Light steel structure is a young and vital steel structure system. It has been widely used in general industrial, agricultural, commercial, and service buildings. It has also been used in adding floors, transforming, and reinforcing old buildings, and in areas lacking building materials and in areas with inconvenient transportation. The tight construction schedule and the movable and removable buildings are highly favored by the owners. An indispensable material for us when building these light steel structures is drill-tailed self-tapping screws. So how much do you know about self-tapping screws?

“Self-drilling screws” are also called “drilling screws”, “drilling screws”, “self-drilling screws”, also called “dovetail screws”, English: SELF DRILLING SCREWS. Its implementation standards include the national standard GB/T 15856.1-2002, the German standard DIN7504N-1995, and the Japanese standard JIS B 1124-2003.

This kind of screw has a drill tail tip, which is named after the tip resembles a twist drill. During assembly, the screw can drill out the center hole by itself, and then use the adjacent threaded part to self-tapping and extruding the matching screw in the hole on the carrier. Thread, so it is called self-drilling and tapping screws.

According to the implementation standards, drill tail screws can be divided into: national standard GB/T, German standard DIN, Japanese standard JIS, and international standard ISO.

It can also be divided into the following categories according to use and shape:

1. Cross recessed pan head self-drilling and tapping screws. Cross recessed pan head drilling screws with tapping screw thread Implementation standard: GB/T 15856.1-2002 has the following specifications: (also called round head drill tail).

2. Cross recessed countersunk head self-drilling and tapping screws. Cross recessed countersunk head drilling screws with tapping screw thread Implementation standard: GB/T 15856.2-2002 has the following specifications: (also known as flat head drill tail, salad head drill tail).

3. Hexagon flange head drilling screws with tapping screw thread. Implementation standard: GB/T 15856.4-2002. It has the following specifications: (also called hexagonal Dahua drill tail, which is one of the drill tail screws. The most commonly used and largest specification.)

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4. Hexagon washer head drilling screws with tapping screw thread. Implementation standard: GB/T 15856.5-2002. It has the following specifications: (also called hexagonal small washer drill tail.)

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