S-93882A108 4-40 x 3/8" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments.
• Enhanced torque transmission and secure installation via the external hex/slotted drive, preventing stripping during high-torque applications.
• Improved load distribution and joint stability from the integral flange design, reducing the risk of material damage and loosening under vibration.
• Reliable thread-forming capability for strong, permanent threads in materials like steel, aluminum, and sheet metal without the need for pre-tapped holes.
• Broad material compatibility with coarse UNC threads designed for use in steel, aluminum, brass, and cast iron, offering versatile application options.
• Streamlined assembly process with a fully threaded, blunt tip design that aligns easily and drives efficiently for faster production cycles.
• Compliance with strict environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use in global supply chains.

Professional Applications & Engineering Value

This 4-40 UNC zinc-plated steel flanged tapping screw is engineered to solve common fastening challenges in metal fabrication and assembly. Its thread-forming design creates durable, high-strength threads directly in base materials, eliminating the need for separate tapping operations and reducing assembly time and costs. The flanged head provides a larger bearing surface, distributing clamp load effectively to prevent surface damage and maintain seal integrity in steel, aluminum, and sheet metal applications. Made from zinc-plated steel, it offers excellent resistance to corrosion, ensuring long-term reliability in harsh conditions. The external hex drive allows for high torque application, making it ideal for automated or manual assembly lines where precision and speed are critical.

Specification Summary & Compliance

This screw features a No. 4-40 UNC coarse thread with a thread diameter of 0.112" and is fully threaded for consistent holding power. It is designed for use with a No. 41 drill bit (0.097" diameter) and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it meets international standards for hazardous substance restrictions and chemical safety.