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​The difference between self tapping screws and drill tail screws


Self tapping screws do not refer to just one kind of screws. There are many self-tapping screws in the series. Their respective characteristics and applications are different. The following is a brief introduction to two easily confused screws - self-tapping screws and drill-tail screws. .

What are self tapping screws? What are drill tail screws?

A self-tapping screw is a threaded fastener that taps out the matching female thread in a pre-drilled hole in a metal or non-metal material. Self-tapping screws do not require a nut with female threads. They drill the female threads into the material when they are screwed in. Self-tapping screws such as triangular thread self-tapping screws, high and low pressure self-tapping screws, etc. are all self-tapping screws.

A drill screw is a type of wood screw. A drill screw is a screw with a self-tapping drill bit at the front end of the screw. It is also called a self-drilling screw. According to the different drill tails, it can be divided into: round head rice/cross/plum blossom, countersunk head (flat head)/rice/cross/plum blossom, hexagonal washer, round head washer (large flat head), trumpet head, etc.

In fact, the two are closely related. "Self-drilling screws" must be "self-tapping self-drilling screws", referred to as "self-drilling screws". Because they have a drill tail, they are also called "drilling tail screws", and self-tapping screws It is not necessarily a self-tapping self-drilling screw. Usually, the self-tapping screws we refer to refer to self-tapping screws that require pre-made holes.

What do self-tapping screws and drill screws have in common?

The nail body is threaded and can be self-tapping.

The difference between self-tapping screws and drill tail screws

1. Differences in use: Self-tapping screws are used on non-metallic or soft metals (such as color steel plates) and other materials with low hardness. They can be used on the fixed material and rely on their own threads to be The fixed body "drills, squeezes, presses, and taps" corresponding threads to make them closely match each other. Drill tail screws are mainly used for fixing color steel tiles and thin plates of steel structures.

2. Difference in usage: When self tapping screws are screwed in, corresponding internal threads are formed by extrusion. There is no need to drill or tap holes, and the operation can be completed in one go. However, it is not recommended to drill multiple times, as it may easily damage the drilled hole or cause slippage. When using drill tail screws, no auxiliary processing is required. Drilling, tapping, locking and other operations can be completed directly on the material in one go, greatly saving installation time.

3. Differences in appearance: Self tapping screws are generally pointed, coarse-threaded, hard in texture, and have a certain taper, so that they can "self-tapping", but they cannot drill holes, and the head of the thread of the tail screw cannot be drilled. There is a drill bit that can drill holes.

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