S-91247A771 9/16"-12 x 3 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 and Grade 5 classification for reliable performance in demanding applications
• Enhanced corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with UNC coarse spacing and Class 2A thread fit for faster assembly and vibration resistance
• Superior surface durability with Rockwell C25 hardness rating to maintain thread integrity under repeated stress
• Secure torque transmission via external hex drive and 13/16" head width for easy installation with standard tools
• Versatile partial threading design allowing for both clamping and alignment functions in structural applications
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical engineering solutions for heavy-duty industrial applications where reliable fastening is paramount. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures structural integrity in machinery assembly, construction frameworks, and equipment manufacturing. The zinc plated finish provides essential corrosion protection in environments exposed to moisture and chemicals, while the UNC coarse thread spacing enables rapid installation and superior resistance to vibration loosening. The partially threaded design offers precise clamping control, making it ideal for applications requiring both secure fastening and component alignment. These industrial hex bolts are engineered to maintain performance under sustained mechanical stress, reducing maintenance frequency and downtime in critical operations.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with 3 1/2" length and 9/16"-12 UNC thread specification. Features Class 2A thread fit tolerance for consistent engagement and right-hand thread direction. Complies with ASME B18.2.1 and SAE J429 manufacturing standards, ensuring dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for hazardous substance restrictions.