1. Surface: Look at whether the surface material of the product is flat. If scratches and deformations are seen, it is produced with scrap (cutting material). The appearance of this hinge is ugly, which makes your furniture have no grade.
2. hydraulic performance: Everyone knows that the hinge is a function of a switch, so this is very important, the key is to take the damper of the hydraulic hinge, as well as the rivet assembly. The damper mainly depends on whether there is noise when opening and closing, if there is noise, it is inferior product, and whether the speed of the round is uniform. Is the hinge cup loose? If there is looseness, the rivet is not tightly riveted and it is easy to fall off. Closed several times to see the indentation in the cup is not obvious. If it is obvious, it proves that there is a problem with the thickness of the cup, which is easy to "explode".
3. screws: the general hinge comes with two screws, are all adjustment screws, up and down adjustment screws, front and rear adjustment screws, some new hinges also have left and right adjustment screws, which is now called three-dimensional adjustment hinges, generally with two adjustments The station is full. Tips, use a screwdriver to adjust the upper and lower adjustment screws three to four times, then take the screws down and see if the hinge arm's teeth are damaged, because the hinge arm is made of iron material, so hard without screws. It is easy to wear, and it is easy to slip or not move if the precision is not enough when the factory taps.