S-90086A648 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 creates precise threads in aluminum, brass, cast iron, and sheet metal without pre-tapping
• Enhanced driving stability through Phillips No. 4 drive system prevents cam-out and ensures secure installation
• Optimal material engagement with fully threaded 2" length and coarse UNC thread pattern for maximum holding power
• Flush mounting capability with standard 82° flat head profile that sits perfectly countersunk in prepared holes
• Reliable performance compliance meeting ASME B18.6.3 specifications and RoHS 3 environmental standards
• Versatile material compatibility specifically engineered for multiple industrial substrates including non-ferrous metals and sheet materials

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 provides essential corrosion protection while maintaining high tensile strength for structural integrity. The Type F tapping screw design with cutting threads eliminates the need for separate tapping operations, significantly reducing installation time and labor costs in high-volume manufacturing. The fully threaded configuration ensures maximum thread engagement along the entire 2" length, distributing clamping force evenly and preventing material distortion in thin-section applications. The 82° flat head with Phillips drive offers reliable countersinking and driving performance, making these industrial fasteners ideal for automotive, machinery, and metal fabrication applications where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

These tapping screws feature 5/16"-18 UNC coarse threads with standard Class 2A tolerance for reliable engagement. The manufacturing process adheres to ASME B18.6.3 specifications (SAE J933) ensuring dimensional accuracy and performance consistency. Environmental compliance includes RoHS 3 (2015/863/EU) certification, making them suitable for regulated industries. The thread cutting Type F design is optimized for use with L drill bit (0.29" diameter) and features a blunt tip for precise starting alignment in prepared holes.