S-91309A599 5/16"-18 x 4" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength 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 corrosion resistance with zinc plating, extending service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and stress
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Class 2A thread fit offers consistent, easy assembly while maintaining secure fastening
- Fully threaded design allows for maximum grip and adjustability across the entire 4" length
- External hex drive enables quick installation and high torque application with standard tools
- Coarse UNC threading facilitates faster assembly and better performance in materials prone to stripping
Professional Applications & Engineering Value
These 5/16"-18 UNC hex head screws deliver exceptional engineering value for heavy-duty industrial applications where reliability is paramount. The combination of high-strength steel construction and zinc plating addresses common challenges of structural fatigue and environmental corrosion in machinery, construction, and manufacturing equipment. The fully threaded design with coarse UNC threading ensures maximum engagement in various materials, reducing the risk of stripping while providing superior clamping force. With external hex drive compatibility, these screws enable efficient installation and maintenance operations, making them ideal for applications requiring frequent disassembly and reassembly while maintaining 60,000 psi tensile strength integrity throughout the fastener's service life.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread specifications. These hex head screws comply with ASME B18.2.1 and ASTM A307 manufacturing standards, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety, making them suitable for global industrial applications requiring environmental compliance.
