S-91257A661 3/8"-24 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
- Maximum load-bearing capability with 150,000 psi tensile strength and Rockwell C33 hardness for reliable performance in demanding applications
- Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh industrial environments
- Precise thread engagement with Class 2A thread fit and UNF fine threading ensuring secure fastening and vibration resistance
- Optimized torque transmission via external hex drive design that prevents tool slippage during installation
- Versatile partial threading allowing both clamping and alignment functions in structural assemblies
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality and interoperability
- Environmental regulation adherence with RoHS 3 and REACH compliance for safe industrial usage
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws solve critical fastening challenges where high tensile strength and corrosion resistance are paramount. The 3/8"-24 UNF fine thread configuration provides superior resistance to vibrational loosening in machinery, automotive, and construction equipment. The zinc yellow-chromate plating creates a protective barrier against oxidation and chemical exposure, while the partially threaded design allows for both precise clamping and structural alignment. These external hex drive fasteners deliver exceptional torque transmission efficiency, reducing installation time and preventing damage to drive interfaces in high-stress assemblies requiring ASME B18.2.1 compliance.
Specification Summary & Compliance
This 2-1/2" length hex head screw features precise Class 2A thread fit per UNF standards with minimum thread length of 1". Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substance control.
