What is a Self Tapping Screw – How to Use Self Tapping Screw ?

What is a self tapping screw and which screws are the self-tapping screw?

Without further ado, look at the picture firstly, can you see the something in common on them?

Self tapping screws include self-tapping-A Screw(Self-Tapping Screw with Tip Point )and self-tapping-B screw (Self-Tapping Screw With Flat Point ). The screws in the picture above are Self Tapping Screw with Tip Point. The following are two screws, which are self-tapping screws with flat points, and the right also name THREAD CUTTING SCREWS.

So How to Use Self Tapping Screw ? Where it will be used?

General self tapping screw to use on the materials of low hardness, such as aluminum alloy, and the thickness of the material is not very thick, it is mainly used for some lamella piece connected with the fixed, such as Choi steel connection with Choi steel, color steel plate and purlin, wall beam connection and the thin metal plate (steel plates, plates, etc.) the connection between the and so on, its penetration is generally not more than 6 mm, maximum not more than 12 mm. Due to the self-tapping screw thread surface having high hardness (45 HRC) or higher, can attack by fitting the tap of the internal thread, forming a connection.

General use of screw diameter series, per inch length of thread count, and screw length three parameters to describe the self-tapping screw. The screw diameter series has 10 and 12 levels, and the corresponding screw diameters are 4.87mm and 5.43mm respectively. The number of threads per inch has 14, 16, and 24 levels, and the greater the number of threads per inch, the stronger the self-tapping ability.

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