S-90390A116 1/4"-20 x 4 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior thread cutting performance with Type F tapping design eliminates the need for pre-tapped holes, reducing installation time and labor costs
• Enhanced corrosion resistance through black-phosphate steel coating extends service life in demanding industrial environments
• High-torque T30 Torx drive system provides superior cam-out resistance and precise installation control compared to traditional drive types
• 82° countersink angle ensures flush mounting in various materials while maintaining structural integrity
• 1/4"-20 UNC coarse threading delivers excellent holding power in aluminum, brass, cast iron, and sheet metal applications
• Full threading along the 4 1/2" length provides maximum engagement strength and uniform stress distribution
• Standard flat head design allows for seamless surface finishing and improved aesthetic appearance

Professional Applications & Engineering Value

These heavy-duty tapping screws are engineered specifically for challenging industrial fastening applications where reliable thread formation is critical. The black-phosphate steel construction combined with Type F thread cutting design solves common installation challenges in aluminum, brass, cast iron, and sheet metal by creating precise mating threads during installation. The T30 Torx drive system addresses torque transfer issues common in high-stress applications, preventing tool slippage and ensuring consistent clamping force. The 82° countersink angle and flat head profile provide optimal surface contact, distributing load evenly while maintaining flush mounting in structural assemblies. These thread cutting screws are particularly valuable in manufacturing, construction, and metal fabrication where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards with UNC coarse thread specifications and Class 2A thread tolerance for consistent performance. The screws feature right-hand threading and fully threaded shank design with 0.25" thread diameter and 4 1/2" overall length. Compatible with No. 1 drill bit (0.228" diameter) for proper hole preparation. These Type F tapping screws comply with industry standards for thread cutting fasteners and are manufactured using RoHS and REACH compliant materials and processes suitable for industrial and construction applications.