S-91253A669 7/16"-14 x 1" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Superior load-bearing capability with 130,000 psi tensile strength for heavy-duty applications requiring maximum reliability
• Precision thread engagement with Class 3A fit ensuring secure fastening and vibration resistance in critical assemblies
• Optimized flush mounting with 82° countersink angle providing smooth surface finish and improved aerodynamics
• Enhanced installation efficiency through 1/4" hex drive design allowing high-torque application without cam-out
• Full-thread engagement along the entire 1" length for maximum grip strength and distribution of clamping force
• Industry-standard compliance meeting ASME B18.3 and ASTM F835 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

This black-oxide alloy steel flat head screw delivers critical performance advantages for industrial applications where high tensile strength and corrosion resistance are paramount. The 7/16"-14 UNC coarse thread spacing provides rapid installation in heavy machinery, automotive assemblies, and structural frameworks, while the Class 3A thread fit ensures precise engagement that resists loosening under vibration. The 82° countersink angle creates a flush surface ideal for aerospace components, precision equipment, and applications requiring aerodynamic profiles. Engineered with Rockwell C39 hardness, this fully threaded hex drive screw maintains integrity in high-stress environments, solving common failure points in industrial fastening systems.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 3A thread fit tolerance per UNC standards. Complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for restricted substances. The black-oxide alloy steel construction provides consistent performance across the specified 1" length with coarse thread spacing optimized for industrial applications.