S-91247A781 9/16"-12 x 6" 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 for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating that extends service life in harsh industrial environments
• Optimized thread engagement with coarse UNC threading for faster installation and reduced cross-threading risk
• Precise mechanical properties backed by Rockwell C25 hardness for consistent durability and wear resistance
• Secure fastening performance with Class 2A thread fit ensuring proper mating with nuts and threaded components
• Enhanced torque transmission through external hex drive design for efficient installation with standard tools
• Versatile partial threading allowing both clamping and alignment functions in structural assemblies

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for industrial applications requiring high tensile strength and reliable fastening. The zinc plated steel construction provides essential corrosion protection in manufacturing facilities, construction sites, and machinery assembly where environmental exposure is a concern. The coarse UNC threading enables rapid installation in structural steel connections, equipment frames, and heavy machinery while minimizing the risk of thread damage. With partial threading and external hex drive, this fastener offers optimal performance in applications requiring both precise alignment and high clamping force. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures dependable performance in vibration-prone environments, making it ideal for automotive assemblies, industrial equipment, and structural steel connections where failure is not an option.

Specification Summary & Compliance

This heavy-duty fastener maintains Class 2A thread fit tolerance for consistent mating with standard nuts and threaded components. Manufactured to meet ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications. The 9/16"-12 UNC coarse thread configuration provides reliable performance in accordance with established industrial standards.