1. It is necessary to look at the color of the non-standard custom screws. If the surface has poor electroplating such as whitening, blackening, and contamination, it is necessary to report to the manufacturer and let them provide good non-standard screws;

2. If the head of the non-standard custom screw has no burrs and cracks, it is good;

3. Because non-standard screws will affect the tightening effect, it is necessary to see if there is a crack in the connection place, and if so, it needs to be replaced immediately.

Good non-standard screws are widely used in electrical products, precision machines, toy plastics, etc. They are of good material, high strength, small and uniform pitch, and are generally used to fasten metal and machine parts.

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