S-92620A579 5/16"-18 x 5/8" 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 capability with 150,000 PSI tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Optimized thread engagement through UNC coarse threading and Class 2A fit for secure fastening and vibration resistance
- Maximum hardness durability with Rockwell C33 rating to maintain structural integrity under repeated use
- Enhanced installation efficiency through external hex drive design for straightforward torque application
- Full threading coverage along the 5/8" length ensures consistent clamping force distribution
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The zinc yellow-chromate plated steel construction provides exceptional corrosion protection in manufacturing, construction, and machinery assembly environments. The 5/16"-18 UNC coarse threading ensures rapid installation and superior resistance to vibration loosening, while the external hex drive accommodates high torque requirements without stripping. With 150,000 PSI tensile strength and Rockwell C33 hardness, these fully threaded screws maintain clamping force under extreme conditions, making them ideal for structural connections, equipment frames, and high-vibration machinery where reliability is paramount.
Specification Summary & Compliance
This 5/16"-18 UNC hex head screw features Class 2A thread fit for precise dimensional accuracy and optimal assembly clearance. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. The right-hand thread direction and coarse thread spacing provide industry-standard compatibility across various applications.
