S-93575A311 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 due to 316 stainless steel construction
- Quick and tool-free installation/removal with the standard wing profile for hand-tightening efficiency
- Reliable thread engagement and consistent performance ensured by the Class 2B thread fit
- Robust and secure fastening for industrial applications with a substantial 3/4" width and coarse UNC threading
- Wide compatibility with standard 4-40 UNC male threads, simplifying sourcing and assembly
- Compliance with major environmental regulations (RoHS 3 & REACH) for use in regulated industries
- Durable, long-lasting performance with a right-hand thread direction for standard applications
Professional Applications & Engineering Value
This 4-40 UNC Thumb Nut in 316 Stainless Steel is engineered to solve critical challenges in maintenance-heavy and corrosive industrial settings. The wing nut head shape allows for rapid manual adjustments without tools, drastically reducing downtime during equipment servicing or panel access. Its coarse thread design is less prone to clogging with debris compared to fine threads, making it ideal for environments like marine, chemical processing, and food machinery where cleanliness and speed are paramount. The exceptional corrosion resistance of 316 stainless steel ensures the fastener's integrity is maintained, preventing seizure and failure, which is a common pain point with inferior materials. This combination of easy operation and durability delivers significant engineering value by enhancing operational efficiency and reducing long-term replacement costs.
Specification Summary & Compliance
This thumb nut features a 4-40 UNC coarse thread with a Class 2B thread fit, ensuring dimensional accuracy and proper interchangeability. The base diameter is 21/64" with a total height of 3/8". It is manufactured from 316 Stainless Steel and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industrial applications.
