S-91833A141 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 with 18-8 stainless steel construction, ideal for harsh industrial environments.
- Enhanced manual torque application thanks to the knurled head texture providing a secure, non-slip grip.
- Quick and easy hand installation/removal with a standard round profile and generous 3/4" head diameter.
- Reliable thread engagement ensured by full UNC coarse threading and a Class 2B thread fit for consistent performance.
- Broad compatibility with inch-system components using common 4-40 right-hand threads.
- Durable and long-lasting performance from a one-piece, fully threaded design that resists wear and deformation.
- Compliance with stringent safety standards, including REACH and RoHS 3, for use in regulated industries.
Professional Applications & Engineering Value
This 18-8 stainless steel thumb nut is engineered to solve common challenges in maintenance, prototyping, and equipment assembly where tools are impractical. The fully threaded 4-40 UNC coarse thread provides rapid engagement and high resistance to vibrational loosening, while the knurled grip on the round head ensures positive control even with greasy hands or gloves. Its stainless steel material offers excellent durability and corrosion resistance, making it a reliable choice for electrical enclosures, machinery panels, and frequently adjusted fixtures. This combination of features delivers significant value by reducing assembly time, minimizing the need for specialized tools, and providing a robust, long-lasting fastening solution for industrial and engineering applications.
Specification Summary & Compliance
This thumb nut features a 4-40 UNC coarse thread with a Class 2B thread fit for standard inch-system applications. Key dimensions include a 3/4" head diameter, 1/4" collar diameter, and a total height of 3/8". The product is manufactured in compliance with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) directives, ensuring it meets current environmental and safety standards for industrial components.
