S-90729A511 5/16"-18 x 3/4" Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
• Superior thread engagement and reliability due to Class 3A thread fit, minimizing the risk of cross-threading and ensuring secure fastening
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Enhanced durability and surface protection from the passivated finish, which improves corrosion resistance and extends service life
• Optimal flush mounting with a 100° countersink angle and undercut flat head profile, providing a clean, recessed finish
• Efficient installation and removal using the 5/32" hex drive, allowing for high torque application without slippage
• Full thread coverage along the 3/4" length for maximum grip and load distribution in assembled components

Professional Applications & Engineering Value

Engineered for precision and longevity, this 5/16"-18 UNC Flat Head Screw in 316 Stainless Steel addresses critical challenges in industrial settings, such as corrosion from chemicals, saltwater, or high humidity. The Class 3A thread fit ensures tight tolerances and reliable performance in dynamic or vibrating machinery, reducing maintenance needs. Its passivated finish enhances the innate corrosion resistance of 316 stainless steel, making it suitable for marine, chemical processing, and food industry applications where hygiene and durability are paramount. The undercut flat head and 100° countersink angle allow for seamless integration into surfaces, preventing protrusion and improving aesthetic and functional assembly in equipment and structural frameworks.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 3A thread fit for precise dimensional accuracy. Manufacturing specifications include a right-hand thread, fully threaded design, and head diameter tolerance of -0.01" to 0". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global industrial use.