S-90211A366 5/8"-11 x 2 1/2" SAE J429 Left-Hand Threaded High-Strength Steel Hex Head Screws
Left-Hand Threaded High-Strength 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 Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Precise thread engagement with Class 3A fit and UNC coarse thread profile ensuring reliable fastening performance
- Exceptional hardness rating at Rockwell C33 providing excellent resistance to wear and deformation
- Left-hand threading design offering specialized solutions for counter-rotational applications and safety-critical assemblies
- Full-threaded construction delivering consistent clamping force along the entire 2½" length
- Standard compliance assurance meeting SAE J429 specifications for quality and reliability in demanding applications
Professional Applications & Engineering Value
This Grade 8 hex head screw with left-hand UNC coarse threading provides engineered solutions for applications requiring counter-clockwise tightening security. The zinc yellow-chromate plated steel construction delivers exceptional corrosion resistance in industrial environments where exposure to moisture and chemicals is common. The external hex drive design allows for high-torque installation, making it ideal for heavy machinery, automotive assemblies, and structural applications where vibration resistance is critical. With Class 3A thread fit precision, these fasteners ensure reliable performance in high-stress applications, preventing loosening under dynamic loads while maintaining 150,000 psi tensile strength for maximum structural integrity.
Specification Summary & Compliance
This fastener features precision 5/8"-11 UNC coarse threads with Class 3A thread fit for superior engagement and meets SAE J429 specifications for Grade 8 fasteners. The manufacturing process ensures dimensional accuracy with Rockwell C33 hardness and 150,000 psi tensile strength verification. The zinc yellow-chromate plating provides corrosion protection while maintaining compliance with industrial standards for heavy-duty applications. Full 2½" length with complete threading ensures consistent performance across the entire fastener engagement area.
