S-90585A061 3/8"-16 x 1 1/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
• High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and vibration
• Precision Class 3A thread fit provides secure engagement and reduces the risk of cross-threading during installation
• Passivated finish enhances surface durability and extends service life by preventing oxidation
• 82° countersink angle and flat head design allows for flush mounting, improving aesthetics and safety in assembled products
• Hex drive (7/32") offers efficient torque application and reduces tool slippage in high-torque scenarios
• Full threading along the 1-1/8" length maximizes grip range and adjustability in various material thicknesses

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 3/8"-16 UNC flat head screws address critical challenges in machinery assembly, marine equipment, and chemical processing systems. The 316 Stainless Steel material provides exceptional resistance to pitting and crevice corrosion, while the coarse UNC thread ensures quick installation and reliable holding power in soft metals or plastics. The combination of Rockwell B55 hardness and 70,000 psi tensile strength prevents stripping and deformation under dynamic loads, making these fully threaded fasteners a trusted solution for structural applications where vibration resistance and long-term integrity are paramount. The passivated finish further safeguards against environmental degradation, supporting compliance with stringent industry standards.

Specification Summary & Compliance

This product adheres to ASME B18.3 specifications for dimensional accuracy, including Class 3A thread fit tolerances and standardized 82° countersink angle. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. The screw features UNC coarse threading with precise diameter control, supporting consistent performance in industrial fastener systems.