S-91286A357 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 capacity with 150,000 psi tensile strength, ideal for high-stress structural connections.
- Superior corrosion resistance from zinc-flake coating, extending service life in harsh industrial environments.
- Reliable thread engagement with Class 2A fit and coarse UNC threading, ensuring easy installation and vibration resistance.
- High-strength Grade 8 classification and Rockwell C33 hardness for durable, fatigue-resistant performance.
- Optimized for heavy torque application through external hex drive and 3/4" head width, providing secure fastening.
- Versatile partial threading design allowing combined clamping and unthreaded shank benefits.
- Compliance with major industrial standards including ASME B18.2.1 and SAE J429, guaranteeing interoperability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw delivers critical reliability where failure is not an option. The zinc-flake coated steel construction combats corrosion in manufacturing plants, construction sites, and machinery assembly, reducing maintenance frequency. Its 1/2"-13 UNC coarse thread and Class 2A thread fit enable rapid installation with standard tools while maintaining grip under dynamic loads. The partially threaded 6" design provides an unthreaded shank for shear strength, making it ideal for securing structural members, heavy equipment frames, and high-vibration machinery where both clamping force and alignment stability are paramount.
Specification Summary & Compliance
This fastener adheres to ASME B18.2.1 and SAE J429 Grade 8 specifications, with precise Class 2A thread fit and UNC coarse threading. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Dimensions include 1/2"-13 thread size, 6" length, and 3/4" hex head width, manufactured to industrial-grade tolerances for consistent performance.
