S-91268A909 7/8"-9 x 6" 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 environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
- Enhanced torque transmission through external hex drive design, preventing tool slippage during installation
- Controlled thread distribution with partial threading to concentrate strength where needed most
- Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards
- Robust material integrity from Grade 8 steel construction, ensuring consistent performance under extreme conditions
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery assembly, and structural frameworks. The 7/8"-9 UNC coarse thread configuration provides superior resistance to vibrational loosening while enabling rapid installation in thick materials. With partial threading concentrating strength along the shank, the fastener maintains structural integrity where stress concentrations typically occur. The external hex drive design ensures maximum torque transfer during installation, preventing rounding and damage to the drive surface. Manufactured from high-strength steel and heat-treated to Rockwell C33 hardness, these screws deliver reliable performance in extreme temperature and load conditions, making them ideal for critical connections in industrial equipment, structural steelwork, and heavy machinery where failure is not an option.
Specification Summary & Compliance
This 6" length hex head screw features precise Class 2A thread fit tolerances with 7/8"-9 UNC coarse threading and minimum 2" thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, guaranteeing safe use across various industrial sectors.
