S-91515A500 Length 2 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Effortless installation with self-drilling tip that eliminates pre-drilling in steel and sheet metal up to 0.098" thickness
• Superior corrosion resistance thanks to zinc-plated steel construction for extended service life in demanding environments
• Enhanced load distribution from the wide truss head with integrated flange, reducing surface damage and preventing pull-through
• Secure, permanent fastening achieved through thread-forming BSD design that creates strong, wear-resistant threads in base materials
• Optimized driving efficiency with Phillips No. 2 drive that provides reliable torque transfer and reduces cam-out risk
• Maximum grip strength from fully threaded 2-1/4" length ensuring consistent holding power across the entire fastener
• Regulatory compliance assurance with RoHS 3 certification for safe, environmentally responsible manufacturing

Professional Applications & Engineering Value

These zinc-plated steel tapping screws deliver exceptional value in steel and sheet metal applications where speed and reliability are critical. The combination of thread-forming BSD design and self-drilling tip eliminates multiple installation steps, significantly reducing assembly time and labor costs. The truss head with flange provides a wider bearing surface that distributes clamping force effectively, preventing material distortion in thin-gauge metals. With fully threaded construction and 18 threads per inch, these screws maintain consistent engagement throughout the fastened joint, offering vibration resistance and long-term structural integrity for HVAC systems, electrical enclosures, and metal framing projects.

Specification Summary & Compliance

This No. 8 x 2-1/4" tapping screw features a 0.164" thread diameter with 18 threads per inch in right-hand thread direction. Manufactured to BSD tapping screw standards with Class 2A thread tolerances for reliable performance. The product is RoHS 3 (2015/863/EU) Compliant, meeting current environmental regulations for hazardous substance restrictions.