S-90273A439 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, ensuring long-term reliability in demanding industrial environments.
• High tensile strength of 60,000 psi provides exceptional load-bearing capacity for heavy-duty fastening applications.
• Rockwell B70 hardness offers excellent wear resistance and durability, reducing the risk of stripping or deformation.
• Fully threaded design with Class 2A fit ensures consistent engagement and secure fastening across various materials.
• Standard 82° countersink angle allows for a flush, professional finish that minimizes protrusion and snagging hazards.
• Phillips drive (No. 4 size) facilitates efficient installation with common tools, improving assembly speed and reducing labor costs.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for global supply chain compatibility.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered to address critical fastening challenges in industrial settings. The zinc-plated steel material provides a protective barrier against rust and corrosion, making it ideal for machinery, automotive assemblies, and outdoor equipment where exposure to moisture or chemicals is a concern. The coarse thread spacing and right-hand thread direction enable quick installation and high resistance to vibration loosening, reducing maintenance needs in dynamic applications. With a fully threaded design and standard flat head profile, it ensures maximum grip strength and a seamless finish when countersunk, preventing surface damage and improving aesthetic integration. These features make it a reliable choice for industrial fastening solutions that demand precision, strength, and long-term performance under stress.

Specification Summary & Compliance

This screw features a 1 1/4" length with Class 2A thread fit for precise dimensional accuracy per UNC standards. It meets ASME B18.6.3 specifications for mechanical and dimensional requirements, ensuring consistent quality and interoperability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting sustainable procurement practices.