S-91247A420 9/16"-18 x 6" 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
- Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through zinc plating, extending service life in demanding environments
- Precise thread engagement with Class 2A fit and UNF fine threading for vibration-resistant connections
- Optimized torque transmission through external hex drive design and 13/16" head width
- Controlled thread engagement with partial threading to prevent over-tightening and material stress
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for consistent quality
- Enhanced durability with Rockwell C25 hardness providing excellent wear resistance
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for industrial assemblies requiring high tensile strength and reliable fastening. The 9/16-18 UNF fine threading provides superior resistance to vibration loosening in machinery, automotive, and structural applications. The zinc plated finish offers essential corrosion protection for equipment operating in challenging environments, while the partially threaded design ensures precise clamping force distribution. With external hex drive and substantial 6" length, this fastener enables efficient installation in deep-set applications where standard fasteners fall short, making it ideal for heavy-duty construction, manufacturing equipment, and industrial maintenance where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF fine thread specification (9/16-18). Complies with ASME B18.2.1 and SAE J429 Grade 5 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features Rockwell C25 hardness and 120,000 psi tensile strength as specified for Grade 5 fasteners.
