S-90086A649 5/16"-18 x 2 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in harsh industrial environments
• Excellent material compatibility for use in aluminum, brass, cast iron, and sheet metal without requiring pre-tapped holes
• Enhanced driving efficiency with Phillips No. 4 drive style providing secure tool engagement and reduced cam-out risk
• Optimized thread engagement through UNC coarse threading and Type F thread cutting design for faster installation and strong holding power
• Precise flush mounting with standard 82° flat head profile that sits evenly with material surfaces
• Full-length threading ensures maximum grip along the entire 2½" length for superior fastening strength
• Regulatory compliance meets ASME B18.6.3 specifications and RoHS 3 standards for quality assurance

Professional Applications & Engineering Value

These 5/16"-18 thread cutting screws deliver exceptional engineering value for industrial assembly applications requiring reliable fastening in challenging materials. The zinc-plated steel construction provides essential corrosion protection while the Type F tapping screw design with UNC coarse threading eliminates the need for separate tapping operations, significantly reducing installation time and labor costs. The Phillips flat head configuration ensures flush mounting in sheet metal, aluminum, brass, and cast iron applications, making them ideal for manufacturing, automotive, and metal fabrication industries where vibration resistance and structural integrity are critical. The combination of thread cutting capability and standardized dimensions provides consistent performance across production runs.

Specification Summary & Compliance

These industrial tapping screws feature precise 5/16"-18 UNC coarse thread specifications with Class 2A tolerance, 2½" length, and 0.313" thread diameter. Manufactured to ASME B18.6.3 standards SAE J933, ensuring dimensional accuracy and performance reliability. The screws are RoHS 3 (2015/863/EU) Compliant for environmental safety and suitable for use with 0.29" diameter drill bits (Size L) for proper hole preparation. The 82° countersink angle matches standard flat head applications for seamless integration into existing assembly processes.