What are the types of A2-70 bolts generally classified according to tooth profile? What are the differences between them? What are the different types of commission? Below, the Shanghai Yaluo editor will analyze the difference between coarse and fine teeth of A2-70 bolts based on data collection and practice.
1、 Ordinary threads can be divided into coarse and fine threads. The same nominal diameter can have multiple pitches, with the maximum pitch being called coarse thread and all pitches being fine thread. The so-called coarse thread refers to standard thread, which can be found in the national standards for threads. Generally, the screws and bolts that we can buy outside are coarse thread. Compared with fine thread, coarse thread has the characteristics of high strength and good interchangeability and is widely used. It should be regarded as the best choice. Fine thread is relative to coarse thread and there are standards available for reference, which can be found in the mechanical design manual. When designing, try to choose standard specifications as much as possible. Fine thread has small space occupation, good self-locking, and can be precisely adjusted in places that are not easily affected, such as fixing lenses for various optical instruments, using micrometers and other instruments for measuring purposes, and some threaded connectors that do not require the use of tools, such as oil cup covers, metal external light diode flashlight battery covers, etc. The pitch of the fine thread is small, and the height of the tooth profile is small. During installation, it is easy for the teeth to become tangled and unable to enter or exit, which greatly affects the assembly. It is necessary to clean it thoroughly. At the same time, the number of disassembly and assembly of fine thread should not be too many.
2、 The strength of coarse teeth is high, and the sealing of fine teeth is good. Fine thread and coarse thread screws are both used for fastening purposes. Fine thread screws are generally used to lock thin-walled parts and parts with high anti vibration requirements. Fine thread screws have good self-locking performance, so they have strong anti vibration and anti loosening ability. Due to the shallow depth of the thread, the tensile force is greater than that of coarse thread. The strength of fine thread is lower than that of standard thread (coarse thread). In fact, standard thread adopts the principle of equal strength, that is, the strength of the standard nut thickness size is the same as that of the screw. From the perspective of strength, this design is the most reasonable. So standard threads are the most widely used. But it also has a disadvantage, that is, its self-locking performance is relatively poor compared to fine thread, so spring washers or other self-locking devices need to be installed in places with severe vibration.
3、 A2-70 has different pitch sizes, with larger pitch for coarse teeth and smaller pitch for fine teeth;
1. The helix angle of fine teeth is smaller, which is more conducive to the self-locking of threads, so fine teeth are generally used in places where anti loosening is needed.
2. Fine thread has a small pitch, and with the same thread length, more threads can be screwed in, which can reduce fluid leakage. Therefore, it is used in situations where sealing is required.
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