S-90064A725 Length 5/16" Tapping Screws

Key Features & Benefits at a Glance

• Corrosion-resistant zinc plating extends service life in demanding industrial environments.
• Thread forming (BSD) design creates strong, permanent threads in steel and sheet metal without pre-tapping, reducing installation steps.
• Integrated drilling tip with a maximum capacity of 0.098" eliminates the need for separate pilot holes, speeding up assembly.
• External hex head with 1/4" width provides a secure grip for high-torque installation and removal with standard tools.
• Flanged design distributes clamping pressure over a wider area (0.348" flange diameter), enhancing joint stability and preventing pull-through.
• Fully threaded 5/16" length ensures maximum engagement and holding power in thin materials.
• Precise 0.164" diameter with 18 TPI delivers reliable, vibration-resistant fastening in inch-system applications.

Professional Applications & Engineering Value

These No. 8 zinc-plated steel tapping screws are engineered to solve common assembly challenges in steel and sheet metal fabrication. The thread forming technology cold-forms mating threads as it's driven, resulting in zero chip production and a tighter, more vibration-resistant fit compared to traditional cutting screws. This is critical in electrical enclosures, HVAC systems, and automotive panels where loose debris can cause failures. The combination of a self-drilling tip and external hex drive allows for rapid, one-step installation with standard hex drivers, significantly reducing labor time and tooling costs. The flanged design further enhances performance by acting as an integrated washer, reducing surface damage and maintaining seal integrity under dynamic loads.

Specification Summary & Compliance

This BSD type tapping screw conforms to inch system standards with a No. 8 screw size, 0.164" thread diameter, and 18 threads per inch. It features a right-hand thread and is fully threaded along its 5/16" length. The screw is manufactured from steel with a zinc-plated finish for corrosion protection and is designed for use in materials up to 0.098" thick. Compliant with industry standards for thread-forming screws, it is suitable for applications requiring reliable performance in steel and sheet metal assemblies.