S-91253A767 1/2"-13 x 11" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments.
• Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress applications, preventing fastener failure.
• Rockwell C39 hardness provides excellent wear resistance and durability under heavy loads.
• Class 3A thread fit offers tighter tolerances for secure, precise mating with nuts and tapped holes, reducing the risk of loosening.
• Partially threaded design allows for effective clamping where full threading isn't required, improving joint stability.
• 5/16" hex drive enables high-torque installation with standard tools, speeding up assembly and reducing labor time.
• Compliance with ASTM F835, RoHS 3, and REACH ensures material quality and environmental safety, meeting global regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel flat head screw is engineered to address critical challenges in heavy machinery, structural frameworks, and industrial equipment assembly. The UNC coarse thread and Class 3A fit provide rapid installation and vibration resistance, minimizing maintenance needs in dynamic environments. Its partially threaded shank concentrates clamping force effectively, preventing joint slippage in applications like construction and automotive manufacturing. The black-oxide surface treatment not only enhances corrosion resistance but also reduces galling, making it ideal for outdoor or chemically exposed settings. With a high tensile strength of 130,000 psi, it reliably supports load-bearing structures, ensuring long-term operational safety and reducing downtime for replacements.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC coarse threading with a Class 3A thread fit for superior accuracy. It meets the ASTM F835 specification for mechanical properties and is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for industrial use globally.