S-90211A342 1/2"-13 x 3" 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
- Exceptional load-bearing capability with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
- Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Enhanced durability from Grade 8 steel construction with Rockwell C33 hardness for long-term reliability
- Easy installation and removal with external hex drive design and left-hand threading for specialized applications
- Optimal thread performance through UNC coarse threading that resists loosening under dynamic loads
- Industry compliance assurance meeting SAE J429 specifications for quality and performance standards
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions for demanding industrial environments where reverse-rotation applications require specialized left-hand threading. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures reliable performance in heavy machinery, automotive assemblies, and construction equipment where vibration and high torque are constant challenges. The zinc yellow-chromate plating provides essential corrosion protection for extended service life in outdoor or chemically aggressive settings. With UNC coarse threads and Class 3A fit, these fasteners maintain secure connections while resisting loosening under dynamic loads, making them ideal for counter-rotating equipment, conveyor systems, and specialized mechanical assemblies where standard right-hand threads would unscrew during operation.
Specification Summary & Compliance
This 1/2"-13 UNC hex head screw features precise Class 3A thread fit tolerances with left-hand coarse threading and full threading along the 3" length. Manufactured from high-strength Grade 8 steel with zinc yellow-chromate finish for corrosion resistance. Fully compliant with SAE J429 specifications for dimensional accuracy and mechanical properties, ensuring reliable performance in industrial applications requiring exacting standards for strength and durability.
