How to identify the quality of long screws?

This issue of quality has always been a concern of many people. It is also very important for small screws. Screws are used in many fields. There are screws in almost all the computers, mobile phones and household appliances we come into contact with in our daily production. Long screws are more commonly used in batteries, selfie sticks, chandeliers, solar panels, and so on. Small accessory concerns the use risk of the product. So how do we know its mass?

When we receive the long screws, we first see if there is any defect in its appearance. If the surface of the screw has been treated, it is necessary to see whether the electroplating is also defective and whether the electroplating is easy to fall off.

Then, we need to check whether the strength of this long screw is up to the requirement. Test the torque of a screw using a torque tester or other instrument to check the torque. If the screw breaks when the torque is not within the standard torque range, you need to ask the screw manufacturer why this problem occurs and if it can be solved.

In the back, it is necessary to measure the function of the long screws, whether it can be screwed in, whether there is sliding teeth, sliding batch and other conditions.