S-91247A513 7/8"-14 x 5" 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 demanding applications
- Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNF fine threading ensuring secure fastening and vibration resistance
- Optimized strength-to-weight ratio from Grade 5 steel construction with Rockwell C25 hardness
- Easy installation and removal with standard external hex drive and 1 5/16" head width for common tool compatibility
- Versatile partial threading design providing both gripping strength and clearance where needed
- Regulatory compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
This 7/8"-14 UNF hex head screw delivers critical engineering solutions for heavy-duty industrial applications where joint integrity is paramount. The Grade 5 steel construction combined with zinc plating provides exceptional corrosion resistance in manufacturing, construction, and machinery assembly environments. The UNF fine threading offers superior vibration resistance compared to coarse threads, making it ideal for equipment subject to dynamic loads. With partial threading and 5" length, this fastener provides optimal clamp force distribution while allowing clearance in non-threaded sections. The external hex drive design ensures compatibility with standard tools, streamlining installation in confined spaces common in industrial settings.
Specification Summary & Compliance
This hex head screw features Class 2A thread fit per UNF standards with precise 7/8"-14 fine threading and 2" minimum thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 5 requirements, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial use.
