Can 4 inch self tapping screws be fully threaded or half threaded?

Screws are generally full thread or half-threaded. But can the longer screws be made full thread or half threaded? For example, can 4 inch self tapping screws do it?

The 4 inch self tapping screws are fully threaded. This screw manufacturer is required to have a large thread rolling machine (use two plate-shaped tools with inclined teeth to make the opposite movements and squeeze the workpiece to form a thread on the surface of the workpiece.) that can make the thread of the screw into a full thread. If the screw manufacturer does not have such a thread rolling machine, then the screw can also be rolling thread (use two threaded sticks to squeeze the machined part so that the part surface is pressed out of the thread) to the root, so that it can be made full-threaded, but in doing so, the cost of the screw will be more expensive.

If the 4 inch self tapping screws are made of half thread, basically all the screw manufacturers can do it. The only difference is the length of this thread. However, if the screw is made into a half thread, it is generally necessary to pay attention to the diameter of the rod where there is no thread. If the diameter of the rod is smaller than the diameter of the thread, it is generally not necessary to open the mold; if the diameter of the rod is If the diameter of the thread is the same, it is generally required to open the mold.

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