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The function of the combined screw: it has perfect ability to fasten the crimping line. It is a supporting high and low voltage contact, high and low voltage air conditioning wiring, and the current and voltage of electrical appliances, power, frequency, and performance are significantly improved. Compared with the traditional separation screw, it can save people, labor, and time.
1、 It depends on the requirements for the material of the screw, that is, the combination screw that needs the data, such as stainless steel or iron.
2、 Depending on the requirements for the national specification number of combination screws, the common specifications are gb9074.8, gb9074.4, gb9074.13, etc.
3、 It depends on the strength requirements of the mechanical properties of the combination screw, such as whether the grade is 4.8 or 8.8, and whether the screw needs to be hardened.
4、 After all, it should be noted that there are many types of combination screws, such as three combination screws, external hexagonal combination screws, cross pan head combination screws, internal hexagonal combination screws, stainless steel combination screws, high-strength combination screws, etc. for example, iron combination screws need electroplating. Stainless steel combination screws are not required.
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