S-91247A775 9/16"-12 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength, ideal for heavy-duty structural applications
• Superior corrosion resistance through zinc plating, extending service life in demanding environments
• Reliable thread engagement with UNC coarse threading and Class 2A fit for secure fastening in various materials
• Optimized torque transmission via external hex drive and 13/16" head width for efficient installation
• Enhanced mechanical durability from Rockwell C25 hardness, resisting deformation under stress
• Versatile partial threading allowing unthreaded shank sections for precise clamp load distribution
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical performance in industrial assemblies where vibration resistance and structural integrity are paramount. The zinc-plated steel construction provides essential corrosion protection for machinery, construction equipment, and automotive components exposed to harsh conditions. Its UNC coarse threads enable rapid installation in castings and structural steel while maintaining Class 2A fit precision. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening in dynamic load applications. Engineered to ASME B18.2.1 and SAE J429 specifications, this fastener ensures reliable performance in critical connections from conveyor systems to heavy equipment frames.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with 9/16"-12 UNC coarse threading and 4 1/2" length. Complies with ASME B18.2.1 dimensional standards and SAE J429 Grade 5 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for industrial distribution.