M2 refers to one of the size standards of screws, which can also be called 2mm screws. M2 screw is a very fine screw specification, which is usually used in the fields of electronic equipment and precision instruments. Because M2 screws are very small, special tools or skills are needed to install and adjust them.

M2 screw consists of thread size, thread spacing and thread type. M2 has a thread size of 2mm and a thread spacing of 0.4mm. There are two types of threads, namely, periodic threads and multi-strand threads. Since the size standard of M2 screws is actually quite small, they need to be handled with great care to ensure the correct size and function.

M2 screws are widely used, and are usually used in some applications that require high precision. For example, they can be used to connect circuit boards or chips in electronic equipment and to assemble high-precision instruments. In a word, the size and specification of M2 screw are of great significance, which is directly related to the quality and reliability of products.