S-91268A826 5/8"-11 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
- Maximum load-bearing capability with 150,000 PSI tensile strength for superior performance in heavy-duty applications
- Enhanced durability and wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
- Secure and reliable fastening with Class 2A thread fit ensuring precise engagement and vibration resistance
- Easy installation and removal using standard external hex drive tools, reducing assembly time and labor costs
- Optimized for high-stress applications through Grade 8 steel construction and coarse UNC threads for superior grip
- Partial threading design provides unthreaded shank strength where maximum clamping force is required
- Full regulatory compliance with RoHS 3 and REACH standards, ensuring environmental responsibility and global acceptance
Professional Applications & Engineering Value
Engineered for industrial strength requirements, this Grade 8 hex head screw delivers exceptional performance in construction, heavy machinery, and structural applications where failure is not an option. The 5/8"-11 UNC coarse thread configuration provides superior resistance to vibration loosening while enabling quick assembly in thick materials. Manufactured from high-grade steel with Rockwell C33 hardness, this fastener maintains integrity under extreme tension and shear forces. The partially threaded design concentrates strength in the shank section, preventing thread stripping in high-clamp applications. Meeting ASME B18.2.1 and SAE J429 specifications, these hex head screws provide engineers with reliable, standardized components for critical connections in infrastructure, equipment manufacturing, and industrial maintenance.
Specification Summary & Compliance
This 5/8"-11 UNC hex head screw features Class 2A thread fit tolerances for precise engagement and complies with ASME B18.2.1 and SAE J429 Grade 8 standards. The fastener is manufactured to inch system specifications with external hex drive configuration and right-hand thread direction. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring environmental safety and global market acceptance for industrial applications.
