Screw fasteners have brought us a convenient life and are an indispensable work piece in our lives. It is an indispensable necessity in any era.

First, let's take a look at the appearance characteristics of flat head screws and countersunk screws:

We can see that the shape of the flat head screw and the countersunk head screw are different, and the connection between the head of the flat head screw and the screw is connected at a 90 degree angle. For a countersunk Micro screw, it extends from the head of the screw to the screw in a conical manner. There is a difference in appearance between flat head screws and countersunk screws.

Secondly, let's take a look at the purpose of the flat head screw and countersunk screw shape design.

Most of the functions of screw fasteners are used for connection and fastening. We first install the two screws (as shown in the figure below), we will find that the head of the flat head screw is in a protruding state, and the head of the entire flat head screw is exposed, which makes it feel strange to the touch. After the countersunk screw is installed, we will find that almost all the screws are cut into the product. The head of the countersunk screw is flat on the surface of the product, and it feels no different to the touch. Many product shell screws will use countersunk screws as fastening, because they feel better and look more beautiful.

The force of flat head screws and countersunk head screws. Due to the difference in the shape of the two screws, the degree of force between the two is also different. Generally speaking, the force of the flat head screw is greater than that of the countersunk screw. Especially when the countersunk head screw is screwed into the object, it is more obvious.

In the use of flat head screws, we can add flat washers and spring washers according to the actual use, because the head of the flat head screw and the bolt connection part are at a 90 degree angle, which is more convenient to use. However, due to the limited shape of the head screw, it can only be added with a tapered washer.

In the screw fastener industry, countersunk screws are also called flat head screws. The heads of both are flat, and the shape is not too obvious, and sometimes they are not distinguished so fine. The main is to choose whether to produce flat head screws or countersunk head screws according to the use of screw fasteners.