Bolt is a common fastener widely used in fields such as mechanical equipment, construction engineering, and automotive manufacturing. The retention of three threads in bolts is to ensure the tightening force and reliability of threaded connections. Specifically, the main reasons are as follows:

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

2. Adjust the length. Leaving three threads on the bolt can adjust the length of the bolt to expose a certain length of threads at both ends, making it easier to connect with the nut. This not only ensures sufficient contact area of the threads, but also avoids installation errors such as being too long or too short.

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

2、 The benefits of leaving three threads for bolts

Leaving three threads on a bolt can bring the following benefits:

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

2. Improve self-locking. Due to leaving three wires, the contact area can be increased to ensure the self-locking of the bolt.

3. Easy to install. Leaving three threads on the bolt can adjust the length of the bolt to ensure a tight connection between the bolt and the nut, without being too tight or loose.

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

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

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