S-90086A646 5/16"-18 x 1 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior material protection with zinc plating that resists corrosion in demanding industrial environments
• Excellent thread-cutting performance in aluminum, brass, cast iron, and sheet metal without requiring pre-tapped holes
• Optimized drive efficiency with No. 4 Phillips head providing secure tool engagement and reduced cam-out risk
• Enhanced flush mounting capability thanks to standard flat head profile with 82° countersink angle
• Reliable coarse thread design (UNC) that ensures faster installation and superior holding power in softer materials
• Full threading along entire length maximizes grip strength and distributes load evenly across the fastener
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

These 5/16"-18 UNC thread cutting tapping screws deliver exceptional value in metal fabrication and assembly operations. The zinc-plated steel construction provides durable corrosion resistance while the Type F thread cutting design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs. The coarse UNC thread spacing combined with full threading ensures maximum pull-out resistance in softer materials like aluminum and sheet metal, preventing stripping and maintaining joint integrity under vibration. The standard flat head profile with 82° countersink creates clean, flush finishes in automotive, HVAC, and electrical enclosure applications where protrusions are unacceptable. These thread cutting screws are engineered to solve common fastening challenges in metalworking while maintaining compliance with critical industry standards.

Specification Summary & Compliance

These tapping screws feature 5/16"-18 UNC coarse threads with standard Class 2A tolerance for reliable engagement. The zinc-plated steel construction meets RoHS 3 (2015/863/EU) compliance for environmental safety. Manufacturing follows ASME B18.6.3 specifications (SAE J933) ensuring dimensional accuracy and performance consistency. The fully threaded design with blunt tip and right-hand threading provides optimal fastening in designated materials when used with recommended 0.29" drill bit size.