S-91253A628 3/8"-16 x 1 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating on alloy steel, ideal for harsh industrial environments
• Superior load-bearing capacity from 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections in critical assemblies
• Efficient installation using standard 7/32" hex drive tools, reducing assembly time and labor costs
• Flush surface finish with 82° countersink angle and flat head design for streamlined, snag-free installations
• Full thread coverage along the 1-1/2" length provides maximum grip strength and uniform stress distribution
• Regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 3/8"-16 UNC flat head screws deliver critical performance where vibration resistance and structural integrity are paramount. The black-oxide alloy steel construction provides enhanced corrosion protection in manufacturing equipment, machinery frames, and automotive assemblies, while the coarse UNC threading ensures rapid installation and superior holding power in soft materials or high-vibration environments. The combination of Class 3A thread fit and fully threaded design eliminates loosening under dynamic loads, making these hex drive screws ideal for heavy-duty fastening applications requiring precise alignment and long-term reliability. The 82° countersink angle facilitates flush mounting in precision-machined components, reducing protrusion-related hazards in automated systems.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread profile (3/8"-16). Compliant with ASME B18.3 dimensional specifications and ASTM F835 mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. Inch system measurements ensure compatibility with North American industrial equipment and tooling standards.