How many kinds of self tapping screws fastenal have?

What are the categories of self tapping screws fastenal? It is divided into A-type thread, B-type thread ,type AB, if you see it only through the shape of the thread. So what’s the difference between the three? How to distinguish screws A, B and AB?

A thread are self-tapping screws with a pointed tail and has a large pitch; B type are self tapping screws fastenal with flat tail , they are used in metals. Such as 0. 050 to 0. 200 thickness. AB thread are made of pointed tail screws according to the number of thread of the standard B thread .

In addition, it is noteworthy that A thread can be larger than the screw specifications between 0.03 and 0.04, while AB thread can not be larger than the screw specifications.

Check the photo, you can see the appearance difference of different types of self tapping screws fastenal more intuitively.

If classified according to material, it can also be divided into stainless steel tapping screws, carbon steel tapping screws, copper tapping screws, aluminum tapping screws and titanium tapping screws and so on.

More knowledge of self tapping screws fastenal, keep watching Shi Shi Tong screws.