S-91257A690 7/16"-14 x 5 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
- Maximum load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring reliable installation and vibration resistance
- Enhanced durability from Rockwell C33 hardness that maintains fastener integrity under repeated stress
- Secure torque application via external hex drive design that prevents tool slippage during high-tension fastening
- Versatile partial threading allowing both clamping force and alignment flexibility in assembled components
- Regulatory compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws solve critical fastening challenges in construction, machinery assembly, and structural frameworks. The 7/16"-14 UNC coarse thread design provides excellent engagement in both metals and composite materials, while the partial threading configuration allows for precise clamp load distribution. The zinc yellow-chromate plating delivers superior corrosion resistance in outdoor or chemically aggressive environments, significantly extending service life. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme vibration and dynamic loading conditions, making them ideal for high-stress applications where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (7/16"-14) and 5 1/2" length with minimum 1 1/8" thread length. These steel hex head screws comply with ASME B18.2.1 mechanical specifications and maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.
