S-90124A344 1/2"-13 x 4 1/2" ASME B18.2.1, SAE J429 Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with 120,000 psi tensile strength, ideal for high-stress industrial assemblies
• Superior corrosion resistance through zinc plating, extending service life in demanding environments
• Reliable fastening performance with Rockwell C25 hardness, resisting deformation under torque
• Efficient installation using external hex drive and 3/4" head width for secure tool engagement
• Optimized thread engagement with UNC coarse threading and Class 2A fit, reducing cross-threading risks
• Versatile partial threading design allowing unthreaded shank sections for precise clamping applications
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The zinc-plated steel construction provides essential corrosion protection in manufacturing facilities and outdoor applications, while the coarse UNC threading ensures rapid installation and vibration resistance in high-vibration environments. The partially threaded design allows the unthreaded shank to bear shear loads directly, preventing joint loosening in dynamic applications. With external hex drive compatibility, maintenance crews can achieve proper torque values using standard tools, reducing installation time and improving workplace safety across construction, automotive, and industrial maintenance sectors.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with 1/2"-13 UNC coarse threading and 4 1/2" length. Complies with ASME B18.2.1 and SAE J429 Grade 5 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for industrial use.