Custom carbon steel cross drive black shoulder case screw

Industry knowledge：

What are the methods to prevent screws from loosening?

1. Special engineering plastics are processed on the thread, so that when the screw is pressed, it will produce strong friction torque and reaction force, produce contact on the surface of the full thread, and provide absolute resistance to vibration.
2. Anti loosening method for increasing friction. Spring washers and double nuts can also be installed. The pressure between the tightened threads will not be lost due to the change of external force, so there is always frictional resistance to prevent the connection from loosening.