S-91255A165 8-32 x 9/16" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Superior mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance under high stress
• Precision thread engagement with Class 3A fit ensuring secure fastening and vibration resistance in critical applications
• Optimized installation efficiency through hex drive design and fully threaded construction for quick, secure assembly
• Enhanced durability from alloy steel construction maintaining integrity in high-torque and repetitive applications
• Wide compatibility with UNC coarse threading system for versatile use across industrial equipment and machinery
• Regulatory compliance assurance meeting ASME B18.3 and ASTM F835 standards for quality and safety

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel screws provide critical solutions for machinery assembly, automotive components, and heavy equipment manufacturing. The Class 3A thread fit ensures precise engagement with mating components, eliminating play and reducing vibration-induced loosening in dynamic environments. The rounded head design with hex drive offers superior torque transmission during installation while maintaining a low-profile appearance. With coarse UNC threading and full threading along the 9/16" length, these fasteners deliver rapid installation and maximum grip length in various material thicknesses. The combination of 120,000 psi tensile strength and Rockwell C39 hardness makes them ideal for applications requiring repeated disassembly and reassembly without compromising thread integrity.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit per UNC specifications, ensuring consistent performance across applications. Complies with ASME B18.3 for dimensional requirements and ASTM F835 for mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. The black-oxide surface treatment provides corrosion protection while maintaining dimensional accuracy for reliable fastening performance.