Galvanized Self-Drilling Screws
/ 镀锌钻尾钉
Overview of Galvanized Self-Drilling Screws
01. Introduction to Yingfeng Carbon Steel Coated Self-Drilling Screws
These galvanized carbon steel self-drilling screws are manufactured from high-quality carbon steel grades such as 1022A and 10B21. Through carburizing heat treatment, they achieve a precise balance between hardness and toughness, while rigorous process control ensures “zero hydrogen embrittlement.”
Designed specifically for indoor steel structure applications where the fasteners remain unexposed to the elements, these screws feature a trivalent iridescent zinc electroplating finish with a coating thickness of at least 6μm. They withstand 200 hours of salt spray testing without showing red rust and offer a rust-resistance lifespan of over 10 years in suitable environments, providing a professional and reliable fastening solution for steel structures.
ADVANTAGES
Product Advantages of Galvanized Self-Drilling Screws
High-thickness coating; uniform, dense protective layer.
Utilizing an eco-friendly electro-galvanizing process, the zinc coating thickness ranges from 6 to 15 μm (compared to the industry standard of 2–5 μm), achieving 200 hours of salt spray resistance without red rust. Nano-sealing treatment results in a surface gloss exceeding 85 GU (versus <70 GU for standard galvanizing) and a 300% increase in wear resistance, delivering performance that comprehensively surpasses traditional processes.
Deep dehydrogenation process, fulfilling the promise of zero hydrogen embrittlement.
The galvanized screws undergo a vacuum stepped dehydrogenation process at 230°C ± 5°C (with an 8-hour holding time, extending the duration by 60% beyond industry standards). They have passed ISO 15330 hydrogen embrittlement certification testing, showing no fractures under a sustained load at 90% of their yield strength for 48 hours, effectively reducing the risk of hydrogen embrittlement to near zero.
High torsional strength prevents breakage, ensuring worry-free, efficient installation.
Crafted from premium C1022A low-carbon steel and subjected to vacuum hardening and low-temperature tempering, the fastener features a stable core hardness of HRC 35–42 and a surface hardness exceeding HRC 53. In drilling tests on 12mm-thick Q235 steel plate, it achieved a maximum driving torque of 45 N·m (surpassing the national standard of 30 N·m) with a thread-stripping rate of less than 0.1%, enabling efficient “single-pass” penetration and reducing construction time by 30%.
Eco-friendly, chromium-free passivation—ensuring a green and healthy choice.
Utilizing a chromium-free passivation process, the entire operation strictly prohibits the use of toxic substances such as hexavalent chromium, lead, and cadmium, resulting in no detectable heavy metal residues in the passivation film. The process meets EU RoHS certification and national environmental standards, ensures zero release of hazardous substances, and guarantees—at the source—a pollution-free construction environment and zero health risks for personnel.
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