S-90471A455 3/8"-16 x 1 1/4" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• High-strength performance with 60,000 psi tensile strength and Rockwell B70 hardness for reliable, heavy-duty fastening
• Optimized flush mounting with standard 100° countersink angle and flat head design for seamless surface integration
• Efficient installation using common Phillips No. 4 drive for quick assembly and reduced tooling requirements
• Precise thread engagement with Class 2A fit UNC coarse threads ensuring consistent, vibration-resistant connections
• Full-threaded design providing maximum grip length and load distribution across the entire fastener
• Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3, REACH) for global supply chain compatibility

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical engineering solutions where surface flushness and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, machinery frames, and outdoor applications exposed to moisture and harsh conditions. The coarse UNC thread profile with Class 2A fit ensures rapid installation and reliable performance in materials where fine threads might strip or fail. The 100° countersink angle creates a secure, flush finish that eliminates protrusions in assembly components, while the Phillips drive offers familiar, efficient torque application. These fully threaded fasteners distribute clamping force evenly, making them ideal for securing metal brackets, structural panels, and heavy-duty enclosures where vibration resistance and long-term reliability are essential.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNC standards with precise dimensional control. Manufacturing follows ASME B18.6.3 specifications for flat head screw geometry and performance requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance. Threading is fully threaded UNC 3/8"-16 coarse pitch with standard right-hand direction for universal compatibility.