| Fasteners are fastened and widely used for a class of mechanical parts. A wide range of fasteners can be found in a variety of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, instruments and supplies. It is characterized by a variety of different specifications and performance of different uses and standardization, serialization, generalization of the species is also very high. Therefore, some people have the national standard of a class of fasteners known as the standard fasteners or referred to as standard parts. |
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