S-91257A719 1/2"-13 x 4 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh industrial environments
- Optimized thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced durability from Rockwell C33 hardness providing excellent wear resistance and long service life
- Easy installation and removal with external hex drive design allowing for high torque application with standard tools
- Versatile partial threading enabling precise clamping force control across various material thicknesses
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and quality
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction machinery, heavy equipment assembly, and structural frameworks. The zinc yellow-chromate plated finish provides superior corrosion protection in challenging environments, while the 1/2"-13 UNC coarse threads with Class 2A fit ensure rapid installation and reliable vibration resistance. The partially threaded design allows for optimal clamp load distribution, making these steel fasteners ideal for critical joints where failure is not an option. With 4 1/4" length and external hex drive, they offer versatile solutions for thick material assemblies across manufacturing, automotive, and infrastructure projects.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit with 1/2"-13 UNC coarse threads and partial threading over minimum 1 1/4" length. Manufactured from high-strength steel with zinc yellow-chromate plating for corrosion protection. Fully compliant with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties for industrial applications. The inch system measurement guarantees compatibility with North American equipment and standards.
