S-91253A166 6-32 x 9/16" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for reliable performance in demanding industrial environments
• Superior thread engagement with Class 3A fit ensuring precise, vibration-resistant connections in critical assemblies
• Maximum driving torque capability through hex drive design preventing cam-out and tool slippage during installation
• Enhanced structural integrity with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Optimized flush mounting with 82° countersink angle providing smooth surface finishes in countersunk holes
• Reliable environmental compliance meeting RoHS 3 and REACH standards for global manufacturing requirements
• Improved installation efficiency with coarse UNC threads enabling faster assembly in various materials

Professional Applications & Engineering Value

These 6-32 UNC flat head screws deliver exceptional engineering value in industrial fastening applications where flush surface mounting and high tensile strength are critical. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the mechanical properties needed for demanding environments. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of vibration-induced loosening in machinery, automotive, and electronic assemblies. The hex drive system allows for higher torque application compared to traditional screw drives, making them ideal for applications requiring secure fastening in confined spaces. With fully threaded design and coarse thread spacing, these screws offer rapid installation and reliable holding power across various material thicknesses.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNC coarse thread profile, these screws meet ASTM F835 specifications for mechanical properties and performance standards. The 82° countersink angle conforms to industry standards for flush mounting applications. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring suitability for global manufacturing and export requirements. The combination of 130,000 psi tensile strength and Rockwell C39 hardness provides reliable performance in high-stress applications while maintaining consistent thread integrity.