S-93878A540 1/4"-20 x 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments.
• High-strength thread forming design creates strong, permanent threads in materials like steel and aluminum without chips, ensuring reliable fastening.
• Efficient installation with Phillips No. 3 drive, providing good torque transfer and reducing cam-out during assembly.
• Wide material compatibility for use in steel, aluminum, brass, cast iron, and sheet metal, offering versatile application solutions.
• Secure, vibration-resistant hold from UNC coarse threading and fully threaded shank, maintaining clamp load under stress.
• Pan head design with a rounded profile for a low-profile finish and increased bearing surface, distributing load effectively.
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

These 1/4"-20 thread forming tapping screws are engineered to address common industrial fastening challenges, such as strip-out and loosening in steel, aluminum, and sheet metal assemblies. The zinc-plated steel material provides a durable barrier against rust, while the SW Type 3 thread forming design displaces material to form precise, strong internal threads without creating chips—ideal for blind holes and soft metals. This eliminates the need for pre-tapped holes, reducing installation time and labor costs. The Phillips drive ensures straightforward installation with standard tools, and the coarse UNC threading enhances grip in a variety of substrates, making these screws a reliable choice for machinery, enclosures, and structural components where vibration resistance and long-term integrity are critical.

Specification Summary & Compliance

This product features a 1/4"-20 UNC coarse thread with standard Class 2A tolerances for consistent fit. The screw is fully threaded with a blunt tip and measures 3/4" in length with a 0.473" pan head diameter. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring compliance with hazardous substance restrictions and supporting sustainable manufacturing practices.