S-90306A226 1/4"-20 x 1 1/4" 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and outdoor applications
- Exceptional mechanical strength with 70,000 PSI tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
- Secure left-hand threading prevents loosening in counter-clockwise rotating machinery, enhancing operational safety
- Precise Class 2A thread fit ensures smooth assembly and consistent torque application in industrial settings
- Full-length UNC coarse threading provides maximum grip and holding power across the entire fastener length
- External hex drive design allows for high-torque installation with standard tools, reducing assembly time
- Compliance with environmental regulations including RoHS 3 and REACH for safe use in regulated industries
Professional Applications & Engineering Value
This left-hand thread hex head screw delivers critical engineering solutions where reverse-thread security is paramount. The 18-8 stainless steel composition offers excellent resistance to oxidation and chemical exposure, making it suitable for marine equipment, food processing machinery, and chemical plant applications. The UNC coarse threading combined with Class 2A thread fit ensures rapid installation and reliable performance in high-vibration environments. With full threading along the entire 1-1/4" length, this fastener provides uniform stress distribution and superior clamping force, preventing joint failure in heavy-duty assemblies. The external hex drive accommodates standard wrenches for efficient maintenance and disassembly in confined spaces.
Specification Summary & Compliance
This 1/4"-20 UNC left hand hex head screw features precise Class 2A thread fit per ASME B1.1 standards with coarse thread spacing for optimal engagement. Manufacturing specifications include 70,000 PSI tensile strength and Rockwell B70 hardness for consistent mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance in industrial applications worldwide.
