S-91268A907 7/8"-9 x 5 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding industrial environments
- Secure fastening with coarse UNC threading providing excellent grip and vibration resistance in various materials
- Optimized torque transmission through external hex drive design for efficient installation and removal
- Precision thread fit (Class 2A) ensuring consistent engagement and reduced risk of cross-threading
- Partial threading design offering both gripping strength and unthreaded shank stability
- Comprehensive regulatory compliance meeting ASME, SAE, RoHS 3 and REACH standards for global industrial use
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance where structural integrity is paramount. The 7/8"-9 UNC coarse thread configuration provides superior pull-out resistance in steel frameworks, construction equipment, and heavy machinery assemblies. The partially threaded design combines the clamping force of threaded engagement with the shear strength of an unthreaded shank, making them ideal for pivot points and structural connections. With 150,000 psi tensile strength and Rockwell C33 hardness, these industrial fasteners withstand extreme dynamic loads and repetitive stress in manufacturing, infrastructure, and transportation applications. The external hex drive ensures reliable torque application even in confined spaces, while the steel construction maintains performance across temperature variations and harsh operating conditions.
Specification Summary & Compliance
Manufactured to precise inch system measurements with Class 2A thread fit tolerance for consistent performance. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features right-hand UNC coarse threading with minimum 2" thread length on a 5 1/2" overall length, providing optimal engagement for heavy-duty fastening applications.
