S-92620A581 5/16"-18 x 3/4" 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
- Maximum load-bearing capability with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Exceptional hardness rating of Rockwell C33 ensures minimal wear and deformation under heavy loads
- Reliable thread engagement with Class 2A UNC coarse threads for quick assembly and vibration resistance
- Full-length threading provides consistent grip strength across the entire fastener length
- Standard-compliant manufacturing meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
- External hex drive design enables high-torque installation with common tools
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where failure is not an option. The steel construction combined with 150,000 psi tensile strength addresses the fundamental need for reliable fastening in structural applications, heavy machinery, and construction projects. The zinc yellow-chromate plating provides essential corrosion protection in industrial environments where moisture and chemicals are present. With UNC coarse threads and Class 2A fit, these fasteners ensure rapid assembly while maintaining vibration resistance in dynamic load conditions. The external hex drive accommodates high installation torque requirements, making them ideal for maintenance operations and production lines where speed and reliability are paramount.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18). Fully compliant with ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance. The fully threaded design ensures consistent performance across the entire 3/4" length.
