Point No.5 Bi-Metal Self Drilling Screws, Hex Flange Head, 304-A2 & 316-A4, Heavy Duty Roofing Fasteners

Product Overview
Our Austenitic Bi-Metal Self Drilling Screws are heavy-duty industrial fasteners engineered for demanding construction and metal framing applications. Featuring a robust Hex Washer Head, precision Point No.5 drill tip, and reliable single thread design, these screws combine the exceptional corrosion resistance of 304/A2 or 316/A4 austenitic stainless steel with the high hardness of AISI 420 steel drill point. This bi-metal construction delivers outstanding performance: they drill faster, hold stronger, and resist rust and corrosion even in harsh outdoor environments. With a maximum drilling capacity of 12mm and optimized for steel purlin applications, they provide reliable, long-lasting fastening for heavy metal frame structures.
Key Features
Austenitic Bi-Metal Construction: Combines 304-A2 or 316-A4 stainless steel body with AISI 420 drill point, offering superior corrosion resistance, high tensile strength, and excellent drilling hardness for extended service life.
Hex Washer Head Design: The large flange provides a wide bearing surface, distributing load evenly to prevent pull-through and ensuring a secure, stable installation, ideal for heavy-duty structural applications.
Point No.5 Drill Tip: Precision-engineered drill point enables fast, efficient self-drilling with a maximum capacity of 12mm, eliminating pre-drilling holes and significantly reducing installation time on-site.
Single Thread Design: The single thread geometry offers consistent grip and pull-out resistance, providing reliable holding power in steel purlins, preventing loosening under dynamic loads and thermal expansion/contraction.
Optimized for 12mm Steel Purlins: Specifically designed for fastening metal rails to metal purlins, ensuring a tight, secure fit without damaging the base material.
Premium Anti-Corrosion Coatings: Available with Ruspert or Dacromet coatings, offering exceptional resistance to rust, corrosion, and environmental damage, making the screws suitable for outdoor, coastal, and humid environments.
Professional Performance Specs: Recommended screw driver speed of MAX 1800 R.P.M. ensures optimal drilling efficiency and prevents overheating or bit damage during installation.
Common Applications
Attaching metal rails to metal purlins in roof and wall construction
Heavy metal frame applications and structural steel installations
Industrial building and warehouse construction projects
Outdoor and coastal construction requiring corrosion-resistant fasteners
General metal-to-metal fastening in heavy-duty environments

Custom Available:  We are factory direct, supporting custom service in specification, package from quantity to carton, etc. We also provide professional and excellent after-sales service to guarantee your purchasing experience.