S-90866A129 1/4"-28 Thumb Nuts

Key Features & Benefits at a Glance

• Quick manual installation and removal with standard wing profile for tool-free operation in tight spaces
• Superior corrosion resistance thanks to zinc-plated steel construction for extended service life
• Precise, reliable fastening ensured by Class 2B thread fit and 1/4"-28 UNF fine thread design
• Enhanced grip and torque application from the 1 1/8" width wing design
• Broad compatibility with standard UNF threaded components for versatile industrial use
• Secure environmental compliance with RoHS 3 standards for safe manufacturing applications
• Optimized stability from the 31/64" base diameter providing a solid seating surface

Professional Applications & Engineering Value

This zinc-plated steel thumb nut delivers exceptional performance in industrial settings where frequent adjustments and reliable fastening are critical. The 1/4"-28 UNF fine thread provides superior vibration resistance and precise engagement, making it ideal for machinery, electrical enclosures, and assembly jigs that require repeated manual handling. The standard wing nut profile ensures comfortable, high-torque operation without tools, reducing installation time and minimizing cross-threading risks. Its robust zinc-plated finish protects against rust and corrosion in demanding environments, while the 31/64" base diameter offers enhanced load distribution. Engineers value this thumb nut for maintenance panels, prototyping, and equipment where quick access and Class 2B thread fit accuracy are paramount.

Specification Summary & Compliance

This thumb nut features precision 1/4"-28 UNF fine threads with Class 2B thread fit for consistent dimensional accuracy per UNF standards. The right-hand thread direction and 31/64" base diameter ensure reliable performance in inch-based systems. Manufacturing complies with RoHS 3 (2015/863/EU) regulations, guaranteeing environmental safety for industrial fastener applications.