1. The advantages of qualified non-standard screws are good insulation performance, non-conductive, wide range of application.

2. Compared with the three large parts, the non-standard screws used in industry are very few, but because the machine is assembled with non-standard screws, it can not be short.

3. Non-standard screw has good acid and alkaline resistance. Due to small drilling and large tension, it can be disassembled at will when not in use and has good mechanical properties.

4. There are two kinds of flat-head screwdriver and flat-head screwdriver for handling non-standard screws, which are convenient and labor-saving. In the industry, qualified, high quality non-standard screws play an important role.