S-91257A722 1/2"-13 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 reliable performance in heavy-duty applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Optimized torque transmission with external hex drive design and 3/4" head width for secure installation
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening in various materials
- Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Versatile partial threading allowing both clamping and alignment functions in assembly applications
- Regulatory compliance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where structural integrity cannot be compromised. The 1/2"-13 UNC coarse thread configuration provides excellent pull-out resistance in steel frameworks, machinery bases, and construction equipment. The zinc yellow-chromate plating creates a protective barrier against oxidation and chemical exposure in industrial environments, while the partially threaded design allows for precise clamping force distribution. With 150,000 psi tensile strength and Rockwell C33 hardness, these industrial fasteners withstand extreme vibration and dynamic loading in heavy machinery, transportation equipment, and structural steel connections where failure is not an option.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse threading and 2 1/2" length. These hex head screws conform to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring verified material safety and performance standards.
