S-91286A366 1/2"-13 x 8" 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 critical structural applications
- Superior corrosion resistance through zinc-flake coating, extending service life in harsh environments
- Optimized thread engagement with Class 2A UNC coarse threads ensuring reliable installation and vibration resistance
- Enhanced drive stability with external hex design providing maximum torque transmission during assembly
- Precision manufacturing meeting ASME B18.2.1 and SAE J429 standards for consistent quality and performance
- Reduced installation time with partially threaded design allowing for faster positioning and clamping
- Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value for heavy-duty industrial applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides reliable performance in high-stress environments including construction equipment, machinery frames, and structural steel connections. The zinc-flake coated finish offers superior corrosion protection compared to standard plating methods, significantly extending maintenance intervals in outdoor or chemically aggressive settings. The 1/2"-13 UNC coarse thread design ensures rapid installation and superior resistance to vibration loosening, while the partially threaded configuration allows for precise clamping force distribution. These industrial hex bolts are engineered to maintain integrity under extreme mechanical loads, making them ideal for critical fastening applications requiring long-term reliability.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with 1/2"-13 UNC coarse thread specifications. Complies with ASME B18.2.1 dimensional standards and SAE J429 material requirements for Grade 8 fasteners. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 8" overall length with 1 1/2" minimum thread length and 3/4" head width for standardized tool compatibility.
