S-91670A622 3/8"-16 x 3/4" 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
- Superior corrosion resistance with Black-Oxide coating, extending service life in harsh industrial environments
- Exceptional mechanical strength with 170,000 psi tensile strength and Rockwell C37 hardness for heavy-duty applications
- Precision thread engagement through Class 3A fit and fully threaded design ensures reliable fastening performance
- Left-hand thread security provides anti-loosening protection in rotating machinery applications
- Standard hex drive compatibility with 5/16" drive size for easy installation using common tools
- Comprehensive compliance with ASTM A574 manufacturing standards and environmental regulations including RoHS 3 and REACH
- Coarse thread advantage with UNC 3/8"-16 specification enables quick assembly and disassembly in demanding conditions
Professional Applications & Engineering Value
This left-hand thread socket head cap screw delivers critical engineering solutions where reverse-rotation security is paramount. The Black-Oxide Alloy Steel construction provides superior corrosion protection while maintaining the 170,000 psi tensile strength required for high-stress applications. The Class 3A thread fit ensures precise engagement in machinery, automotive, and aerospace components where vibration resistance is essential. The coarse UNC thread profile facilitates rapid assembly in production environments, while the fully threaded design maximizes grip length for secure fastening in critical joints. These socket head cap screws are engineered to prevent accidental loosening in rotating equipment, making them ideal for motors, pumps, and conveyor systems where standard right-hand threads would naturally unscrew.
Specification Summary & Compliance
This fastener maintains Class 3A thread fit tolerance according to UNC 3/8"-16 specifications with coarse thread spacing for optimal performance. Manufacturing complies with ASTM A574 standards for socket head cap screws, ensuring consistent quality and dimensional accuracy. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the product meets current environmental safety requirements for industrial use worldwide.
