S-90471A416 1/4"-20 x 1" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments
• High tensile strength of 60,000 psi ensures reliable fastening under significant mechanical stress
• Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
• Standard 100° countersink angle allows for flush mounting, creating a smooth, professional finish
• Class 2A thread fit with UNC coarse spacing enables quick, easy assembly and secure holding power
• Fully threaded design offers maximum grip length and consistent clamping force across the entire shank
• Phillips No. 3 drive ensures efficient torque transfer and reduces cam-out during installation

Professional Applications & Engineering Value

Engineered for robust performance, these zinc-plated steel flat head screws address critical industrial fastening challenges. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures they withstand vibration and heavy loads in machinery, automotive assemblies, and construction applications. The fully threaded UNC coarse spacing with Class 2A fit provides rapid installation and superior pull-out resistance, while the 100° countersink angle creates seamless, aerodynamic surfaces in metal and wood components. Ideal for maintenance, repair, and OEM production where durability and regulatory compliance are paramount.

Specification Summary & Compliance

This 1/4"-20 x 1" flat head screw features precise Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. Manufactured in accordance with ASME B18.6.3 specifications, it guarantees consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in restricted substance-sensitive applications.