Can someone please explain the concept of residual torque?

[patpat2025]

Hey everyone, can someone help me understand residual torque and its impact on the performance and reliability of a fastened joint? I know it’s the torque left after tightening, but how does it affect joint integrity and durability? Any insights or examples would be great!

 

[datamyteblog]

Oh, good question! Residual torque is the torque left in a fastener after it's been tightened. It matters because too little can cause loosening over time, while too much can lead to stress or even bolt failure. A common example is in car engines—if the bolts aren’t at the right residual torque, it can cause leaks or mechanical issues. That’s why checking torque specs is so important!