S-91286A264 3/8"-24 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 capability with Grade 8 classification and 150,000 psi tensile strength for reliable performance in demanding applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with UNF fine threads and Class 2A fit ensuring secure fastening and vibration resistance
- Optimized torque transmission via external hex drive design for easy installation with standard tools
- Controlled thread engagement through partial threading for precise clamping force distribution
- Enhanced durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
- Regulatory compliance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental requirements
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where high tensile strength and corrosion resistance are paramount. The zinc-flake coated steel construction provides exceptional protection against environmental degradation, while the 3/8"-24 UNF fine threads offer superior vibration resistance in dynamic applications. The partially threaded design ensures optimal stress distribution, making these heavy-duty hex screws ideal for machinery assembly, structural frameworks, and automotive components where precision fastening and long-term reliability are essential. The combination of Rockwell C33 hardness and controlled thread geometry addresses common failure points in industrial settings.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNF fine thread specifications. Complies with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features 3 1/2" length with 1" minimum thread length and external hex drive configuration for standardized installation.
