S-91247A122 5/16"-24 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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
- Superior load-bearing capability with 120,000 PSI tensile strength for reliable performance in demanding applications
- Enhanced corrosion resistance through zinc plating, extending service life in various industrial environments
- Optimized thread engagement with 5/16"-24 UNF fine threads providing superior vibration resistance and precise fastening
- Grade 5 strength classification ensuring consistent mechanical properties and reliable performance under stress
- External hex drive design allowing for high torque application and secure installation with standard tools
- Precision thread fit with Class 2A tolerance ensuring smooth assembly and consistent performance
- Partial threading configuration offering both gripping power and clearance where needed for versatile applications
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers exceptional engineering value through its steel construction and zinc plating, specifically designed to address common industrial fastening challenges. The partially threaded 5/16"-24 UNF fine thread configuration provides superior resistance to vibration loosening while maintaining excellent tensile strength. The external hex drive enables high-torque installation without stripping, making it ideal for heavy machinery, structural assemblies, and equipment manufacturing where reliability is critical. With Rockwell C25 hardness, this fastener maintains integrity under repetitive stress cycles, solving durability concerns in automotive, construction, and industrial maintenance applications.
Specification Summary & Compliance
This 3" hex head screw features precise Class 2A thread fit tolerance with 5/16"-24 UNF fine threading and meets ASME B18.2.1 and SAE J429 manufacturing specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while maintaining the specified mechanical properties and dimensional accuracy.
