S-90096A391 12-24 x 3/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-lasting performance in harsh industrial environments.
• Effortless installation and removal via the external hex/slotted drive, providing flexibility for various tools and reducing assembly time.
• Enhanced load distribution from the flanged design, minimizing surface damage and improving joint integrity in sheet metal and cast applications.
• Reliable thread cutting action with Type F tapping screw design, enabling secure fastening in aluminum, brass, and cast iron without pre-tapped holes.
• Broad material compatibility for use in aluminum, brass, cast iron, and sheet metal, offering versatile application across multiple industries.
• Optimized thread engagement with coarse UNC threads and full threading, ensuring strong hold and vibration resistance in demanding conditions.
• Precision fit and reduced rework by pairing with a No. 11 drill bit (0.191" diameter), facilitating accurate hole preparation and consistent performance.

Professional Applications & Engineering Value

This 12-24 UNC zinc-plated steel flanged tapping screw is engineered to address common industrial challenges such as material fatigue and installation inefficiency. Its thread cutting design allows for direct use in ductile materials like aluminum, brass, and cast iron, eliminating the need for separate tapping operations and reducing labor costs. The coarse thread spacing and fully threaded shank provide excellent pull-out resistance and stability in sheet metal assemblies, preventing loosening under vibration. The zinc plating offers a protective barrier against corrosion, extending service life in outdoor or humid environments. By integrating the flange feature, it distributes clamping force evenly, protecting soft materials from deformation and ensuring reliable, long-term fastening in automotive, machinery, and construction applications.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a size of 12-24 and coarse spacing, ensuring dimensional accuracy and interchangeability. It meets ASME B18.6.3 specifications (referencing SAE J933) for quality and performance in tapping screw applications. The product is fully RoHS 3 (2015/863/EU) compliant, confirming it is free from hazardous substances, and is designed for use with a No. 11 drill bit (0.191" diameter) to maintain precise fit and assembly integrity.