How are extra long m4 screws made?

Compared with the standard screw, the length of 304 stainless steel screws is much longer, so how is such an extra long m4 screws made?

Compared with standard screws, the production equipment of long stainless steel screws is different. The production of standard screws is generally made by single mold machine, while the production of extra long m4 screws is generally made by closing mold machine, because such a long length has exceeded the production range of single mold machine. It is sometimes possible to use a multi-station machine for production, but the length of the screw is limited.

When using the closing machine for production, it is generally necessary to first calculate the length of the material to be cut, and then cut, and then put the cut wire into the debugging of the closing machine, the shape of the screw, the rod, the general shape of the tail out, and then the thread rolling.

Because the length of the screw that can be put into the thread rolling is limited, so extra long m4 screws in the time of the thread rolling, if the length is very long, it is not possible to put the machine to make the machine automatically rolling thread. So we need to manually put in the place where the thread rub, a screw thread to rub out.

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