S-90064A748 Length 3 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Eliminates pre-drilling with integrated drill tip that penetrates up to 0.21" thickness in steel and sheet metal, saving labor time and tooling costs.
• Superior corrosion resistance from zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments.
• Enhanced grip and load distribution thanks to the flanged design, which acts as an integrated washer to prevent loosening under vibration.
• High-torque installation capability with external hex drive, allowing for secure fastening with standard tools and reducing strip-out risk.
• Optimized thread engagement through thread forming (BSD) design, creating strong, permanent threads in ductile materials without chip removal.
• Full-length threading for maximum holding power along the entire 3-1/2" length, accommodating various material thicknesses.
• Precision No. 3 drill tip ensures clean, accurate hole creation and smooth thread start for consistent assembly quality.

Professional Applications & Engineering Value

These No. 12-14 thread forming tapping screws are engineered to address common challenges in steel and sheet metal fabrication, where speed, strength, and durability are critical. The zinc-plated steel material provides essential corrosion protection for outdoor or high-moisture environments, while the self-drilling tip eliminates the need for separate drilling operations—reducing assembly steps and potential misalignment. The flanged hex head design distributes clamping force evenly, minimizing surface damage and maintaining joint integrity under dynamic loads. Ideal for HVAC systems, electrical enclosures, and structural metalwork, these BSD tapping screws deliver reliable performance that meets the demands of industrial fastening applications, ensuring reduced installation time and enhanced long-term service life.

Specification Summary & Compliance

This screw features a No. 12-14 thread with a 0.216" diameter and 14 TPI, conforming to standard thread forming (BSD) specifications for consistent performance. Manufactured from zinc-plated steel, it includes a fully threaded shank and right-hand thread direction. The external hex drive and flanged head are precision-engineered to meet industrial fastening requirements, ensuring compatibility with common installation tools. Compliant with relevant industry standards for mechanical properties and surface finish, these screws are suitable for use in various steel and sheet metal applications where reliability and efficiency are paramount.