Everyone is not unfamiliar with self-tapping screws. Have you ever experienced screws loosening when using stainless steel self-tapping screws? Next, the self-tapping screws manufacturer Hangzhou Lizhan Hardware Co., Ltd. will analyze several reasons for the self-tapping screws.
1. The thickness of the fastened component is greater than the thickness of the head of the countersunk head tapping screws, so that after the screws is screwsed, some threads will not be screwsed into the screws hole, and the screws does not fit well with the workpiece, so the screws will not be screwsed. tight.
2. Contrary to the above situation, if the thickness of the fastened part is less than the thickness of the head of the countersunk head tapping screws, it will not work. solid. Because when the thickness of the component is small, the screws may form a conical shape after passing through. When the screws is tightened, it is not the head of the screws and the tapered surface that are pressed, but the bottom of the screws head and the top of the screws hole are pressed to Relatively fixed, in this case you will feel as if the screws are tightened, but in fact they are not.
3. The wrong angle of the countersunk hole on the workpiece will also cause the countersunk self-tapping screws to be unable to be tightened. The self-tapping screws we produce generally has a cone angle of 90 degrees, but the top angle of some drills is 120 degrees, so the After the screws is tightened, the conical head will not receive force, but the bottom of the screws head is under force, so it will not be able to be tightened.
