S-91247A127 5/16"-24 x 3 3/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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
- Superior load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
- Enhanced corrosion resistance through zinc plating, extending service life in various industrial environments
- Precise thread engagement with Class 2A UNF fine threading ensuring secure fastening and vibration resistance
- Optimized strength-to-weight ratio from Grade 5 steel construction with Rockwell C25 hardness
- Easy installation and removal with standard external hex drive and familiar 1/2" head width
- Versatile partial threading design allowing both clamping and alignment functions in assembly
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for global applications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 5 steel hex head screws deliver exceptional reliability in machinery assembly, structural frameworks, and equipment manufacturing. The 5/16"-24 UNF fine threading provides superior resistance to vibration loosening while maintaining precise clamping force. The zinc plated finish offers crucial corrosion protection in challenging environments, from manufacturing facilities to outdoor installations. With partial threading design, these fasteners efficiently combine the benefits of threaded engagement with unthreaded shank strength, making them ideal for applications requiring both precise alignment and high clamping force. The external hex drive ensures compatibility with standard tools while the Rockwell C25 hardness maintains thread integrity through repeated installations.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit with 5/16"-24 UNF fine threading and 3 3/4" length with 7/8" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use across global markets.
