S-91257A736 1/2"-13 x 6" 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 capability with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in demanding environments
- Optimized torque transmission through external hex drive design for secure installation and removal
- Enhanced mechanical properties from Grade 8 classification and Rockwell C33 hardness for consistent durability
- Precision thread engagement with Class 2A UNC coarse threads ensuring proper fit and vibration resistance
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and safety
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where structural integrity is paramount. The 1/2"-13 UNC coarse thread configuration provides superior holding power in steel-to-steel connections, while the zinc yellow-chromate plating offers critical corrosion protection in manufacturing, construction, and machinery applications. The partially threaded design allows for precise clamping force distribution, making these external hex drive fasteners ideal for structural frameworks, heavy equipment assembly, and industrial machinery where vibration resistance and long-term reliability are essential. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures these screws maintain integrity under extreme mechanical stresses.
Specification Summary & Compliance
This 6-inch hex head screw features precise Class 2A thread fit with 1/2"-13 UNC coarse threading and 1 1/4" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for safe and sustainable industrial components.
