Home » Products » Weld Screws » Bi-Metal Self-Drilling Screws » Austenitic Bi-Metal Self Drilling Screws, Hex Washer Head Point No.3, 304/A2 & 316/A4+420 Bi-Metal, Ruspert Coated

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Austenitic Bi-Metal Self Drilling Screws, Hex Washer Head Point No.3, 304/A2 & 316/A4+420 Bi-Metal, Ruspert Coated

Product Overview
Our Austenitic Bi-Metal Self Drilling Screws are industrial-grade fasteners engineered for heavy-duty construction and metal framing applications. Featuring Hex Washer Head, Point No.3 drill point, and bi-metal construction combining Austenitic stainless steel (304/A2 or 316/A4) with AISI 420 drill tip, these screws deliver exceptional drilling performance, corrosion resistance, and long-term durability. With a maximum drilling capacity of 6mm and double thread design, they are optimized for attaching metal rails to metal purlins and insulated foam panels in heavy metal frame applications.
Key Features
Austenitic Bi-Metal Construction: Combines the corrosion resistance of 304/A2 or 316/A4 stainless steel body with the hardness of AISI 420 drill point, ensuring both durability and rust protection for long service life.
Hex Washer Head Design: Provides a large bearing surface for even load distribution, preventing pull-through and ensuring a secure, stable installation.
Point No.3 Drill Tip: Precision-engineered drill point enables efficient self-drilling with a maximum drilling capacity of 6mm, eliminating the need for pre-drilling holes and reducing installation time.
Double Thread Design: Optimized double thread geometry enhances grip and pull-out strength, ensuring secure fastening of insulated foam panels to steel purlins in heavy metal frame applications.
Ruspert or Dacromet Coatings: Premium anti-corrosion coatings provide extended protection against rust and environmental damage, making the screws suitable for outdoor and humid environments.
High Performance Specs: Recommended screw driver speed of MAX 2500 R.P.M. ensures optimal drilling efficiency and prevents overheating or bit damage during installation.
Common Applications
Attaching metal rails to metal purlins in construction projects
Fastening insulated foam panels to steel purlins
Heavy metal frame applications and structural installations
Metal to metal and metal to wood composite fastening
Outdoor construction projects requiring corrosion-resistant fasteners
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External hex head features strong stress resistance and high torque resistance with good anti-vibration and anti-loosening effect, commonly used in steel structure construction and factory enclosure.

Integrally molded stainless steel hex recess is weather-proof, rust-proof and high-strength without deformation, keeping firm and durable under long-term outdoor wind and rain exposure.

Thethread is a fine thread design with round thread crests, dense pitch, arc-shaped thread cross-section, sharp drill tail, natural connection with the thread, and less resistance when screwing in.

Wing Tek point comes with symmetrical fins on both sides of the point, wide and tough fins with sharp drill tip, integrally molded fins and point body with unique shape and high rigidity.

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