S-91247A451 5/8"-18 x 6 1/2" 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 tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Zinc plating provides excellent corrosion resistance, extending the service life of the screw in various industrial environments.
- Fine UNF threads and Class 2A thread fit offer precise engagement and vibration resistance, maintaining secure connections.
- Grade 5 steel construction with Rockwell C25 hardness delivers durability and wear resistance for long-term use.
- Partially threaded design allows for effective clamping in assemblies where unthreaded shank strength is critical.
- External hex drive and hex head enable easy installation and removal with standard tools, improving efficiency.
- Compliance with ASME B18.2.1 and SAE J429 standards ensures consistent quality and interoperability in mechanical systems.
Professional Applications & Engineering Value
This 5/8"-18 UNF Grade 5 hex head screw is engineered to address common industrial challenges, such as joint integrity under dynamic loads. Made from high-strength steel and finished with zinc plating, it resists corrosion in harsh conditions, reducing maintenance needs. The fine thread and Class 2A fit provide superior grip and vibration resistance, ideal for machinery, automotive, and construction applications where precision and reliability are paramount. Its partially threaded design ensures optimal load distribution, preventing loosening in critical assemblies and enhancing overall safety and performance.
Specification Summary & Compliance
This screw features a thread fit of Class 2A for precise tolerances, adhering to UNF thread specifications with a size of 5/8"-18. It meets manufacturing standards including ASME B18.2.1 and SAE J429, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality assurance for industrial use.
