S-91515A427 Length 3 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Eliminates pre-drilling requirements with integrated drilling tip that penetrates up to 0.21" thickness in steel and sheet metal
• Superior corrosion resistance through zinc-plated steel construction for extended service life in industrial environments
• Enhanced driving efficiency with Phillips No. 2 drive that provides secure torque transfer and reduces cam-out
• Maximum holding power through fully threaded design that ensures complete engagement along the entire fastener length
• Increased bearing surface with wide truss head and 0.452" flange diameter for better load distribution
• Reliable thread-forming performance with BSD type design that creates strong, permanent threads in parent material
• Simplified inventory management with RoHS 3 compliance meeting international environmental standards

Professional Applications & Engineering Value

These zinc-plated steel tapping screws deliver exceptional value in steel and sheet metal applications where drilling and fastening operations need consolidation. The thread-forming BSD design eliminates the need for separate tapping operations, significantly reducing assembly time and labor costs. The No. 3 drilling tip with 5/16" length provides immediate penetration capability for materials up to 0.21" thick, while the fully threaded configuration ensures maximum pull-out resistance. The Phillips No. 2 drive offers familiar, efficient installation, and the wide truss head with flange creates an expanded bearing surface that prevents pull-through in thinner materials. This combination of features makes these tapping screws ideal for HVAC systems, electrical enclosures, automotive components, and industrial machinery where reliable, vibration-resistant fastening is critical.

Specification Summary & Compliance

These tapping screws feature a 0.216" thread diameter with 14 threads per inch in right-hand orientation and 3-1/2" length. Manufactured as BSD type thread-forming screws with fully threaded shank and No. 3 drilling tip. The zinc-plated steel construction provides consistent performance, while the Phillips No. 2 drive ensures standard tool compatibility. These fasteners are RoHS 3 (2015/863/EU) Compliant, meeting current environmental regulations for restricted substances in electrical and electronic equipment applications.