S-90273A535 1/4"-20 x 3/8" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Superior holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening in industrial applications
• Efficient installation featuring a Phillips No. 3 drive and fully threaded design for quick, secure assembly
• Flush surface finish with 82° countersink angle and undercut flat head profile for seamless integration
• Precise thread engagement with Class 2A thread fit and coarse UNC threading ensuring consistent performance
• Broad compatibility with standard 1/4"-20 UNC components for versatile industrial and construction use
• Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these zinc-plated steel flat head screws deliver exceptional performance where vibration resistance and durability are critical. The fully threaded design provides maximum grip length for secure fastening in machinery, equipment assembly, and construction projects. The 82° countersink angle and undercut flat head profile ensure flush mounting without protrusion, preventing snagging while maintaining structural integrity. With coarse UNC threading and Class 2A thread fit, these screws offer reliable engagement in various materials, reducing the risk of cross-threading during installation. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures these fasteners withstand heavy loads and repetitive stress in manufacturing, automotive, and building applications.

Specification Summary & Compliance

This 1/4"-20 UNC flat head screw features precise Class 2A thread fit tolerances and complies with ASME B18.6.3 manufacturing specifications. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. Additional specifications include right-hand thread direction, coarse thread spacing, and full threading along the 3/8" length, ensuring consistent performance across industrial applications.