Bimetal Self Tapping Screws - Durable & Corrosion Resistant

Product Overview:

Fasto Bi-metal self-drilling screws (also known as Bi-metal self-tapping screws) combine an austenitic stainless steel body with a hardened carbon steel drill point. Manufactured to DIN 7504 and ISO 15480 standards, these composite fasteners are designed for heavy-duty metal-to-metal applications where permanent corrosion protection and high-speed drilling are both required. Click here to get latest price.

Technical Specifications:

1. Body Material: SS304 (A2) / SS316 (A4)

2. Tip Material: Hardened Carbon Steel

3. Standards: DIN 7504, ISO 15480

4. Drill Tip Number: #1 to #5

5. Penetration: Up to 12.5mm Steel

6. Anti-Corrosion Coating: Ruspert / Zinc Plated

7. Sealing Washer: EPDM Option Available

8. Head Styles: Hex / Pan / Countersunk

9. Service Cycle: 25+ Year Durability

10. Mechanical Load: High-Strength Structural

Product Parameters:

Why Choose Fasto?

Fasto Industrial brings over 20 years of manufacturing expertise to the global fastener market. Operating our own production plants allows us to maintain strict oversight through ISO 9001 and IATF 16949 quality management systems. Every batch undergoes rigorous testing to verify mechanical properties and corrosion resistance, ensuring our products carry valid CE, SGS, and RoHS certifications for high-stakes construction projects.

Our engineering team specializes in bi-metal fusion technology, which addresses the physical limits of standard stainless steel. By welding a hardened tip to a 304 or 316 stainless body, we provide a fastener that prevents galvanic corrosion while eliminating the need for pre-drilling. This solution is particularly effective for solar mounting, marine structures, and railway maintenance, where thermal expansion compatibility and long-term durability are critical for safety.

Professional FAQ

Q: Why use a bi-metal screw instead of a standard stainless steel screw?

A: Standard stainless steel is too soft to drill through structural steel plates. Bi-metal screws feature a hardened steel tip that pierces metal easily, while the stainless body provides permanent rust protection.

Q: Are these screws compatible with dissimilar metals?

A: Yes. The bi-metal construction helps minimize issues caused by thermal expansion and galvanic corrosion, making them ideal for fastening aluminum or steel panels to structural frames.

Q: Do you provide EPDM washers for roofing applications?

A: We offer hex head bi-metal screws equipped with EPDM bonded washers. These components ensure a watertight seal and are used extensively in metal cladding and roofing systems.

Q: How do I choose the correct drill tip number?

A: The drill tip number (#1 to #5) determines the maximum thickness the screw can penetrate. For example, a #5 tip is required for structural steel plates up to 12.5mm thick.