S-91268A250 5/16"-18 x 2 1/2" 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 capacity with 150,000 psi tensile strength for critical structural applications
- Superior wear resistance from Rockwell C33 hardness, extending service life in demanding environments
- Reliable thread engagement through Class 2A thread fit and coarse UNC threading for faster assembly
- Full-threaded design ensures consistent clamping force along the entire 2-1/2" length
- Heavy-duty steel construction meets Grade 8 specifications for the most challenging industrial applications
- External hex drive compatibility with standard tools for quick installation and removal
- Environmental compliance with RoHS 3 and REACH standards for sustainable operations
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in heavy-duty applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides critical resistance to shear forces and vibration-induced loosening in construction, machinery assembly, and structural steel applications. The 5/16"-18 UNC coarse thread design ensures rapid installation while maintaining Class 2A thread fit precision for consistent torque values. Fully threaded along the entire 2-1/2" length, these steel fasteners distribute clamping force evenly, preventing joint failure in high-stress environments. The external hex drive accommodates standard industrial tools, streamlining maintenance and assembly processes while the ASME B18.2.1 compliance guarantees dimensional accuracy and interchangeability.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit tolerance and UNC coarse thread specifications. Complies with ASME B18.2.1 dimensional requirements and SAE J429 Grade 8 mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards. Features 5/16"-18 thread size with 2-1/2" length and fully threaded configuration for consistent performance across industrial applications.
