How can I purchase high-quality China Nut?

　　 1. Measure the outer diameter, the defective product is thin and short, obviously thinner than the national standard screw. Even more surprising is that the defective product does not even have a tension spring washer on the screw. Tension spring washers are mainly used for compression. The expansion screw of the tension spring washer is not easy to fix firmly.
　　
　　2. From the outside, the micro screw manufacturer introduced that the original screw has been treated with appearance, high gloss, and lubricated without sand holes. However, defective screws have rough processing, shallow threads, burrs, different screw angle widths, too shallow thread grooves, and uneven threads. If such a defective screw is used in furniture, it is very simple to slide or even break, which is basically a "disposable product".
　　
　　3. Check the certificate of origin of Bolt Factory's products. Since there are supporting manufacturers of export products, the requirements for production and quality are stricter, and the quality is guaranteed.