S-90211A344 1/2"-13 x 3 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
- Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, minimizing loosening over time.
- Left-hand threading offers specialized solutions for assemblies requiring reverse rotation to prevent unintended disassembly.
- Fully threaded design allows for maximum grip length and uniform load distribution across the entire fastener.
- Heavy-duty Grade 8 rating with Rockwell C33 hardness guarantees durability under extreme mechanical loads.
- External hex drive enables easy installation and removal with standard tools, improving maintenance efficiency.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these Grade 8 hex head screws combine high-strength steel and left-hand UNC coarse threads to address critical fastening challenges. The zinc yellow-chromate plating provides robust protection against corrosion, making them ideal for machinery, automotive, and construction applications exposed to moisture or chemicals. Their fully threaded configuration ensures secure clamping in thick materials, while the Class 3A thread fit maintains precision in high-vibration environments. By meeting SAE J429 specifications, these screws deliver consistent performance, reducing downtime and maintenance costs in heavy-duty assemblies.
Specification Summary & Compliance
This product adheres to UNC coarse thread standards with a Class 3A thread fit for precise dimensional accuracy. Manufacturing complies with SAE J429 specifications, ensuring material integrity and performance. The zinc yellow-chromate finish meets industry requirements for corrosion protection, and the fastener is suitable for applications requiring left-hand threading and Grade 8 strength. Components are produced in accordance with relevant industrial standards for quality and reliability.
