S-91247A810 5/8"-11 x 4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 120,000 psi tensile strength and Grade 5 classification for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and easier installation
• Enhanced torque transmission via external hex drive design providing superior grip and preventing tool slippage
• Controlled partial threading allowing precise clamping force distribution across connected materials
• Consistent mechanical properties with Rockwell C25 hardness maintaining dimensional stability under stress
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3 and REACH standards for global acceptance

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where joint integrity is paramount. The zinc plated steel construction provides essential corrosion protection in manufacturing facilities, construction sites, and equipment assembly environments. The 5/8"-11 UNC coarse thread configuration enables rapid installation while maintaining vibration resistance, particularly valuable in structural frameworks and machinery where external hex drive accessibility is required. With partial threading optimizing stress distribution, this fastener prevents material deformation in stacked assemblies while the 4" length accommodates substantial material thicknesses. The combination of 120,000 psi tensile strength and controlled hardness makes these hex head screws ideal for load-critical connections in construction, transportation equipment, and industrial machinery where failure is not an option.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance ensuring consistent engagement. Thread specifications conform to UNC coarse thread standards with 5/8"-11 configuration. Full compliance with ASME B18.2.1 and SAE J429 manufacturing specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for restricted substances.