S-90306A222 1/4"-20 x 3/4" Left-Hand Threaded 18-8 Stainless Steel Hex Head Screws
Left-Hand Threaded 18-8 Stainless 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 corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and prolonged outdoor use
- Superior mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Secure left-hand threading prevents loosening in counter-rotating applications, providing enhanced safety in machinery and equipment
- Precise Class 2A thread fit ensures smooth installation and consistent engagement with mating components
- Full threading along the 3/4" length maximizes grip and distribution of clamping force across the entire fastener
- External hex drive design allows for high-torque installation using standard tools, reducing assembly time and effort
- Compliance with RoHS 3 and REACH regulations guarantees environmental safety and unrestricted use in regulated industries
Professional Applications & Engineering Value
This 1/4"-20 UNC left-hand hex head screw is engineered to address critical challenges in industrial settings where reverse-rotation forces are prevalent. The 18-8 stainless steel material provides excellent resistance to rust and chemical exposure, making it suitable for marine, food processing, and chemical plant applications. Its coarse UNC thread and Class 2A fit ensure quick assembly and reliable performance in high-vibration environments, while the external hex drive facilitates efficient installation with common wrenches. These features collectively reduce maintenance frequency and enhance the longevity of assembled structures, offering a dependable left-hand thread fastener solution for demanding engineering projects.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured from 18-8 stainless steel, featuring a tensile strength of 70,000 psi and Rockwell B70 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.
