S-91670A589 5/16"-18 x 2" ASTM A574 Left-Hand Threaded Alloy Steel Socket Head Screws
Left-Hand Threaded Alloy Steel Socket 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 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Left-hand thread design provides secure fastening in counter-rotating systems, preventing loosening under reverse torque conditions.
- Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in harsh industrial environments.
- Class 3A thread fit offers precise, tight tolerances for superior engagement and vibration resistance in critical assemblies.
- 1/4" hex drive socket head allows for easy installation and removal with standard tools, improving maintenance efficiency.
- Full compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chain integration.
- Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity over repeated use cycles.
Professional Applications & Engineering Value
This 5/16"-18 left hand UNC socket head cap screw is engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in demanding settings. The black-oxide alloy steel construction, combined with a coarse thread profile, ensures robust performance in machinery, automotive, and aerospace applications where reverse-thread mechanisms are critical. Its high tensile strength and Class 3A thread fit provide secure fastening under dynamic loads, reducing maintenance downtime. Ideal for use in assembly lines and heavy equipment, this screw delivers reliable corrosion resistance and long-term durability, meeting strict engineering standards for industrial fasteners.
Specification Summary & Compliance
This product adheres to Class 3A thread fit tolerances and UNC coarse thread standards, ensuring precise dimensional accuracy. It meets ASTM A574 specifications for high-strength socket head cap screws and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity.
