S-90096A539 1/4"-20 x 5/8" 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.
• High-torque installation capability thanks to the external hex/slotted drive, allowing for secure fastening with standard tools.
• Efficient thread cutting in tough materials using Type F design, reducing installation effort in aluminum, brass, cast iron, and sheet metal.
• Enhanced load distribution and vibration resistance from the integrated 0.52" flange, minimizing loosening under stress.
• Reliable full-length engagement with fully threaded 5/8" length, ensuring consistent holding power across the entire shank.
• Wide material compatibility with UNC coarse threads, optimized for use in non-ferrous metals and sheet applications without pre-tapped holes.
• Streamlined assembly process as it requires only a No. 2 drill bit (0.221" diameter) for preparation, saving time and labor.

Professional Applications & Engineering Value

Engineered for heavy-duty threading applications, this zinc-plated steel flanged tapping screw addresses common challenges in assembling aluminum, brass, cast iron, and sheet metal components. Its thread cutting Type F design and UNC coarse threads enable precise, self-forming threads that eliminate the need for separate tapping operations, reducing assembly time and tooling costs. The external hex/slotted drive provides excellent torque transmission, preventing cam-out during high-stress installations. Combined with the flanged head, it distributes clamping force evenly, resisting vibration and loosening in dynamic industrial settings like machinery, automotive frames, and metal fabrication. This makes it an ideal industrial fastener for applications demanding durability and reliability without pre-threaded holes.

Specification Summary & Compliance

This 1/4"-20 tapping screw features UNC coarse threads with standard thread spacing and a fully threaded 5/8" length for consistent performance. It complies with ASME B18.6.3 specifications (referencing SAE J933) for dimensional accuracy and mechanical properties, ensuring interoperability and safety. The product is RoHS 3 (2015/863/EU) Compliant, adhering to environmental regulations for restricted substances, making it suitable for global industrial supply chains.