S-91247A505 7/8"-14 x 3" 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 capability with 120,000 psi tensile strength for demanding industrial applications
- Enhanced corrosion resistance through zinc plating, extending service life in harsh environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure, vibration-resistant connections
- Optimized torque transmission via external hex drive and large 1 5/16" head for efficient installation
- Reliable material performance from Grade 5 steel hardened to Rockwell C25 for consistent durability
- Versatile partial threading allowing both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME B18.2.1 standards and environmental directives
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and vibration resistance are paramount. The 7/8"-14 UNF fine threading provides superior thread engagement in tapped holes, reducing the risk of loosening under dynamic loads. The zinc plated finish creates a protective barrier against oxidation and corrosion in demanding environments. With partial threading design, it offers both clamping force in the threaded section and smooth shank alignment, making it ideal for structural steel connections, heavy equipment manufacturing, and industrial machinery assembly where precision and reliability are non-negotiable.
Specification Summary & Compliance
This 3" hex head screw features precise Class 2A thread fit with 7/8"-14 UNF fine threading and 2" minimum thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 5 requirements, it delivers consistent dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets while maintaining 120,000 psi tensile strength and Rockwell C25 hardness for reliable performance in critical applications.
