S-90410A320 1/4"-20 x 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Self-tapping efficiency – Cuts precise threads in brass, cast iron, and sheet metal without pre-threading, reducing installation time and labor.
• Corrosion-resistant 410 Stainless Steel – Provides reliable performance in demanding environments, minimizing rust and extending service life.
• Secure Phillips No. 3 drive – Ensures positive engagement with standard tools, reducing cam-out risk and improving torque transfer.
• Coarse UNC 1/4"-20 thread – Delivers faster driving and stronger holding power in softer materials and sheet metal applications.
• Fully threaded design – Maximizes grip along the entire shank for uniform load distribution and enhanced pull-out resistance.
• Optimized pan head with 0.492" diameter – Offers a low-profile, rounded bearing surface that sits flush and resists surface marring.
• Compliant with RoHS 3 & REACH – Meets stringent environmental and safety standards for use in regulated industries and global markets.

Professional Applications & Engineering Value

This 1/4"-20 UNC thread cutting screw is engineered to solve common fastening challenges in metalworking and assembly. The 410 Stainless Steel construction resists oxidation and wear, making it ideal for components exposed to moisture or mechanical stress. Its thread-cutting (Type F) design eliminates the need for separate tapping operations in brass, cast iron, and sheet metal, reducing production steps and preventing material fatigue. The coarse thread spacing ensures rapid installation and high resistance to vibration loosening, while the Phillips pan head provides a clean, low-profile finish that is easy to drive with common industrial drivers. These features collectively enhance assembly speed, reduce total cost of ownership, and improve joint integrity in HVAC, machinery, and fabricated metal products.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 2A fit for consistent engagement. Dimensions include a head diameter of 0.492", length of 1/2", and is fully threaded with a blunt tip. It is designed for use with a No. 7 drill bit (0.201" diameter) for optimal thread formation. Manufactured in accordance with industry standards for thread cutting tapping screws, it is verified to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and health regulations.