Is there any head type restriction for long black screws?

Anyone who knows about screws knows that there are many types of screw heads, such as pan head, round head, large flat head, countersunk head, flat head, cylindrical head, PF head, button head, and so on. So when the length of the screw becomes much longer, are there any restrictions on the shape of the head of the long black screws?

Among the long black screws that we often see, the head shape that we often see is the outer hexagon, the outer hexagon recess, and the cup head. For other head types that are rarely seen, are there really restrictions? Actually it is not. Even if the length of the screw becomes longer, there is no limit to the shape of the head. As long as you want which type of head, as long as the reasonable coefficient of wire forming can be produced.

The reason why we rarely see long black screws with other head shapes is mainly that the customer’s demand is more for the external hexagon head and the cup head internal hexagon head. It is also possible that the customer does not know that such a long screw can also be used for other Head-shaped. The specific head type is determined by the customer, not by the manufacturer.