S-90096A581 5/16"-18 x 3/4" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Efficient installation through thread-cutting design that eliminates pre-tapping requirements in various materials
• Enhanced load distribution with integrated flange design, reducing surface pressure and preventing material damage
• Secure fastening in soft materials using UNC coarse threading that provides excellent pull-out resistance
• High-torque capability with external hex drive design for reliable installation with standard tools
• Full-thread engagement along the entire 3/4" length ensures maximum holding power in deep applications
• Versatile material compatibility specifically engineered for aluminum, brass, cast iron, and sheet metal applications

Professional Applications & Engineering Value

These heavy-duty flanged tapping screws solve critical challenges in metal fabrication and assembly operations. The zinc-plated steel construction provides essential corrosion protection while maintaining high tensile strength for demanding applications. The thread-cutting F-type design with UNC coarse threading creates precise mating threads in softer materials like aluminum and sheet metal, eliminating the need for separate tapping operations and reducing assembly time. The integrated flange distributes clamping force over a wider area (0.676" diameter), preventing material distortion and providing superior vibration resistance. These 5/16"-18 screws are particularly valuable in electrical enclosures, machinery frames, and automotive components where reliable fastening in various metal substrates is essential for structural integrity.

Specification Summary & Compliance

This flanged tapping screw features a 5/16"-18 UNC coarse thread with Class 2A tolerance, ensuring precise fit and reliable performance. The screw meets ASME B18.6.3 specifications (SAE J933) for dimensional accuracy and mechanical properties. Manufacturing compliance includes RoHS 3 (2015/863/EU) regulations, guaranteeing environmental safety and material restrictions adherence. The external hex drive (1/2" width) and blunt tip design provide controlled installation in thread-cutting applications requiring K drill bit (0.281" diameter) preparation.