S-90086A651 5/16"-18 x 3 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior material strength with zinc-plated steel construction providing excellent corrosion resistance for extended service life in demanding environments
• Efficient thread cutting capability with Type F design creates precise mating threads in various materials without pre-tapping requirements
• Optimized for multiple substrates including aluminum, brass, cast iron, and sheet metal applications with reliable holding power
• Enhanced drive stability through Phillips No. 4 drive system ensures secure tool engagement and reduced cam-out during installation
• Precision dimensional control with UNC coarse threading and 5/16"-18 specification delivers consistent performance and compatibility
• Streamlined installation process with standard 82° countersink angle and flat head design for flush mounting in prepared holes
• Full regulatory compliance meeting ASME B18.6.3 specifications and RoHS 3 environmental standards for quality assurance

Professional Applications & Engineering Value

These 5/16"-18 UNC thread cutting screws deliver exceptional engineering value by solving critical fastening challenges in aluminum, brass, cast iron, and sheet metal assemblies. The zinc-plated steel construction combined with Type F tapping method eliminates the need for separate tapping operations, significantly reducing installation time and labor costs in production environments. The coarse UNC threading provides superior pull-out resistance in softer materials, while the Phillips drive system ensures reliable torque transmission during high-volume assembly operations. The fully threaded design and blunt tip configuration facilitate precise alignment and maximum thread engagement, making these tapping screws ideal for HVAC systems, electrical enclosures, machinery guards, and structural fabrications where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

These heavy-duty fasteners feature 5/16"-18 UNC coarse threads with standard thread tolerances, 3 1/2" length, and flat head profile with 82° countersink angle. Manufactured to exacting ASME B18.6.3 specifications (SAE J933) ensuring dimensional accuracy and performance reliability. The products are RoHS 3 (2015/863/EU) Compliant for environmental safety and suitable for use with drill bit size L (0.29" diameter) for proper hole preparation in target materials.