S-93878A536 1/4"-20 x 1/2" 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 and reduced assembly time thanks to the thread forming (SW) design that creates strong threads without pre-tapping in materials like steel and aluminum.
• High torque transmission and reduced cam-out with the Phillips No. 3 drive, ensuring secure fastening and driver bit stability.
• Excellent holding power in coarse-thread applications due to the UNC 1/4"-20 thread, ideal for sheet metal, cast iron, and other common metals.
• Full-length threading for maximum grip along the entire 1/2" shank, providing consistent clamping force and vibration resistance.
• Wide material compatibility for use in steel, aluminum, brass, and cast iron, offering versatile application across various industrial projects.
• Compliance with major environmental and safety regulations including RoHS 3 and REACH, ensuring they meet global standards for responsible manufacturing.

Professional Applications & Engineering Value

These zinc-plated steel thread forming screws are engineered to solve common industrial fastening challenges, such as strip-out and loose connections in metal assemblies. The thread forming (SW) tapping method displaces material to create a zero-clearance fit, eliminating the need for pre-tapped holes and reducing installation steps. This is particularly valuable in sheet metal and aluminum applications where traditional threads may fail. The UNC coarse thread and Phillips drive provide reliable performance in high-vibration environments, making them ideal for machinery, automotive components, and structural frameworks. Their zinc plating offers a protective barrier against corrosion, ensuring long-term durability even in moderately harsh conditions, which is critical for maintaining the integrity of industrial fasteners over time.

Specification Summary & Compliance

These screws feature a 1/4"-20 UNC coarse thread with standard Class 2A tolerances for consistent fit. The thread forming (SW) design complies with industry standards for self-tapping applications in metals. They are manufactured from zinc-plated steel and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they are free of restricted substances and safe for industrial use.