S-91833A112 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
- Excellent grip and easy hand-tightening thanks to the knurled round head design, reducing tool dependency
- Reliable thread engagement with Class 2B thread fit ensuring consistent performance and vibration resistance
- Versatile coarse UNC threading (4-40) for quick assembly and disassembly in various applications
- Durable partial threading providing secure fastening while minimizing material usage and weight
- Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable usage
- Standard inch system compatibility for seamless integration with existing equipment and components
Professional Applications & Engineering Value
This 4-40 UNC thumb nut is engineered to address common assembly challenges in industrial settings where frequent adjustments or tool-free operation are required. The 18-8 Stainless Steel material offers exceptional resistance to rust and corrosion, making it suitable for outdoor, marine, or chemical-exposed applications. The knurled round head provides a secure grip even with gloved hands, reducing slippage and improving operator efficiency. With its partially threaded design and coarse UNC thread, it ensures rapid installation and removal, minimizing downtime in production lines, machinery maintenance, and electronic enclosures. The Class 2B thread fit guarantees precise alignment and reliable performance under vibration, enhancing the longevity of assembled components.
Specification Summary & Compliance
This thumb nut features a 1/4" knurled round head with standard profile, 1/4" collar diameter, and 3/8" height. It utilizes a 4-40 UNC coarse thread with Class 2B tolerance for accurate fit, right-hand thread direction, and 1/4" thread depth. Manufactured in accordance with inch system standards, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety requirements.
