S-91286A180 5/16"-24 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
- Exceptional load-bearing capacity with 150,000 PSI tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with UNF fine spacing and Class 2A fit ensuring vibration resistance and secure fastening
- Maximum material strength through Grade 8 steel construction and Rockwell C33 hardness for durability
- Full threading design offering consistent clamping force along the entire 3/4" length
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interoperability
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable procurement
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions where failure is not an option. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness provides exceptional resistance to shear and tensile forces in heavy machinery, structural steel connections, and automotive assemblies. The zinc-flake coating offers superior protection against corrosion in outdoor or chemically aggressive environments, significantly reducing maintenance frequency and replacement costs. With UNF fine threading and Class 2A fit, these screws maintain secure fastening under vibration and dynamic loading conditions common in industrial equipment. The external hex drive design allows for high-torque installation using standard tools, making them ideal for applications requiring both accessibility and maximum clamping force.
Specification Summary & Compliance
This 5/16"-24 UNF hex head screw features precise Class 2A thread fit with fine spacing and full threading along its 3/4" length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry standards for hazardous substance restrictions.
