Bi-metal Self-Tapping Screws

High-Performance Fasteners for Reliable Solar Installations

Bimetal self-tapping screws are advanced fasteners designed for high-strength, corrosion-resistant applications such as solar mounting systems, metal roofing, and outdoor steel structures.
They combine two different metals — typically a stainless steel head and a carbon steel drilling tip — to achieve outstanding corrosion resistance and superior drilling performance in one product.

This smart hybrid design makes bimetal screws ideal for solar installations exposed to rain, salt air, and extreme temperatures, ensuring long-lasting durability and safety.

Product Advantages

1. Dual-Metal Construction

The upper part is made of stainless steel (A2 or A4), offering excellent corrosion resistance, while the lower part (the drill point) is made of carbon steel for fast, strong drilling into metal or steel structures.

2. Excellent Corrosion Resistance

Thanks to the stainless steel head, the screw resists oxidation and rust even in coastal regions, humid climates, or industrial areas where corrosion is a major concern.

3. Fast and Efficient Installation

The self-drilling point eliminates the need for pre-drilling, saving time and labor costs on site.
Installers can quickly fasten components directly to steel or aluminum profiles with minimal effort.

4. Strong and Secure Connection

The carbon steel drilling tip ensures a firm grip and high pull-out strength, keeping solar panels and mounting rails securely in place even under strong wind or vibration.

5. Long Service Life

With excellent weather resistance and stable mechanical properties, bimetal self-tapping screws can last for more than 20 years in solar mounting systems, ensuring long-term reliability.

⚙️ Technical Specifications

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Wide Range of Applications

1. Solar Mounting Systems

Bimetal self-tapping screws are widely used in roof and ground solar structures.
They fasten mounting rails, brackets, and clamps to steel or aluminum profiles, providing stable connections that withstand harsh outdoor conditions.

2. Metal Roofing and Cladding

Perfect for fixing roof sheets, support frames, and metal panels to structural steel, ensuring waterproof and long-lasting performance.

3. Steel and Aluminum Structures

Their strong drilling tips make them suitable for light steel frameworks, building facades, and industrial installations.

4. Harsh Outdoor Environments

Thanks to their stainless steel construction, bimetal screws perform well in marine environments, wind farms, and solar farms located in coastal or desert regions.

[Insert image suggestion: Close-up of screw fastening solar rail on steel beam]

Installation Tips

• Use with an impact driver or hex socket tool for fast installation.

• Avoid over-tightening to maintain waterproof integrity.

• Compatible with aluminum rails, C-channel steel, and stainless brackets.

• Available in various lengths and head types depending on your structure design.

Why Choose Our Bimetal Self-Tapping Screws

At [Your Company Name], we manufacture and supply high-quality solar fasteners designed for maximum reliability.
All screws undergo strict quality control to ensure consistent strength, precision, and corrosion resistance.

Our advantages:

• ✅ Customized sizes and head types

• ✅ Strict salt-spray corrosion testing

• ✅ Competitive factory price

• ✅ Fast delivery for bulk orders

• ✅ Full support for solar project design

We don’t just supply fasteners — we deliver secure, long-lasting solar connections.

FAQs About Bi-metal Self-Tapping Screws

Q1: What materials are used in bimetal self-tapping screws?
A: Typically, the head and thread are made from stainless steel (A2 or A4) for corrosion protection, while the drill tip is carbon steel for superior hardness and drilling ability.

Q2: Why are bimetal screws preferred in solar mounting systems?
A: They provide excellent corrosion resistance and mechanical strength, ideal for outdoor solar structures exposed to sun, rain, and wind.

Q3: Can they be used in coastal or high-humidity areas?
A: Yes. The stainless steel part prevents rust and galvanic corrosion, ensuring long-term stability even in harsh environments.

Q4: Do they require pre-drilling?
A: No. The self-tapping tip can directly penetrate metal sheets or profiles without pre-drilling.

Q5: Are custom sizes available?
A: Yes, we offer customized lengths, diameters, and head designs to match your solar mounting requirements.