S-91257A769 9/16"-12 x 3" 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
- Maximum load-bearing capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc yellow-chromate plating in harsh industrial environments
- Enhanced durability with Rockwell C33 hardness to resist wear and deformation under stress
- Reliable thread engagement with Class 2A fit and UNC coarse threads for easier assembly and vibration resistance
- Optimized torque transmission through external hex drive design for secure installation with standard tools
- Versatile partial threading allowing both clamping and alignment functions in multi-material assemblies
- Industry compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in demanding industrial applications where failure is not an option. The zinc yellow-chromate plated steel construction provides critical corrosion resistance for machinery exposed to moisture, chemicals, or outdoor elements. The 9/16"-12 UNC coarse thread configuration ensures rapid assembly and maintains integrity in vibrating environments, while the partial threading design allows precise clamping force distribution across joint interfaces. These high-strength fasteners are engineered to solve common industrial challenges including structural fatigue, material compatibility issues, and maintenance frequency in heavy equipment, construction machinery, and transportation systems.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse thread profile (9/16"-12). Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety and restricted substance control.
