S-91268A921 7/8"-9 x 9" 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, ensuring extended service life under demanding conditions
- Optimized thread engagement through Class 2A thread fit and coarse UNC threading for faster assembly and reduced cross-threading risks
- Enhanced torque transmission with external hex drive and large 1 5/16" head width for secure installation with standard tools
- Partial threading design provides unthreaded shank section for improved shear strength in structural connections
- Full regulatory compliance with RoHS 3 and REACH environmental standards for safe use across global markets
- Industry-standard reliability meeting ASME B18.2.1 and SAE J429 specifications for consistent quality and interchangeability
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering value in heavy machinery, structural steel framing, and industrial equipment assembly where high tensile strength and reliable fastening are paramount. The 7/8"-9 UNC coarse thread configuration ensures rapid installation in thick materials while maintaining vibration resistance, significantly reducing assembly time in large-scale projects. The partially threaded design concentrates thread engagement where needed most, preventing stress concentration in the threaded portion and enhancing overall joint integrity. Manufactured from high-strength steel with external hex drive, these fasteners withstand extreme torque applications common in construction, mining, and transportation equipment where failure is not an option.
Specification Summary & Compliance
This 9-inch hex head screw features precise Class 2A thread fit per UNC standards with minimum thread length of 2 1/4". Manufacturing complies with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental standards for industrial use worldwide.
