1: Select the right size, slightly larger or smaller screws, you may be able to use the moment, but in the long run, it will be loose or locked.
2: friction prevention. Keep the frictional resistance between the threads to prevent loosening, such as spring washers, double nuts on top, etc.
3: Mechanical locking. The use of stop parts to prevent the relative rotation between the thread, such as grooved nuts and split pins.
4: Destruction of thread locks. Destroy and change the threading relationship, such as the impact method. !
5: Direct use of flange bolts, nuts
6: smear fastening agent, screw glue, etc.