S-91247A130 5/16"-24 x 4 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
- Exceptional tensile strength of 120,000 psi for reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance with zinc plating, extending service life in harsh environments and minimizing maintenance needs.
- Fine UNF threading (5/16"-24) ensures tighter, more secure fastening with enhanced vibration resistance compared to coarse threads.
- Class 2A thread fit provides consistent, easy assembly while maintaining precise tolerances for smooth installation and removal.
- External hex drive design allows for high-torque application with standard tools, speeding up installation and reducing labor time.
- Partially threaded shank offers optimal grip and clamping force where needed, ideal for materials requiring controlled tension.
- Rockwell C25 hardness delivers excellent durability and wear resistance, ensuring long-term reliability under repetitive loads.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty assembly, such as structural integrity and vibration-induced loosening. The UNF fine thread design provides superior holding power in metal-to-metal and high-stress applications, reducing the need for frequent retightening. Made from zinc plated steel, it resists corrosion in industrial settings, while the external hex drive ensures compatibility with common tools for efficient installation. Ideal for machinery, automotive, and construction uses, this screw combines high tensile strength and precise Class 2A thread fit to prevent stripping and ensure consistent performance in demanding environments.
Specification Summary & Compliance
This screw adheres to ASME B18.2.1 and SAE J429 standards, with a Class 2A thread fit for consistent dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality. The 5/16"-24 UNF fine thread and 4 1/2" length meet precise engineering requirements for reliable fastening in industrial applications.
