S-90866A005 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
- Enhanced grip and torque application with standard wing profile for hand-tightening without tools, speeding up assembly and disassembly in tight spaces.
- Superior corrosion resistance from zinc-plated steel construction, ensuring long-term durability in humid or industrial environments.
- Reliable thread engagement with Class 2B coarse UNC threads, providing consistent fit and reducing cross-threading risks during installation.
- Right-hand thread direction for intuitive, standard fastening operations, compatible with common industrial equipment and components.
- Optimized dimensions (3/4" width, 3/8" height) for easy handling and space-efficient designs, balancing strength and accessibility.
- Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated markets and reducing liability concerns.
- Robust base diameter (21/64") for stable seating and even load distribution, minimizing loosening under vibration or dynamic loads.
Professional Applications & Engineering Value
This 4-40 UNC thumb nut in zinc-plated steel addresses common assembly challenges by combining manual operability with mechanical reliability. The coarse thread design and Class 2B fit ensure quick installation and secure fastening, even in high-vibration settings like machinery panels, electrical enclosures, and prototyping fixtures. Its standard wing nut profile allows for rapid adjustments without specialized tools, reducing downtime in maintenance-heavy industries. The corrosion-resistant plating extends service life in demanding conditions, while the inch-based sizing guarantees compatibility with North American equipment standards, making it a versatile choice for OEMs and MRO applications requiring efficient, reusable fastening solutions.
Specification Summary & Compliance
This thumb nut features precision 4-40 UNC coarse threads with a Class 2B thread fit for consistent dimensional accuracy per ASME/ANSI standards. The right-hand thread direction and standard profile ensure interchangeability. It is manufactured from zinc-plated steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to environmental and safety requirements for industrial components.
