S-92741A100 4-40 Thumb Nuts
Thumb Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Finish & Compliance Parameters
Geometric Parameters
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Key Features & Benefits at a Glance
- Enhanced manual grip with knurled round head for secure handling without tools in tight spaces.
- Superior corrosion resistance due to brass construction, ideal for humid or corrosive industrial environments.
- Reliable thread engagement with fully threaded UNC coarse design, ensuring maximum torque resistance and vibration resistance.
- Stable flange base increases bearing surface, distributing load evenly and preventing surface damage.
- Precise Class 2B thread fit guarantees smooth assembly and consistent performance with standard 4-40 male threads.
- RoHS 3 compliant material meets environmental regulations, safe for electronics and sensitive applications.
- Compact 1/4" height and 5/16" collar offers space-saving installation without compromising strength.
Professional Applications & Engineering Value
This 4-40 UNC brass thumb nut is engineered for applications requiring frequent adjustments and high durability. The flanged design and knurled head provide exceptional grip, reducing installation time in assembly lines, electronic enclosures, and machinery panels. Made from RoHS compliant brass, it resists corrosion and oxidation, extending service life in demanding conditions like marine or outdoor equipment. The fully threaded coarse UNC profile and Class 2B threading ensure quick, secure fastening with standard components, minimizing loosening from vibrations. Ideal for use in industrial thumb nuts applications where precision and manual operation are critical, this nut delivers consistent performance in prototyping, HVAC systems, and consumer electronics.
Specification Summary & Compliance
This thumb nut features a 4-40 UNC coarse thread with Class 2B fit for precise tolerance, right-hand direction, and full threading. Dimensions include a 5/16" collar diameter, 1/4" height, and 3/8" head diameter. It complies with RoHS 3 (2015/863/EU) under exemption 6(c) for lead in copper alloys, ensuring environmental safety and industry-standard reliability in manufacturing.
