S-91268A821 5/8"-11 x 4 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 industrial environments
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life under repetitive loading conditions
- Optimized thread engagement through UNC coarse threading and Class 2A fit, enabling faster assembly and reduced cross-threading risks
- Secure torque transmission via external hex drive design, providing positive grip with standard wrenching tools
- Versatile partial threading allowing both clamping and alignment functions in structural and machinery applications
- Regulatory compliance assurance meeting ASME B18.2.1 specifications while adhering to RoHS 3 and REACH environmental standards
- Corrosion-resistant steel construction maintaining structural integrity in demanding operating conditions
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The 5/8"-11 UNC coarse thread configuration provides superior resistance to vibration loosening while facilitating rapid installation in structural steel, heavy machinery, and construction equipment. The partially threaded design creates an optimal balance between shear strength and clamping force, making these steel fasteners ideal for bolted connections requiring precise alignment. With 150,000 PSI tensile strength and Rockwell C33 hardness, they effectively address common engineering challenges including dynamic loading, thermal cycling, and long-term structural stability in industrial settings.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 standards with SAE J429 Grade 8 certification, these hex head screws feature precise Class 2A thread fit tolerances for consistent engagement. The 5/8"-11 UNC coarse thread maintains proper clearance while the 4 1/2" length with 1 1/2" minimum thread length ensures sufficient grip range. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental responsibility without compromising mechanical performance.
