S-91257A606 5/16"-18 x 7 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 load-bearing capacity with 150,000 PSI tensile strength for demanding structural applications
- Superior corrosion resistance provided by zinc yellow-chromate plating in harsh industrial environments
- Optimized torque transmission through external hex drive design for secure installation
- Reliable thread engagement with Class 2A thread fit ensuring consistent assembly performance
- Enhanced durability from Rockwell C33 hardness rating for long service life
- Versatile partial threading allowing for both clamping and alignment functions
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in construction machinery, automotive assemblies, and structural frameworks. The 5/16"-18 UNC coarse thread configuration provides superior resistance to vibration loosening while enabling quick installation in thick materials. The zinc yellow-chromate plating creates a protective barrier against corrosion, significantly extending service life in outdoor or high-moisture environments. With partial threading design, these fasteners offer precise clamping force control while maintaining unthreaded shank strength. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness ensures reliable performance under extreme mechanical stress, making them ideal for critical connections where failure is not an option.
Specification Summary & Compliance
This 7 1/2" length hex head screw features precise Class 2A thread fit tolerances and UNC coarse threading with 5/16"-18 thread size. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener maintains compliance with industrial standards for high-strength applications, with zinc yellow-chromate finish meeting corrosion protection requirements for demanding operational environments.
