Classification and Characteristics of Stainless Steel Self Drilling Screws

Stainless steel self drilling screws are divided into 304 stainless steel self drilling screws, 410 stainless steel self drilling screws, 316 stainless steel self drilling screws and so on.

A, 304 Stainless Steel Self Drilling Screws

304 stainless steel is austenitic stainless steel, which has the characteristics of non-magnetic under normal conditions and slightly magnetic after cold processing; At various temperatures, it can maintain its austenitic structure without phase transformation. So the hardening process cannot be carried out using heat treatment. Cold processing can be used to increase the strength while hardening. 304 stainless steel self drilling screw is characterized by no need for pre-drilling, it can directly penetrate aluminum-plastic board, plastic, plastic doors and windows, glass curtain wall and other materials, one time to complete the tapping & locking process. The advantages of 304 stainless steel self drilling screws are very obvious: time-saving, labor-saving, process-saving, and has good corrosion resistance; The disadvantage is that its mechanical properties are not high. Therefore, in the selection of application objects and scenarios, avoid using it to tighten the iron sheet. The iron sheet needs to use 410 stainless steel self drilling screws or composite bi-metal stainless steel self drilling screws.

304 Material composition table: C:0.08 Si: 1.00 Mn: 2.00 P: 0.045 S: 0.030 Ni: 8.00-10.5 Cr :18.00-19.00

B, 410 Stainless Steel Self Drilling Screws

410 stainless steel (i.e. 1Cr13) is a martensitic stainless steel; In contrast to austenitic stainless steel, it is magnetic; Therefore, the use of magnet to determine whether the purchased self drilling screw is stainless steel, this method is uncorrect. The main feature of 410 stainless steel self drilling screws is that the core hardness and surface hardness of self drilling screws can be improved by heat treatment, and its comprehensive mechanical properties are very high, but there is a lack of corrosion resistance compared with 304 and 302. Like 304 self drilling screws, 410 stainless steel self drilling screws do not need to be pre-drilled and can directly penetrate the iron plate, but its corrosion resistance is not high, so it is necessary to avoid use in perishable rust environments such as strong acid and humidity. If it is to be used, it must be under the premise of anti-rust treatment, such as metal surface treatment such as DACROMET or RUSPERT, otherwise it cannot be used directly.

410 Material composition table: C: 0.11 Si: 0.46 Mn: 0.45 P: 0.028 S: 0.002 Cr :11.95

C, Bi-Metal Self Drilling Screws

The composite Bi-Metal self drilling screws are made of composite metal, the screw locking part and the head are made of (18-8) austenitic stainless steel, the tapping part and the tip part of the tail are made of specially hardened metal, and the screw surface is specially treated to achieve the ultimate corrosion resistance. Therefore, when tapping into the iron sheet, the stainless steel part is introduced into the thread, which completely eliminates the phenomenon of locking caused by the wear and tear of the stainless steel tapping screws in the past, and achieves the complete conclusion, and retains the highest coefficient of pull out strength.

It does not require pre-drilling, can replace the existing traditional stainless steel tapping screws, the most suitable for a variety of wall material installation, construction. Due to its unique drilling tail design, it can be used in steel structure engineering. It can achieve the lightest load, the fastest drilling speed cutting effect, not only can reduce the user's work burden, but also in high-altitude operation or foothold difficult working environment to play its excellent effect. It has excellent rust resistance and high corrosion resistance life, making it ideal for a variety of demanding environments.