S-91253A818 5/8"-11 x 7" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior load-bearing capacity from 130,000 psi tensile strength alloy steel construction
• Precision thread engagement with Class 3A fit for vibration resistance and reliable fastening
• Optimized drive efficiency through 3/8" hex drive design preventing tool slippage
• Flush surface finishing enabled by 82° countersink angle and standard flat head profile
• Reduced installation time with coarse UNC threading and partial threading design
• Long-term reliability backed by Rockwell C37 hardness for wear resistance

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws solve critical challenges in structural assembly and machinery manufacturing. The 5/8"-11 UNC coarse thread configuration ensures rapid installation in steel frameworks while maintaining vibration-resistant performance under dynamic loads. The partially threaded design concentrates engagement where clamping force matters most, preventing joint loosening in conveyor systems, heavy equipment, and structural steel connections. The black-oxide surface treatment provides essential corrosion protection in manufacturing facilities and outdoor installations, while the 82° countersink angle guarantees flush mounting in precision-machined components.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with Class 3A thread fit ensuring precision tolerance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features UNC coarse thread spacing with right-hand thread direction in inch system measurements. Mechanical properties include Rockwell C37 hardness and 130,000 psi tensile strength for guaranteed performance in industrial fastening applications.