S-91247A783 9/16"-12 x 6 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi provides reliable load-bearing capacity for demanding industrial applications
• Superior corrosion resistance through zinc plating extends service life in harsh environments
• Rockwell C25 hardness ensures excellent durability and resistance to wear and deformation
• Coarse UNC thread design enables faster installation and better performance in softer materials
• External hex drive with 13/16" head width delivers secure tool engagement and high torque capability
• Class 2A thread fit guarantees proper mating with standard nuts while allowing for manufacturing tolerances
• Partially threaded design provides unthreaded shank for enhanced shear strength where needed

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value for heavy-duty industrial applications requiring reliable fastening under substantial loads. The zinc plated steel construction provides critical corrosion protection in manufacturing environments, warehouses, and outdoor equipment where moisture exposure is a concern. The 9/16"-12 UNC coarse thread configuration ensures rapid installation in structural steel, machinery frames, and construction projects while maintaining 120,000 psi tensile strength for load-critical connections. The external hex drive with substantial 13/16" head width allows for high torque application without stripping, making it ideal for maintenance, repair, and assembly operations where access may be limited. The partially threaded design offers superior resistance to vibration and shear forces in demanding applications from heavy equipment to structural frameworks.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNC standards, ensuring proper engagement with mating components while accommodating manufacturing variations. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, guaranteeing dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial supply chains. The inch system measurement provides 6½" total length with 1⅝" minimum thread engagement for secure fastening performance.