S-91247A770 9/16"-12 x 3 1/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior load-bearing capacity with Grade 5 steel construction and 120,000 psi tensile strength for demanding industrial applications
- Enhanced corrosion resistance through zinc plating, extending service life in harsh environments
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Optimized torque transmission via external hex drive and 13/16" head width for secure installation
- Reduced material stress concentration through partial threading design below the 23/64" high hex head
- Simplified inventory management with compliance to ASME B18.2.1 and SAE J429 manufacturing standards
- Environmental regulation compliance meeting RoHS 3 and REACH requirements for global supply chain integration
Professional Applications & Engineering Value
This 9/16"-12 UNC Grade 5 zinc plated hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment assembly. The coarse thread design provides superior resistance to vibration loosening while the Rockwell C25 hardness maintains structural integrity under repeated loading cycles. The partial threading configuration concentrates tensile strength where needed most, preventing thread stripping in soft materials. Zinc plating creates a sacrificial barrier against oxidation, making these external hex drive fasteners ideal for outdoor infrastructure, agricultural equipment, and manufacturing plants where environmental exposure compromises ordinary fasteners. The 3 1/4" length with 1 3/8" minimum thread engagement ensures secure clamping in thick-section assemblies.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances per UNC standards with 9/16"-12 coarse thread specification. Complies with ASME B18.2.1 dimensional requirements and SAE J429 Grade 5 mechanical properties including 120,000 psi tensile strength. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for hazardous substance restrictions.
