S-90390A146 1/4"-20 x 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping design eliminates the need for pre-tapped holes, reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal.
• Zinc-plated steel construction provides excellent corrosion resistance, ensuring long-term reliability in demanding industrial environments.
• T27 Torx drive offers superior torque transmission and reduced cam-out, allowing for higher fastening force and preventing damage to the screw head.
• Type F thread cutting profile with coarse UNC threads ensures strong, secure fastening in a wide range of materials without stripping.
• 82° flat head with standard profile allows for a flush, countersunk finish, creating a smooth surface and improving aesthetic and functional assembly.
• Fully threaded shank maximizes grip and holding power along the entire length for a more secure and vibration-resistant connection.
• RoHS 3 compliance guarantees that these screws meet stringent environmental regulations, making them suitable for global industrial supply chains.

Professional Applications & Engineering Value

These 1/4-20 UNC thread cutting screws are engineered to solve common fastening challenges in metalworking and fabrication. The zinc-plated steel material provides a durable base with enhanced corrosion protection, essential for components exposed to harsh conditions. The Type F tapping screw design with a coarse thread and blunt tip is specifically optimized for creating strong threads in aluminum, brass, cast iron, and sheet metal, preventing material cracking and ensuring a tight, reliable hold. The combination of the T27 Torx drive and 82° countersink angle allows for high-torque installation and a clean, flush finish, reducing assembly time and improving the structural integrity of the final product. This makes them an indispensable industrial tapping screw for machinery, enclosures, and metal assemblies where vibration resistance and long-term performance are critical.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a standard Class 2A tolerance for reliable fit. The thread cutting (Type F) design conforms to industry standards for self-tapping fasteners. It is manufactured from steel with a zinc plating finish and is fully compliant with RoHS 3 (2015/863/EU) regulations, ensuring it is free of hazardous substances for safe industrial use.