S-93878A110 4-40 x 1/2" 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 reduced tool wear thanks to the Phillips drive design, providing secure torque application and minimizing slippage.
• Reliable thread forming action with UNC coarse threads, creating strong, permanent fastenings in materials like steel and aluminum without pre-tapping.
• Broad material compatibility for use in steel, aluminum, brass, cast iron, and sheet metal, offering versatile application solutions.
• Enhanced durability and consistent performance from the fully threaded, blunt tip design, which prevents cross-threading and ensures uniform load distribution.
• Compliance with global environmental standards including RoHS 3 and REACH, making them safe for industrial use and international supply chains.
• Secure and stable fastening with a standard pan head profile, providing a low-profile finish and increased bearing surface for better clamping force.

Professional Applications & Engineering Value

These 4-40 UNC thread forming screws are engineered to address common challenges in industrial assembly, such as vibration loosening and material fatigue. Made from zinc-plated steel, they offer excellent resistance to rust and corrosion, extending service life in demanding applications like automotive components, machinery frames, and electronic enclosures. The thread forming (SW) design displaces material to create strong, precise threads without chips, reducing the risk of debris in sensitive equipment. With a Phillips drive and coarse UNC threads, they ensure quick, secure installation in steel, aluminum, brass, and cast iron, minimizing assembly time and improving overall structural integrity for B2B clients seeking reliable, high-volume fastening solutions.

Specification Summary & Compliance

This product adheres to UNC thread standards with a size of 4-40 and coarse spacing, ensuring compatibility with common industrial specifications. Dimensions include a 1/2" length, 0.219" head diameter, and fully threaded shank for consistent performance. Manufactured to precise tolerances, these screws comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial markets.