S-91247A237 3/8"-24 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced Load Distribution with 120,000 psi tensile strength for reliable performance in high-stress environments
• Superior Corrosion Protection through zinc plating that extends service life in demanding industrial conditions
• Precise Thread Engagement with Class 2A UNF fine threads ensuring vibration-resistant connections
• Optimized Torque Transfer via external hex drive design for efficient installation and removal
• Controlled Fastening Application through partially threaded design that prevents over-tightening
• Consistent Mechanical Properties with Rockwell C25 hardness maintaining structural integrity under load
• Industry-Standard Compatibility meeting ASME B18.2.1 and SAE J429 specifications for universal application

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The 3/8"-24 UNF fine threading provides superior holding power in materials prone to stress cracking, while the zinc plated steel construction offers reliable corrosion protection in harsh environments. The partially threaded design ensures precise clamp load distribution, making it ideal for machinery assembly, structural framing, and equipment manufacturing where consistent fastening performance is critical. With its external hex drive and standardized dimensions, this fastener enables efficient installation in confined spaces while maintaining compatibility with existing tooling systems.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with UNF fine threading standards, this hex head screw ensures precise mechanical engagement. The fastener complies with ASME B18.2.1 dimensional specifications and SAE J429 material standards for Grade 5 classification. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to international substance restriction requirements. The 4½" length with 1" minimum thread length provides standardized dimensional consistency across industrial applications.