S-91253A894 7/8"-9 x 2 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 130,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in industrial environments
• Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance in critical assemblies
• High-torque installation capability through the 9/16" hex drive design, preventing tool slippage during tightening
• Optimized material hardness at Rockwell C37 maintains structural integrity under repeated stress and heavy loads
• Full threading design provides maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance assurance meeting ASTM F835 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 7/8"-9 UNC flat head screws deliver critical engineering solutions for industrial applications requiring high-strength fastening with precise countersinking. The black-oxide alloy steel construction provides superior corrosion protection in harsh environments, while the coarse UNC thread design ensures rapid installation and reliable performance in structural steel connections, heavy machinery, and industrial equipment assemblies. The fully threaded configuration maximizes clamping force distribution, making these hex drive screws ideal for applications where vibration resistance and consistent preload maintenance are essential. The 82° countersink angle provides flush mounting in standard chamfered holes, creating seamless surface finishes in critical industrial components and structural frameworks.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit for superior engagement and UNC coarse thread spacing (9 threads per inch). This heavy-duty fastener meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 2-1/2" length and standardized 82° flat head profile ensure compatibility with industry-standard installation requirements and chamfered hole preparations.