S-91268A577 9/16"-12 x 3" 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
- Maximum load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through black-oxide finish, extending service life in demanding industrial environments
- Optimized thread engagement with UNC coarse threading providing faster assembly and reduced cross-threading risk
- Precise torque application enabled by external hex drive and substantial 13/16" head width for secure fastening
- Enhanced durability from Rockwell C33 hardness, maintaining structural integrity under repeated stress
- Reliable partial threading allowing unthreaded shank section to bear shear loads more effectively
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for consistent performance
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value in heavy machinery, structural steel connections, and industrial equipment assembly. The black-oxide steel construction provides superior corrosion protection where environmental factors threaten fastener integrity, while the 9/16"-12 UNC coarse thread design ensures rapid installation in thick materials and structural components. The partially threaded configuration concentrates thread engagement where needed most, preventing thread damage in shear zones. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners maintain clamp force under extreme vibration and dynamic loading conditions common in manufacturing, construction, and transportation equipment.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances for consistent engagement, these 3" length hex head screws comply with ASME B18.2.1 and SAE J429 standards. The inch system fasteners feature right-hand UNC threads with precise dimensional control. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across global industrial markets.
