M1.4 carbon steel hardened thin head black zinc plated screw

Industry knowledge：

Do you know the difference between pan head screw and round head screw?

1. The difference between pan head screw and round head screw is that they are different in appearance. Of course, it mainly refers to the head type of screw. The head of round head screw is round and the side looks semicircular, while the head of pan head screw is round and the side looks trapezoidal.