Are thin-headed screws easy to break?

As we all know, there are many types of #screw head types, such as flat head, pan head, cylindrical head, hexagonal head, #countersunk head, and other head types. When purchasing screws, some customers will require a thinner screw head when choosing the so-called "thin-head screw," but in the process of use, the thin-head screw is easy to break if it is misused. Let's take a look at the following two pictures together, and everyone will understand:

If the head of the screw is too thin, the depth of the head is less than the depth of the groove, and then the slot hole will hit the screw. There will be this phenomenon in Figure 1. Once the screw slot hole is punched into the screw, a vacuum appears where the rod part is connected to the head, and the force capacity of this part will be weakened, which will lead to the possibility of screw breakage.

For the same model of cross groove, hit the head in the normal range of the flat head. Then after the sudden fire hardening treatment, the screw strength is improved, as long as the customer's torque is not greater than the torque value of the screw itself so that the screw will not appear broken phenomenon, just like in Figure 2.

Therefore, when customizing thin-headed screws, we still have to #consider the optimization scheme according to the use scenario.