The bolts and nuts used in automobiles serve to join various components. To ensure that these parts maintain adequate preload, they must not be overtightened during installation. If tightened excessively, external connecting parts can easily undergo permanent deformation when subjected to external forces; furthermore, the bolts themselves may suffer from excessive stretching and deformation during operation, potentially leading to stripped threads or even breakage. For instance, regarding an automobile's knock sensor: if the mounting screw is overtightened, the sensor becomes overly sensitive-which can adversely affect engine acceleration-whereas if it is too loose, signal detection becomes unreliable.
Therefore, when it comes to the bolts used in automobiles, tighter is not necessarily better. These bolts and nuts secure a multitude of components; to ensure that they maintain the requisite preload, it is imperative to avoid overtightening them. Excessive tightening risks causing permanent deformation in external connecting parts under the influence of external forces, thereby leading to stripped threads or breakage, and ultimately compromising the vehicle's service life.
