S-91247A591 5/16"-18 x 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 strength for demanding applications with Grade 5 classification and 120,000 psi tensile strength, ensuring reliable performance under high stress.
- Enhanced corrosion resistance from the zinc plating, extending service life in various industrial environments.
- Optimized for easy installation and removal featuring an external hex drive and coarse UNC thread for quick assembly with standard tools.
- Excellent thread engagement and durability with Class 2A thread fit and Rockwell C25 hardness, reducing the risk of stripping and wear.
- Versatile partial threading design allowing for precise clamping force control in a wide range of materials and joint types.
- Compliance with major industry standards including ASME B18.2.1 and SAE J429, guaranteeing consistent quality and interchangeability.
- RoHS 3 and REACH compliant ensuring environmental safety and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy-duty assemblies, such as machinery, construction, and automotive frameworks. Its 5/16"-18 UNC coarse thread and partially threaded design provide superior grip and vibration resistance, minimizing loosening in dynamic loads. The zinc plating offers a protective barrier against moisture and chemicals, crucial for outdoor or corrosive settings. With a high tensile strength of 120,000 psi and Rockwell C25 hardness, it withstands extreme forces without deformation, reducing maintenance needs and downtime. Ideal for industrial fastening where reliability and compliance with ASME B18.2.1 standards are paramount, this screw ensures long-term structural integrity and safety.
Specification Summary & Compliance
This fastener adheres to precise dimensional tolerances, including a Class 2A thread fit for consistent engagement and UNC coarse thread specifications. It meets ASME B18.2.1 and SAE J429 manufacturing standards, ensuring uniformity and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in global markets.
