S-90211A250 5/16"-18 x 3/4" 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 150,000 psi tensile strength and Grade 8 classification for demanding industrial applications
- Superior corrosion resistance through zinc yellow-chromate plating that protects against harsh environmental conditions
- Precision thread engagement with Class 3A fit and UNC coarse thread design ensuring reliable fastening performance
- Enhanced durability from Rockwell C33 hardness that maintains structural integrity under repeated stress
- Left-hand threading advantage for specialized applications where reverse-direction fastening is required
- Optimized drive efficiency with external hex head design providing maximum torque transfer during installation
- Industry-standard compliance meeting SAE J429 specifications for guaranteed quality and interchangeability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where standard fasteners fail. The zinc yellow-chromate plated steel construction provides superior corrosion protection in challenging environments, while the left-hand UNC coarse thread with Class 3A fit ensures precise engagement in high-vibration machinery and reverse-thread applications. The external hex drive design allows for high-torque installation, making these industrial screws ideal for construction equipment, automotive assemblies, and manufacturing machinery where 150,000 psi tensile strength and Rockwell C33 hardness are critical for long-term reliability and safety.
Specification Summary & Compliance
This 5/16"-18 hex head screw features precision UNC coarse threads with Class 3A thread fit for optimal engagement. Manufactured to meet SAE J429 specifications for Grade 8 fasteners, ensuring consistent quality and performance. The 3/4" length and fully threaded design provide complete fastening coverage. Compliant with industry standards for dimensional accuracy and material properties, making these screws suitable for regulated industrial applications requiring certified components.
