How does long allen screws calculate length?

For those who are not familiar with screws, when calculating the length of long allen screws, some people calculate the length of the whole screw into the length of the screw, is this right? If I’m wrong, how do I do that?

That’s right and that’s not right. When the head shape of a long allen screws is countersunk, the length of the screw is calculated as the length of the whole screw. However, if the head shape of the screw is not countersunk head, then the length of the screw only counts under the head, and the length of the screw does not include the head.

Then, when the screw is a half thread, how to calculate the length? The length of a screw with half thread is not calculated as the length of the thread. The length is calculated according to the length without the head, that is, the length below the head. Is the shoulder screw also calculated in this way? Actually, yes. Although some people prefer to calculate the length of the shoulder screw separately from the length of the shoulder screw, the length is the length of the thread. But the actual length of the shoulder screw is calculated from below the head.

The basis of the above length calculation is the long allen screws, without the head is basically calculated the full length, of course, also not necessarily. If you want to know more about screws or want to customize screws, please contact us.

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