1. Visual Inspection: Check the thread condition. Carefully inspect the screw threads for obvious wear, deformation, missing threads, or irregularities. If the threads become blurred, partially broken, or show "bald heads," it can generally be determined that the screw is stripped. For thread damage inside pre-drilled holes, a magnifying glass or endoscope can be used for further inspection.
2. Tactile Inspection: Sensing Tightening Resistance. During the tightening process, if it feels unusually easy, lacks normal meshing resistance, or repeatedly turns without tightening, it is very likely a sign of stripping. Experienced operators can keenly detect abnormalities by touch, but individual differences should be noted.
3. Comparison Method: Compare with a Normal Screw. Compare the suspected stripped screw side by side with a new screw of the same specification, observing the clarity and integrity of the threads. If the old screw's threads are significantly worn and the height is reduced, stripping can be confirmed. This method requires a reference object for support.
4. Torque Verification: Use a torque tool to test. Set the standard torque value using a torque screwdriver or electric screwdriver. If the screw slips before reaching the set value, or if it becomes noticeably loose after tightening, the connection has failed, possibly due to stripped threads.
5. Fit Inspection: Check if the screw and the substrate are loose, misaligned, or fail to fit properly. If gaps or wobbling remain after tightening, even if there is no visible damage, there may be hidden stripping.
