S-99937A101 4-40 Thumb Nuts
Thumb Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
Geometric Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction.
- Effortless manual tightening and adjustment provided by the knurled round head for enhanced grip.
- Increased stability and load distribution from the integrated flange, helping to prevent loosening.
- Reliable and consistent thread engagement ensured by the Class 2B thread fit and coarse UNC threading.
- Broad compatibility with standard 4-40 UNC male threads for versatile use.
- Durable, long-lasting performance with full threading for secure fastening across the entire nut height.
- Safe for regulated industries with full compliance to REACH and RoHS 3 environmental standards.
Professional Applications & Engineering Value
This 4-40 UNC thumb nut is engineered to solve critical challenges in industrial assembly and maintenance. The 316 stainless steel material offers exceptional resistance to corrosion, pitting, and chemicals, making it ideal for applications in marine, chemical processing, and food-grade equipment where moisture and corrosive agents are prevalent. The flanged design provides a larger bearing surface, distributing clamp load effectively and reducing the risk of surface damage or vibration-induced loosening. Combined with the knurled round head, it allows for quick, tool-free installation and removal, saving valuable time in field service, electronic enclosures, and machinery adjustments. Its coarse thread and Class 2B fit ensure rapid assembly and reliable performance, even in high-vibration environments.
Specification Summary & Compliance
This thumb nut features a 4-40 UNC thread with coarse spacing and a Class 2B thread fit for standard inch-sized applications. Key dimensions include a 1/4" height, 5/16" head diameter, and a 1/4" collar diameter. The product is manufactured in compliance with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU), ensuring it meets stringent environmental and safety regulations for industrial components.
