S-91247A110 5/16"-24 x 1 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with Grade 5 steel construction and 120,000 PSI tensile strength for reliable performance in demanding applications
• Enhanced corrosion resistance through zinc plating, extending service life in industrial environments
• Precise thread engagement with Class 2A fit and UNF fine threading for secure, vibration-resistant connections
• Easy installation and removal using standard tools thanks to the external hex drive and right-hand thread design
• Optimized strength-to-weight ratio with Rockwell C25 hardness, balancing durability and machinability
• Reduced assembly time with partially threaded shank design that simplifies alignment in pre-tapped holes
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This 5/16"-24 UNF hex head screw delivers exceptional engineering value in heavy-duty industrial applications where fastener reliability is critical. The Grade 5 steel construction provides the necessary structural integrity for machinery assembly, equipment frames, and structural supports, while the zinc plating offers essential corrosion protection in challenging environments. The UNF fine threading ensures superior vibration resistance compared to coarse threads, making these hex head screws ideal for precision equipment, automotive components, and manufacturing systems where loosening under dynamic loads is a concern. The external hex drive allows for high-torque installation, and the partially threaded design concentrates strength where needed most, solving common challenges of thread stripping and improper clamp load distribution in industrial fastening applications.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance according to UNF standards, ensuring consistent threading performance. Manufacturing specifications comply with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, confirming environmental safety and regulatory adherence for industrial use.