Introduction of self-drilling screws

Self-drilling screws are a new technology that has emerged in recent years. Spiral is a commonly used term in fasteners and everyday spoken language.

Self-drilling screw" is also known as "drilling screw", "drilling screw", "self-drilling screw", and northerners are also known as "dovetail screw", English: SELFDRILLINGSCREWS. Its implementation standard is GB/T15856. 1-2002, German standard DIN7504N-1995, Japanese standard JISB1124-2003.

This screw has the same drill tip as a twist drill. It can automatically drill the center hole during assembly, and then self-tapping and squeeze the thread in the hole on the bracket with the help of the part close to the thread, so it is called a self-drilling and self-tapping screw.

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

The tail of the drilling screw is in the shape of drilling or drilling, no auxiliary processing is required, and it can be directly drilled, tapped and locked on the base material, which greatly saves construction time. Compared with ordinary screws, its toughness and retention are high, and it will not loosen after a long time after being combined. The stable tapping can be completed at one time, and the operation is simple.

Application: It is a kind of screw, which is mainly used for the steel fixing of color steel tiles, and it can also be used for the fixing of thin plates in simple buildings. It shall not be used to fix the combination of metal and metal.

Material and model.

There are two kinds of materials: iron and stainless steel. Stainless steel is divided into various materials.

Its model is: Φ4.2/Φ4.8/Φ5.5/Φ6.3mm, and its specific length can be determined according to user requirements.

According to the different drill bits, it can be divided into:

Round head/Cross/Plum, countersunk/flat/Yonzi/Cross/Plum, hexagon washer, round head/Plum (large flat head), trumpet, etc.

According to the material, it can be divided into:

Steel 1022A, 410 stainless steel 410, stainless steel 304.

Carbon steel self-drilling screw, 1022A, is used as a material for the production of self-drilling screws. The surface hardness is HV560-750 after heat treatment, and the core hardness is HV240-450. The general surface treatment is easy to rust, has high hardness and low price.

Stainless steel self-drilling screws, 410, can be heat treated, and the rust resistance is worse than carbon steel, not as good as stainless steel 304.

Stainless steel self-drilling screws, 304, can not be heat treated, corrosion-resistant, low hardness, high price, can only drill aluminum, wood, and rubber.

4. The drill bit is made of carbon steel, the thread and the drill bit are made of 304 stainless steel composite self-drilling screws.

Special recommendation: 410 stainless steel.

Scope of application: generally used for fastening connections of aluminum profiles, wood products, thin-walled steel pipes, steel plates and non-metallic materials, and directly tapped with screws.

Advantages: It has high corrosion resistance (1500 hours salt spray time), no hydrogen embrittlement, excellent high temperature resistance, and excellent weather resistance.