S-91257A635 3/8"-16 x 2 3/4" 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 capability with Grade 8 strength and 150,000 PSI tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit ensuring secure fastening and vibration resistance
- Enhanced torque application through external hex drive design and 9/16" head width for easy installation with standard tools
- Versatile partial threading allowing for both clamping and alignment functions in various assembly configurations
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability and quality
- Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The 3/8"-16 UNC coarse thread configuration provides excellent engagement in both metallic and composite materials, while the partial threading design allows for precise clamping force distribution. The zinc yellow-chromate plating creates a protective barrier against moisture and chemical exposure, significantly extending service life in outdoor, marine, and industrial applications. These steel fasteners are engineered to withstand extreme vibration and dynamic loads common in heavy machinery, construction equipment, and automotive assemblies, making them ideal for critical structural connections where failure is not an option.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit tolerances with 3/8"-16 UNC coarse threading and 2 3/4" length. Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances above threshold limits.
