S-91286A447 5/8"-18 x 3 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 high-stress applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Optimized drive efficiency featuring external hex design for high-torque installation with standard tools
- Enhanced material integrity with Rockwell C33 hardness providing excellent wear resistance and durability
- Versatile partial threading allowing combined clamping and unthreaded shank benefits in structural applications
- Full regulatory compliance meeting ASME, SAE, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The zinc-flake coated steel construction provides exceptional corrosion resistance, solving common failure points in manufacturing equipment, construction machinery, and transportation systems. The 5/8"-18 UNF fine thread configuration ensures superior vibration resistance in dynamic load environments, while the external hex drive enables high-torque installation without stripping. The partially threaded design offers optimal stress distribution, making these industrial hex screws ideal for applications requiring both precise clamping force and unthreaded shear strength.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances with UNF fine threading (18 TPI) on a 0.625" diameter. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 3 1/2" length with 1 1/2" minimum thread length and 15/16" head width for standardized installation.
