S-95955A301 1/4"-20 x 3/8" Left-Hand-Thread Stainless Steel Button Head Hex-Drive Screws
Left-Hand-Thread Stainless Steel Button Head Hex-Drive 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 long-term reliability
- Superior mechanical strength offering 80,000 PSI tensile strength and Rockwell B85 hardness for demanding load-bearing applications
- Secure left-hand threading prevents loosening under counter-clockwise rotation in specialized machinery and equipment
- Precise Class 2A thread fit ensures consistent engagement and reliable fastening in UNC coarse thread assemblies
- Easy installation and removal with 5/32" hex drive and rounded button head design for streamlined maintenance
- Full threading coverage along the 3/8" length provides maximum grip and uniform stress distribution
- Regulatory compliance with RoHS 3 and REACH standards for safe use in global industrial markets
Professional Applications & Engineering Value
This left-hand threaded screw addresses critical reverse-rotation challenges in industrial settings where standard right-hand threads would loosen under specific operational forces. The 18-8 stainless steel construction delivers reliable corrosion resistance in moist or chemical-exposed environments, while the UNC coarse thread design enables rapid assembly in softer materials or high-vibration applications. The combination of 80,000 PSI tensile strength and Class 2A thread fit ensures consistent performance in machinery, automotive components, and specialized equipment requiring left-hand fastening solutions. The rounded button head with hex drive provides both aesthetic appeal and practical tool engagement for maintenance-intensive operations.
Specification Summary & Compliance
This fully threaded screw maintains Class 2A thread fit per UNC standards with precise 1/4"-20 coarse threading. Manufacturing adheres to inch system dimensions including 3/8" length, 0.437" head diameter, and 5/32" hex drive. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency for industrial procurement.
