S-91257A767 9/16"-12 x 2 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 demanding structural and machinery applications
- Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments
- Optimized torque transmission with external hex drive design enabling secure installation in high-vibration settings
- Reliable thread engagement through Class 2A thread fit ensuring consistent assembly precision
- Enhanced durability from Rockwell C33 hardness providing excellent resistance to wear and deformation
- Versatile partial threading allowing unthreaded shank sections for precise clamping in structural connections
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction equipment, machinery frames, and structural steel connections. The 9/16"-12 UNC coarse thread configuration provides superior resistance to vibration loosening while enabling faster installation in thick materials. The zinc yellow-chromate plating creates a protective barrier against corrosion in outdoor or chemically aggressive environments, significantly extending service life. With partial threading design, these fasteners maintain maximum strength in the unthreaded shank section while providing controlled clamping force. The external hex drive accommodates high torque applications common in maintenance, repair, and OEM equipment assembly, ensuring reliable performance under extreme mechanical stress.
Specification Summary & Compliance
This 2 1/2" length hex head screw features 9/16"-12 UNC coarse threads with Class 2A thread fit for precise dimensional accuracy. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring mechanical properties and dimensional consistency. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications with strict material restrictions.
