What to do if the long nut’s anti-loosening measures fail?

Under conditions of vibration or frequent load fluctuations, long nut connections may gradually loosen, a common risk in long nut applications.

long nut’s anti-loosening measures fai Solution:

Adding anti-loosening devices: According to design requirements, adding anti-loosening measures such as spring washers, double nuts, lock nuts, or thread lockers to the long nut can effectively improve the reliability of the long nut connection.

Spot welding: For non-disassembly connection points, spot welds can be performed on the ends of the long nut and the screw. This method can permanently prevent loosening, but the potential impact of welding on the long nut’s material properties should be taken into consideration.

Corrosion Issues with Long Nuts

Symptoms: In humid and corrosive environments, the contact surface between the long nut and the screw thread is prone to electrochemical corrosion, causing the long nut to seize or weaken, directly affecting its service life.
Solution:
Material Matching and Protection: Choosing the appropriate long nut material for the corrosive environment, such as stainless steel or hot-dip galvanized long nuts, is a fundamental solution. Professional Surface Treatment: Surface treatments such as Dacromet and galvanizing are used on long nuts to significantly enhance their corrosion resistance.
Apply a lubricant and anti-corrosion agent: Before installation, apply a special lubricant and anti-corrosion agent to the threads of the long nuts. This not only prevents rust but also aids tightening.