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 screw 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 screw 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 screw wire and the material of the screw. Generally, the wire diameter of the screw 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 screw head, determine the size of the head, the opposite side of the head, the diagonal, the depth of the cross groove, the screw 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 screw 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.
