S-90211A258 5/16"-18 x 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
- Exceptional tensile strength with 150,000 PSI rating ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance through zinc yellow-chromate plating protects against harsh environmental conditions
- Precise Class 3A thread fit guarantees secure fastening and vibration resistance in critical assemblies
- Left-hand threading design provides specialized functionality for counter-rotational systems and safety applications
- Heavy-duty Grade 8 construction with Rockwell C33 hardness delivers maximum durability and load-bearing capacity
- Full threading coverage along the 2-inch length ensures consistent engagement and holding power
- External hex drive compatibility allows for standard tooling and efficient installation in confined spaces
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these Grade 8 hex head screws with left-hand UNC coarse threading provide critical solutions where standard right-hand fasteners would loosen under counter-clockwise rotation. The zinc yellow-chromate plated steel construction combats corrosion in manufacturing facilities, heavy machinery, and outdoor equipment. With 150,000 PSI tensile strength and Class 3A thread fit, these fasteners maintain integrity in high-vibration applications such as automotive systems, industrial motors, and construction equipment where failure is not an option. The external hex drive design ensures compatibility with standard tools while providing sufficient torque transmission for secure installations.
Specification Summary & Compliance
This 5/16"-18 x 2" left hand hex head screw features UNC coarse thread spacing with precision Class 3A thread fit tolerances. Manufactured from high-strength steel with Rockwell C33 hardness and fully threaded design. Complies with SAE J429 specifications for Grade 8 fasteners and features corrosion-resistant zinc yellow-chromate plating for extended service life in industrial applications.
