The front end of Galvanized Self Drilling Screws features a specially designed drill bit that can easily penetrate thin steel plates, corrugated steel sheets, aluminum profiles, and non-ferrous metals. The threaded tail provides high clamping force. The surface is typically treated with cold galvanizing or hot-dip galvanizing to provide basic to good rust protection.
Product Parameters
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Common specifications |
ST4.2, ST4.8, ST5.5, ST6.3 (corresponding to metric threads) |
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Applicable substrate thickness |
Commonly found in metal sheets ranging from 0.8mm to 5.0mm in thickness. |
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Material and hardness |
Carbon steel (such as 1022A); drill bit hardness ≥ HRC 50 |
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Surface treatment |
Commercial electro-galvanizing (blue-white zinc/color zinc) or hot-dip galvanizing (zinc layer ≥45μm) |
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Corrosion resistance testing |
Commercial galvanizing: ≥72 hours of neutral salt spray without white rust; Hot-dip galvanizing: ≥240 hours |
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Drive slot type |
Phillips head (PH2), Pozi head (PZ3), or hexagonal washer head |
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Packaging requirements |
Rust-preventive inner packaging (such as VCI bags), with specifications and plating clearly marked on the outer carton. |
Product Features
All-in-One Design
Galvanized self-drilling screws feature an integrated drill point that performs drilling, tapping, and fastening in one step, significantly boosting installation efficiency.
Excellent drilling performance
They are engineered to effortlessly penetrate materials like thin steel plate, aluminum, wood, and PVC, ensuring quick and smooth installation.
Robust Connection
The screws' precision-formed threads provide high pull-out resistance and excellent vibration resistance for a secure, long-lasting hold.
Enhanced Corrosion Protection
Their zinc-plated finish offers reliable resistance against rust and corrosion, ensuring durability in various environments.
Application Areas
Metal buildings and fencing
Used for fixing corrugated steel roofing/wall panels.
Heating, Ventilation, and Air Conditioning (HVAC)
Used for ductwork and bracket installation.
Solar energy industry
Used for connecting photovoltaic brackets and rails.
Logistics and warehousing
Used for assembling lightweight shelving and logistics cages.
Our Advantages
Fast Delivery and Stable Supply
Leveraging a 500-ton raw material reserve and automated production lines, we can quickly respond to orders and ensure stable supply and timely delivery for regular and large-volume projects.
Flexible Adaptation and Customized Support
We have the capability to adjust product parameters or optimize structures based on customers' specific materials, working conditions, and installation requirements, providing tailored solutions.
Quality Assurance
Every batch undergoes strict inspection of drill point angle, hardness, and thread accuracy. This guarantees consistent performance and reliability across all products.
FAQ
Q: What torque is required for self-drilling screws? Do I need a special electric drill?
A: We recommend using medium speed with high torque settings for optimal installation results.
Q: Which type of self-drilling screw is suitable for stainless steel plates?
A: For stainless steel plates, we recommend self-drilling screws made from 410 or 304 stainless steel. Their specially designed drill points can effectively penetrate hard stainless steel materials.
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