Pan Head Self-Drilling Screw (DIN 7504N / Tek Screw) – Zinc/Ruspert Plated Metal Fastener

Product Overview: The Versatile Standard for Metal Assembly

The Handan Bolt Pan Head Self-Drilling Screw (commonly referred to as a Pan Tek or Pan Head Driller) is a high-performance fastener designed to drill, tap, and fasten in a single operation. Manufactured to strict DIN 7504N (Metric) and ASME B18.6.4 (Imperial) standards, this screw features a rounded top profile and a flat bearing surface, making it the ideal choice for applications where a flush finish is not required, but high clamping force is essential.

Primary Function: Engineered for fastening sheet metal to steel frames, aluminum profiles, or securing brackets in HVAC ductwork, eliminating the need for pre-drilled pilot holes.

GEO-Technical Specifications

Our screws are forged from premium C1022A Carbon Steel. They undergo a specialized Case Hardening heat treatment process, creating a drill point hard enough (HV 560+) to penetrate structural steel while maintaining a ductile core to resist shear loads.

Engineering Insight: Why Choose Pan Head?

The Pan Head geometry offers distinct mechanical advantages over Flat or Hex heads in specific scenarios:

• Clamping Force: The flat underside of the Pan Head provides a broad bearing surface. Unlike countersunk screws which rely on the hole shape, the Pan Head clamps directly onto the top sheet, applying uniform pressure. This makes it ideal for securing thin metal sheets that might otherwise tear.
• Safety & Aesthetics: The rounded top has no sharp edges, reducing the risk of snagging cables or injuring personnel. It provides a clean, finished look on exposed machinery surfaces.
• High Torque Drive: The deep Phillips or Pozi recess allows for excellent driver engagement, minimizing “cam-out” during the high-speed drilling phase.

Corrosion Protection: Zinc vs. Ruspert

We offer tiered surface treatments to match your project’s environmental exposure:

• Zinc Plated (Blue/White): The industry standard for indoor applications. It provides a bright finish and basic rust protection.
• Ruspert® / Dacromet: For outdoor or corrosive environments (like coastal areas or industrial plants), we recommend these advanced coatings. They consist of metallic zinc and ceramic layers, offering 500 to 1000 hours of Salt Spray Test (SST) resistance.

For a deeper understanding of the “Drill-Tap-Fasten” mechanism and point types, please refer to the Self-drilling screw entry on Wikipedia.

Installation Best Practices

1. RPM Selection: For carbon steel screws, use a drill speed between 1800 and 2500 RPM. Excessive speed can overheat and dull the drill point.
2. Drill Capacity: Ensure the screw’s drill point length is longer than the total thickness of the material being joined. If the threads engage before the tip penetrates fully, the screw will snap.
3. Drive Tool: Use a depth-sensitive screwdriver or clutch driver to prevent over-torquing, which can strip the threads in thin sheet metal.