S-90087A898 5/16"-18 x 2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding industrial environments
• Efficient thread cutting action with Type F design eliminates need for pre-tapped holes, reducing installation time and labor costs
• Enhanced drive stability through Phillips No. 4 drive system prevents cam-out and ensures secure fastening control
• Broad material compatibility specifically engineered for aluminum, brass, cast iron, and sheet metal applications
• Reliable coarse UNC threading provides excellent holding power and vibration resistance in various substrates
• Full 2-inch threading coverage ensures maximum engagement strength and load distribution
• Standard pan head design offers low-profile installation with adequate bearing surface for secure fastening

Professional Applications & Engineering Value

These 5/16"-18 thread cutting screws deliver exceptional value in metal fabrication and assembly operations where tapping efficiency and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection while maintaining high tensile strength for demanding applications. Engineered with Type F thread cutting geometry, these screws effectively form mating threads in aluminum components, brass fittings, cast iron housings, and sheet metal assemblies without requiring pre-tapped holes. The coarse UNC threading ensures rapid installation and superior resistance to vibrational loosening, while the Phillips No. 4 drive enables efficient power transmission during high-volume assembly operations. This combination of features addresses critical industrial pain points including reduced installation time, elimination of tapping operations, and reliable long-term performance in diverse metal substrates.

Specification Summary & Compliance

These tapping screws feature precision 5/16"-18 UNC coarse threads with standard Class 2A tolerance for consistent fit and performance. The 2-inch length and fully threaded design provide complete engagement capability. Manufacturing complies with ASME B18.6.3 specifications and meets SAE J933 standards for quality assurance. The recommended 0.281" drill bit (Size K) ensures proper hole preparation for optimal thread cutting performance in designated materials.