S-91286A405 5/8"-11 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 and Grade 8 classification for demanding industrial applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh environments
- Optimized torque transmission with external hex drive and 15/16" head width for secure installation
- Reliable thread engagement featuring UNC coarse threads and Class 2A fit for vibration resistance
- Controlled thread distribution with partial threading design for precise fastening in specific applications
- Enhanced durability backed by Rockwell C33 hardness for repeated use without deformation
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for engineering consistency
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where structural integrity matters most. The zinc-flake coated steel construction provides exceptional corrosion resistance in manufacturing plants, construction sites, and machinery assembly - environments where moisture and chemicals would compromise ordinary fasteners. The 5/8"-11 UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening, while the partial threading design allows for precise clamping force distribution. With external hex drive compatibility, these screws integrate seamlessly with standard industrial tools, reducing installation time and improving workplace efficiency across automotive, structural steel, and heavy equipment maintenance applications.
Specification Summary & Compliance
This 2 1/2" length hex head screw features precise Class 2A thread fit tolerances and UNC coarse threading per ASME standards. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for industrial use.
