| Material: | Stainless Steel + Carbon Steel |
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| Type: | Hexagon Head With Flange |
| Groove: | Hexagon |
| Samples: |
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| Customization: |
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Shipping Cost:
Estimated freight per unit. |
about shipping cost and estimated delivery time. |
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| Payment Method: |
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| Initial Payment Full Payment |
| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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Suppliers with verified business licenses
Audited Supplier
| Union Hex Head With Flange Stainless Steel Self-Drilling Screw |
| Name |
| Bi-metal Self-Drilling Screw |
| Material |
| Bi-metal |
| Surface Treatment |
| Customized Coating |
| Size |
| ST3.5-ST6.3 or non-standard as request&design |
| Length |
| Diameter2.9mm-10mm, max length up to 400mm or non-standard as request&design |
| Quality |
| Sample Testing Or Third-party Inspection |
| Price |
| Customized Production With Big Discount |
| Lead Time |
| Based on quantity |
Bi-metal screws sometimes referred to as twin-fast screws, are made of two separate metals joined together. They have a carbon steel core and stainless steel exterior. Carbon steel provides strength while stainless steel provides corrosion resistance. This makes bi-metal screws ideal for use in outdoor applications like solar power systems and roofing.
Bi-metal screws are hardened through heat treatment to maximize their toughness and resistance to stripping and breaking. They can withstand high torque and grip well into materials like wood and metal. Their unique composition gives them excellent resistance to rust and corrosion compared to regular carbon steel screws.
Uses for Solar Mounting
For solar panel installations, bi-metal screws are commonly used to secure:
Their threading grips tightly, while their stainless steel exteriors eliminate rust stains on the roofing materials. Bi-metal screws also hold up well to thermal expansion and contraction of the roof.
The combination of strength and corrosion resistance makes bi-metal screws well-suited for roofing needs. They help roofs stand up to sun, rain, snow, and wind. Their versatility allows use with many roofing materials like asphalt shingles, slate, metal sheeting, and more.
Corrosion Resistance
Stainless steel combined with a carbon steel core gives bi-metal screws excellent resistance to rust and corrosion. The stainless steel exterior protects against oxidation, allowing long-term outdoor use.
Bi-Metal Coating
| Surface Treatment | ||||
| Types | Class2 | Class3 | Class4 | Dacromet |
| Coating Material | Mechanical Galvanized | Mechanical Galvanized | Mechanical Galvanized | Zinc and Aluminum |
| Salt Spray Test | 500Hours | 1000Hours | 2000Hours | 1000Hours |
Suppliers with verified business licenses
Audited Supplier 
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