S-91253A800 5/8"-11 x 1 3/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Maximum torque transmission through 3/8" hex drive design, preventing tool slippage and ensuring secure installation
• Precision thread engagement with Class 3A fit for reliable, vibration-resistant fastening in critical applications
• Exceptional mechanical strength from alloy steel construction with 130,000 psi tensile strength and Rockwell C37 hardness
• Optimized flush mounting with standard 82° countersink angle for smooth surface finishing
• Enhanced load distribution through fully threaded design and coarse UNC thread pattern
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards

Professional Applications & Engineering Value

This 5/8"-11 UNC flat head hex screw delivers exceptional performance in heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The black-oxide alloy steel construction provides superior protection against corrosion while maintaining the high tensile strength required for demanding environments. The Class 3A thread fit ensures precise engagement with mating components, eliminating play and maintaining clamping force under dynamic loads. The 3/8" hex drive configuration enables high-torque installation without cam-out, making these industrial fasteners ideal for machinery assembly, structural steel connections, and equipment manufacturing where reliability cannot be compromised. The combination of coarse thread spacing and full threading provides excellent holding power in both metallic and high-density materials.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 3A thread tolerance for precision fit. The UNC coarse thread specification (5/8"-11) ensures rapid installation and superior resistance to vibration loosening. Compliant with ASME B18.3 dimensional standards and ASTM F835 mechanical property requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions.