S-92620A779 9/16"-18 x 1 1/4" 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
- Exceptional load-bearing capacity 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
- Precise thread engagement with Class 2A UNF fine threads ensuring secure fastening and vibration resistance
- Maximum drive torque capability through the external hex head design for easy installation and removal
- Enhanced durability from Rockwell C33 hardness steel construction resisting deformation under heavy loads
- Full thread coverage along the 1-1/4" length for consistent clamping force distribution
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed quality
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where failure is not an option. The 9/16"-18 UNF fine threading provides superior resistance to loosening under vibration, making them ideal for heavy machinery, construction equipment, and automotive assemblies. The zinc yellow-chromate plated steel construction offers exceptional protection against corrosion in outdoor or chemically aggressive environments. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme mechanical stress, preventing costly downtime and ensuring structural safety. The external hex drive design allows for high-torque installation, while the fully threaded configuration ensures maximum grip length for secure connections in critical industrial applications.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 9/16"-18 UNF fine threads and right-hand thread direction. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features a head height of 23/64" and head width of 13/16" for standard tool compatibility across industrial applications.
