First: Guaranteed elasticity The screws used in the car will be used with the spring washer, its most basic requirements are to have a good elasticity, and the size should be appropriate, so that when the screws appear loose, you can use the friction between the screws and the spring to slow down the degree and impact of loosening. Spring Washer Although the price is relatively cheap, but its role is very huge, especially in automobile manufacturing above is an essential part. Its good elastic deformation ability is to ensure that the screws will not easily loosen the precondition, so before installing the screws and spring washer to check whether the screw thread is intact, but also to check whether the paralysis washer's elastic denaturation performance is effective.
Second: Use of open pins The use of open pins is also to prevent car screws loose or even slip, but not all car screws can use the opening pin, generally in the engine part of the big head screws using the opening pin of the situation notes oh much. Open pin in the use of the need to choose the appropriate length, because the car in the process of driving the engine is in a state of high-speed operation, the opening pin length is too long will collide with the crank arm, and then will be scraped, this situation if not found in time, it will not be long before the opening of the sale of the whole slip, Therefore, the screws are also lost protection, over time will occur loose. Therefore, when the opening pin is used, on the one hand, the length can not exceed the width of the screw too much, on the other hand must be plugged into the screw overhead hole inside, and to use the tool to secure it. This ensures that the screws are unlikely to loosen even at high speeds.