S-91515A570 Length 2 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh industrial environments
• Efficient installation with self-drilling tip that eliminates pre-drilling requirements in steel and sheet metal up to 0.098" thickness
• Enhanced load distribution through flanged truss head design that provides wider bearing surface and prevents pull-through
• Secure fastening with thread forming BSD design that creates strong, permanent threads in base materials
• Reliable drive engagement with Phillips No. 2 drive that ensures consistent torque transmission during installation
• Maximum holding power from fully threaded 2-1/2" length that provides complete engagement along the entire fastener
• Versatile application with right-hand threads and 18 TPI configuration suitable for various steel and sheet metal assemblies

Professional Applications & Engineering Value

These No. 8 tapping screws deliver exceptional performance in demanding steel and sheet metal applications where reliability is critical. The zinc-plated steel construction provides essential corrosion protection for industrial environments, while the self-drilling tip significantly reduces installation time and labor costs by eliminating separate drilling operations. The flanged truss head design offers superior clamping force distribution, preventing material deformation and ensuring secure fastening in thin-gauge materials. As thread forming screws with BSD specification, they create precise, strong threads that resist vibration loosening and maintain integrity under dynamic loads. The combination of fully threaded design and Phillips drive makes these industrial fasteners ideal for HVAC systems, metal framing, electrical enclosures, and machinery assembly where speed, strength, and durability are paramount.

Specification Summary & Compliance

These tapping screws feature precision 0.164" thread diameter with 18 TPI right-hand threading and comply with BSD tapping screw standards. The thread forming method ensures consistent performance in base materials, while the zinc-plated surface treatment meets industrial corrosion resistance requirements. Manufactured to exacting dimensional tolerances for reliable performance in steel and sheet metal applications, these screws are suitable for various industrial fastening applications requiring self-drilling capability and flanged head design for optimal load distribution.