S-91257A683 7/16"-14 x 3 1/2" 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 extends service life in harsh environments
- Optimized installation torque transfer with external hex drive design preventing tool slippage during assembly
- Enhanced thread engagement control through partial threading that allows precise clamping force distribution
- Consistent dimensional accuracy with Class 2A thread fit ensuring predictable assembly and interchangeability
- Maximum hardness durability at Rockwell C33 providing excellent wear resistance against vibration and impact
- Regulatory compliance assurance meeting both performance standards and environmental regulations for global projects
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The 7/16"-14 UNC coarse thread configuration provides superior resistance to vibration loosening in machinery, construction equipment, and transportation systems. The zinc yellow-chromate plated surface treatment creates a protective barrier against chemical exposure and atmospheric corrosion, significantly extending maintenance intervals in outdoor or chemically aggressive environments. With partial threading design, these fasteners concentrate clamping force precisely where needed, preventing joint failure in critical assemblies while the external hex drive ensures maximum torque application without cam-out during high-tension installations.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent assembly performance. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring suitability for regulated industrial applications worldwide.
