Self Tapping Security Screws For Metal

This kind of Self Tapping Security Screws For Metal adopts an optimized drill tail structure. After vacuum heat treatment, the surface hardness can reach Rockwell hardness HRC 52 to 55 according to ASTM E18, so that it can still tap smoothly on structural steel up to six millimeters thick. At the same time, the required installation torque is controlled within 25 Nm, effectively avoiding overloading of power tools. The unique safety groove and special bit prevent disassembly with ordinary wrenches or screwdrivers, ensuring that outdoor facilities and public transportation equipment are protected from malicious loosening. It is especially suitable for guardrails, distribution boxes, rail fasteners and other places that are exposed to vibration environments for a long time.

In terms of anti-corrosion and anti-fatigue performance, the surface of the screw is covered with Dacromet coating. According to the neutral salt spray test according to GB/T 10125, it can withstand one thousand hours of non-substrate corrosion, which is nearly three times higher than ordinary oxidation treatment and significantly extends the maintenance cycle. At the same time, the thread root has been optimized with rounded corners, and its fatigue strength under dynamic load reaches 800 MPa according to the ISO 1099 test, which is enough to withstand wind pressure and the continuous impact of a passing train. These characteristics enable the screws to be installed conveniently in high-speed railway carriages, wind turbine towers and heavy machinery assemblies, while also providing long-term safety protection and significantly reducing the frequency of maintenance due to looseness or corrosion.

Obtain drawings from customers or create drawings based on their specifications or samples.

The drawings, product raw materials, surface treatment, and other details are attested to by both parties.

Provide a quote, confirm the order quantity, and include all relevant information.

Like the terms of payment, the terms of trade, the kind of packaging, etc.

When manufacturing the goods, adhere precisely to the original drawings and samples.

After a final inspection, it was meticulously packaged and delivered to the customers.

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