Speaking of round head Phillips screws, many people will think of pan head Phillips screws, because some people are used to calling pan heads round heads, and the cross grooves on the head of the screws are made by cross fine punching and punching. Its materials are mainly divided into carbon steel and stainless steel. There are three types of carbon steel, low-carbon steel, medium-carbon steel and high-carbon steel, and stainless steel has common materials such as 2o1/3o4/316. The electroplating colors are white nickel, black zinc, blue and white zinc, etc. So how to test whether the round head Phillips screws is qualified? It is mainly tested from the following four aspects:
1. At the beginning, it is necessary to detect the wire diameter of the screws wire and the material of the screws. Generally, the wire diameter of the screws is to use a caliper to measure the wire diameter and whether it is the same as the size we ordered.
2. After inspecting these, the next step is the inspection in the production process. Starting from the screws head, determine the size of the head, the opposite side of the head, the diagonal, the depth of the cross groove, the screws tolerance range, etc., these are all used Caliper to detect.
3. All aspects of testing during thread rolling are mainly whether the thread can pass the pass and stop gauge, and whether the screws thread can pass the pass and stop gauge.
4. Another aspect is the issue of electroplating. After the electroplating is completed, is it necessary to meet the requirements of the ring report and whether it takes the time required to pass the salt spray.
