Although the Micro screw is small, it is of great significance. In fact, the informal name is also called "special screw". Because of its extensive use in industry, it is called "the rice of industry". Daily life is inseparable from it. Ordinary people have roughly counted the decorations in their homes. In a home of more than 110 square meters, there are as many as 886 screws of various types used in doors and windows, furniture, pipelines, and home appliances. As far as general home decoration is concerned, the total price of the screws that may be used will not exceed 1,000 yuan. But this is a small thing of less than a thousand yuan, and its quality cannot be ignored. For many years, due to the simple screw, nut, production technology and low market entry threshold, screw manufacturers have fallen into low-level competition, and the market is full of inferior special screws that do not meet the national quality standards. inferior. Among them, the inferior products are easy to fall off during the moving process due to the shallow thread on the furniture. There are also some non-standard screws used in pipelines, because the anti-rust treatment is not enough, they will rot in a short time and cause water leakage. The fake and inferior expansion screws used on the chandelier are even more dangerous. Once the load-bearing strength is insufficient, it is easy to cause heavy objects to fall and cause injuries.

So how can we purchase high-quality special screws?

1. Measure the outer diameter, the inferior products are thin and short, obviously thinner than the national standard qualified screws. What's even more surprising is that the inferior products don't even have spring washers on the screws. The spring washer mainly acts as a pressure, and it is not easy to fix it without the expansion screw of the spring washer.

2. Looking at the appearance, the screws are surface-treated, with high gloss, and the interface is smooth without blisters. On the other hand, inferior screws have rough craftsmanship, shallow threads, many burrs, different screw angle widths, shallow thread grooves, and uneven threads. If such inferior screws are used on furniture, it is easy to slip or even break. Sexual Products".

3. Check the certificate of origin of the product.