S-91247A918 1"-8 x 3 1/2" 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
- Optimized thread engagement with Class 2A thread fit ensuring consistent assembly and vibration resistance
- Enhanced installation efficiency through coarse UNC threading and external hex drive for quick fastening
- Proven durability with Rockwell C25 hardness maintaining structural integrity under repeated stress
- Versatile partial threading design allowing both secure clamping and adjustable positioning capabilities
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interoperability
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The 1"-8 UNC coarse threading combined with partial threading design prevents loosening in high-vibration environments while allowing precise adjustment in assembly operations. The zinc plated steel construction provides essential corrosion protection for machinery, structural frameworks, and equipment subjected to demanding operational conditions. With its external hex drive and right-hand thread configuration, this fastener enables efficient installation in confined spaces while maintaining the high tensile strength required for critical connections in construction, manufacturing, and heavy equipment applications.
Specification Summary & Compliance
This 3 1/2" length hex head screw features precise Class 2A thread fit tolerances and 1"-8 UNC coarse threading manufactured to ASME B18.2.1 and SAE J429 standards. The fastener maintains dimensional accuracy with 39/64" head height and 1 1/2" head width for consistent performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are met for global industrial applications.
