S-91746A636 4-40 x 1/2" Thumb Screws
Thumb 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
- Effortless hand-tightening with a knurled round head for superior grip in tight spaces or when tools are unavailable
- Excellent corrosion resistance provided by 18-8 Stainless Steel, ensuring long-term reliability in various environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for durable, load-bearing applications
- Precise and reliable threading with a Class 2A UNC coarse thread fit, enabling easy engagement and secure fastening
- Streamlined assembly process due to the fully threaded design and right-hand thread direction for standard installation
- Low-profile head design that minimizes protrusion, making it ideal for applications with limited clearance
- Compliance with environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets
Professional Applications & Engineering Value
This 4-40 UNC thumb screw is engineered to solve common industrial challenges where tool-less adjustment and reliable fastening are critical. The 18-8 Stainless Steel construction offers inherent corrosion resistance, making it suitable for electronics enclosures, instrumentation panels, and machinery subjected to humid or corrosive conditions. The knurled round head provides a secure, non-slip surface for manual tightening, reducing assembly time and eliminating the need for specialized tools. With a coarse UNC thread and Class 2A fit, it ensures quick alignment and robust holding power in applications like access panels, clamps, and adjustable components, enhancing operational efficiency and maintenance accessibility.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. Key specifications include a 4-40 thread size, 1/2" length, 5/16" head diameter, and full threading. It is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries.
