S-90211A261 5/16"-18 x 2 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.
- Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear in demanding industrial environments.
- Zinc yellow-chromate plated finish offers excellent corrosion resistance, extending the screw's service life in harsh conditions.
- Left-hand UNC coarse thread with Class 3A fit ensures precise, secure fastening in specialized assemblies where reverse threading is required.
- Fully threaded design allows for maximum grip and load distribution along the entire length, enhancing joint stability.
- External hex drive and hex head facilitate easy installation and removal with standard tools, improving assembly efficiency.
- Compliance with SAE J429 specifications guarantees consistent quality and interoperability in regulated industrial applications.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty and high-vibration environments, such as machinery, automotive, and construction assemblies. The left-hand UNC coarse thread is ideal for applications where standard right-hand threads may loosen under rotational forces, providing a secure fastening solution. Made from high-strength steel and finished with zinc yellow-chromate plating, it resists corrosion and wear, ensuring long-term reliability. The fully threaded design and Class 3A thread fit offer precise engagement, reducing the risk of stripping and improving load-bearing capacity. By meeting SAE J429 standards, this screw delivers consistent performance for industrial professionals seeking durability and compliance in inch fasteners.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse thread specifications. It complies with SAE J429 for material and mechanical properties, ensuring reliability in industrial use. The product meets common regulatory requirements for quality and safety in fastener applications.
