S-91268A919 7/8"-9 x 8" 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 demanding structural applications
- Superior durability through Grade 8 steel construction and Rockwell C33 hardness
- Reliable coarse threading with UNC 7/8"-9 pattern for faster installation in tough materials
- Precise Class 2A thread fit ensuring consistent engagement and vibration resistance
- Optimized partial threading providing maximum grip length where needed
- Heavy-duty external hex drive enabling high-torque installation with standard tools
- Full regulatory compliance meeting ASME B18.2.1 standards and environmental regulations
Professional Applications & Engineering Value
This Grade 8 heavy-duty hex head screw delivers critical performance in demanding industrial environments where failure is not an option. The 150,000 psi tensile strength and Rockwell C33 hardness provide exceptional resistance to shear forces and material deformation, making it ideal for structural steel connections, heavy machinery assembly, and infrastructure projects. The 7/8"-9 UNC coarse threading ensures rapid installation in thick materials while maintaining superior pull-out resistance. With partial threading optimizing the grip length, this fastener provides concentrated holding power exactly where needed. The external hex drive accommodates high-torque applications, preventing tool slippage during critical installations. Engineered to ASME B18.2.1 standards, this screw offers predictable performance and interchangeability across industrial applications.
Specification Summary & Compliance
This 8-inch hex head screw features precise Class 2A thread fit with 7/8"-9 UNC coarse threading and 2 1/4" minimum thread length. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, it ensures dimensional accuracy and mechanical consistency. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting the latest environmental regulations for industrial components.
