S-91286A313 7/16"-20 x 4" 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 high-stress applications
- Superior corrosion resistance through zinc-flake coating that provides long-lasting protection in harsh industrial environments
- Precise thread engagement with Class 2A UNF fine threading ensuring secure fastening and vibration resistance
- Optimized torque transmission through the external hex drive design that prevents stripping during installation
- Enhanced durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
- Versatile partial threading allowing for both clamping and alignment functions in complex assemblies
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH 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 failure is not an option. The 7/16"-20 UNF fine threading provides superior resistance to vibration loosening, making them ideal for machinery, construction equipment, and automotive assemblies. The zinc-flake coated finish offers outstanding corrosion protection, significantly extending service life in challenging environments. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme loads, while the external hex drive ensures efficient installation with standard tools. The partially threaded design allows for precise clamping force distribution, solving common alignment issues in structural applications.
Specification Summary & Compliance
This Grade 8 hex head screw features precise Class 2A thread fit with 7/16"-20 UNF fine threading and 4" length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for safety and sustainability.
