S-91268A220 5/16"-18 x 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior hardness and durability with Rockwell C33 rating to resist wear and deformation under heavy use
- Optimized thread engagement through UNC coarse threading and Class 2A fit for secure fastening in various materials
- Full-length threading provides maximum grip and adjustment flexibility across the entire 2" length
- Heavy-duty Grade 8 steel construction ensures consistent performance in demanding industrial environments
- Standard-compliant design meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
- External hex drive compatibility with 1/2" head width for easy installation using common tools
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The 150,000 psi tensile strength and Rockwell C33 hardness provide critical resistance to vibration loosening and structural fatigue in machinery, construction, and automotive assemblies. The UNC coarse thread pattern with Class 2A fit ensures rapid installation and reliable holding power in both soft and hard materials, while the fully threaded design maximizes surface contact for superior load distribution. These 5/16"-18 hex head screws are specifically designed to withstand extreme mechanical stresses in structural connections, equipment manufacturing, and heavy machinery maintenance applications.
Specification Summary & Compliance
This 2" length hex head screw features precise Class 2A thread fit with UNC coarse threading (5/16"-18) and right-hand thread direction. 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, making it suitable for global industrial applications requiring strict regulatory adherence.
