Bolts are the most used parts in a car, and many auto mechanics jokingly refer to themselves as "internal screws." If you look closely at the content bolts, you will find that the bolts come in various shapes and have different numbers on the bolts. What does all this mean? Today we will discuss the knowledge bolts of the car.
According to the direction of rotation of the thread: There are two types: left-hand thread and right-hand thread. The vast majority of threads are right-hand threads, and a few special parts use left-hand threads.
According to the number of threads, it can be divided into single thread, double thread and three thread, among which single thread is mainly used for connection, and other threads are mainly used for transmission.
According to the shape of the thread, it is divided into triangular thread, rectangular thread, trapezoidal thread and zigzag thread. Among them, the triangular thread has good self-locking performance, and the thread teeth have high strength. They are commonly used for connections and use the widest range of threads.
According to the pitch, it can be divided into two categories: coarse tooth and fine tooth. Coarse-toothed thread is the basic thread, and fine-toothed thread has high screw strength, but the strength of thread teeth is lower than that of coarse-toothed thread, which is usually used for thin-walled pipe fittings, shaft parts and adjustment parts of precision mechanisms. When the screw diameter is greater than 70mm, only fine-tooth threads can be used.
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