S-94365A340 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 manual grip with flanged design and external hex drive for easy hand-tightening without tools
- Exceptional corrosion resistance thanks to 18-8 stainless steel construction for long-lasting performance in harsh environments
- Reliable thread engagement with Class 2B UNC coarse threads ensuring consistent fastening and vibration resistance
- Enhanced stability and load distribution from the 1/4" flange collar diameter preventing surface damage
- Quick installation efficiency through right-hand thread design and thumb-friendly profile
- Compliance with environmental standards meeting both REACH and RoHS 3 requirements for safe industrial use
- Durable mechanical performance with 5/16" width and 1/4" height providing robust structural integrity
Professional Applications & Engineering Value
This 4-40 UNC flange thumb nut solves critical assembly challenges in industrial environments where manual access and corrosion resistance are paramount. The 18-8 stainless steel construction provides excellent protection against rust and chemical exposure, making it ideal for electrical enclosures, machinery guards, and outdoor equipment. The flanged design with 1/4" collar diameter distributes clamping force effectively, preventing damage to soft materials while the external hex drive and thumb profile enable rapid installation in confined spaces. With Class 2B coarse threads, this thumb nut maintains secure fastening even under vibration, reducing maintenance needs in automotive, aerospace, and manufacturing applications where reliability is non-negotiable.
Specification Summary & Compliance
This flange thumb nut features precision 4-40 UNC coarse threads with Class 2B thread fit ensuring consistent dimensional accuracy. The component meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming environmental safety and regulatory adherence. Manufacturing specifications include right-hand thread direction, 1/4" collar diameter, 1/8" collar height, and 5/16" width, providing reliable performance across industrial fastening applications.
