S-91247A231 3/8"-24 x 3" 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, ideal for high-stress industrial assemblies.
- Enhanced corrosion resistance through zinc plating, extending service life in demanding environments.
- Precise thread engagement with Class 2A fit and UNF fine threading, ensuring reliable, vibration-resistant connections.
- High-strength Grade 5 steel construction with Rockwell C25 hardness, offering excellent durability and wear resistance.
- Efficient installation and removal using a standard external hex drive and 9/16" head width for easy tool access.
- Optimized for partial threading over a 1" minimum length, providing unthreaded shank strength where needed.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality and performance.
Professional Applications & Engineering Value
This 3/8"-24 UNF hex head screw is engineered to address critical challenges in industrial fastening, where vibration loosening and material fatigue are common concerns. The fine thread spacing and Class 2A thread fit deliver superior clamping force retention, reducing maintenance needs in machinery, automotive, and structural applications. Made from Grade 5 steel and finished with a protective zinc plating, it resists environmental corrosion while maintaining high tensile strength under dynamic loads. The external hex drive and partially threaded design allow for quick assembly and disassembly, making it a reliable choice for heavy-duty equipment and repetitive service conditions.
Specification Summary & Compliance
This fastener adheres to Class 2A thread tolerance per UNF standards, with a 3/8"-24 thread size and 3" length. It meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are upheld.
