S-90211A252 5/16"-18 x 1" 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 capacity with 150,000 PSI tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating for extended service life in harsh environments
- Precise thread engagement with Class 3A fit and UNC coarse threads ensuring reliable fastening performance
- Exceptional durability backed by Rockwell C33 hardness and Grade 8 certification for heavy-duty use
- Optimal torque transmission via external hex drive design for secure installation and removal
- Reverse-threading safety with left-hand direction preventing unintended loosening in rotating machinery
- Full-thread coverage providing consistent clamping force along the entire 1" length
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding industrial environments where vibration resistance and reverse-threading requirements are critical. The left-hand UNC thread configuration provides secure fastening in rotating equipment applications where standard right-hand threads might loosen under counter-clockwise motion. Manufactured from high-grade steel with zinc yellow-chromate plating, this fastener maintains integrity in corrosive conditions while the external hex drive enables high-torque installation. The coarse thread design ensures rapid assembly and superior holding power in various materials, making it ideal for heavy machinery, automotive systems, and structural applications requiring 150,000 PSI tensile strength and compliance with SAE J429 specifications.
Specification Summary & Compliance
This 5/16"-18 UNC left-hand threaded fastener features Class 3A thread fit for precision tolerance, fully threaded 1" length, and meets SAE J429 Grade 8 mechanical properties. The product maintains dimensional accuracy per inch-series standards and features zinc yellow-chromate plating for corrosion protection. Manufacturing complies with industry specifications for high-strength fasteners including material composition, heat treatment, and mechanical performance requirements.
