S-91257A725 1/2"-13 x 3 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 demanding applications
- Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh industrial environments
- Optimized torque transmission with external hex drive design ensuring secure installation and removal
- Enhanced thread engagement control through partial threading that provides precise clamping force distribution
- Guanteed mechanical properties meeting Grade 8 standards with Rockwell C33 hardness for consistent performance
- Wide compatibility with UNC coarse threads (1/2"-13) that resist loosening under vibration
- Regulatory compliance assurance with RoHS 3 and REACH standards for global market acceptance
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc yellow-chromate plated steel construction provides superior protection against environmental degradation, making these industrial screws ideal for heavy machinery, structural assemblies, and construction applications. The partial threading design ensures optimal stress distribution while the coarse UNC threads maintain secure fastening in high-vibration environments. With external hex drive compatibility, these heavy-duty fasteners offer reliable installation using standard tools, reducing assembly time and maintenance costs in industrial settings.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse threads and partial threading up to 1 1/4" minimum thread length. These hex head screws comply with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict regulatory adherence.
