China Nut ( https://www.chinaweigao.com/ ) is very useful, its fastening effect is very good, but it is inevitable that there will be loosening problems during use, why does the hexagon socket bolt appear loose? How to reduce the looseness?

　　 There are many reasons for the loosening of hexagon socket bolts, the more common ones are: insufficient tightening, vibration, fatigue, etc. Here is a brief introduction.

　　 1. Insufficient tightening

When tightening the hexagon socket bolts, if the pre-tightening force is insufficient, it will lead to insufficient tightening or false tightening. In this way, after a period of use, the joints of the bolts do not have sufficient pre-tightening force, causing the bolts to suffer from All aspects of the stress and loose.

　　2, vibration

When the hexagon socket bolt is in a vibrating environment, there will be many small "lateral" movements, which will cause repeated movements of the bolt connection part. These movements will offset the friction between the bolt and the connection, resulting in The bolt threads are loosened.

　　 In addition, fatigue is also a common cause of loosening of hexagon socket bolts, because the pre-tightening force is greatly reduced, causing deformation or permanent damage to the threaded part of the bolt.

How to reduce the loosening of hexagon socket bolts? In order to avoid spontaneous loosening of bolts, we need to eliminate or reduce the sliding between the connecting parts. This can increase the axial tension, increase the friction of the clamping parts and reduce the vibration and impact. Wait for the situation to improve.

　　 In addition, weigao Bolt Factory ( https://www.chinaweigao.com/product/bolt/ ) suggests that you can also increase the thread friction of the hexagon socket bolts to reduce the loosening problem. For example, you can use glue to increase the thread friction, but it will be more difficult to remove the bolts in the future.