S-91833A158 1/4"-20 Thumb Nuts

Key Features & Benefits at a Glance

• Superior manual grip with deep knurling for secure handling without tools in demanding environments
• Excellent corrosion resistance from 18-8 stainless steel construction, ideal for harsh or outdoor applications
• Precise thread engagement with Class 2B UNC coarse threads ensuring reliable fastening and vibration resistance
• Quick installation and adjustment through partial threading and right-hand direction for efficient assembly workflows
• Durable, heavy-duty performance with a 3/4" head diameter and 1/2" collar providing robust structural support
• Compliance with global standards including REACH and RoHS 3 for safe, environmentally responsible usage
• Versatile inch-system compatibility with standard UNC threading for broad industrial equipment integration

Professional Applications & Engineering Value

This 1/4"-20 UNC thumb nut delivers critical advantages in industrial settings where tool-free access and corrosion resistance are paramount. The 18-8 stainless steel material prevents rust in humid or chemical-exposed environments, while the deep knurling ensures a firm grip even with oily hands or gloves. Its partially threaded design allows for rapid positioning on shafts or studs in machinery, enclosures, and electrical panels. The coarse UNC thread resists loosening under vibration, making it ideal for maintenance-heavy applications. Engineers value this thumb nut for reducing assembly time and enhancing serviceability in automotive, marine, and manufacturing equipment without compromising on durability or regulatory compliance.

Specification Summary & Compliance

This thumb nut adheres to UNC thread standards with a Class 2B thread fit for consistent engagement and dimensional accuracy. Key specifications include a 1/4"-20 thread size, 1/2" collar diameter, and 3/4" total height. The product is manufactured to comply with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) directives, ensuring it is free of hazardous substances and suitable for global supply chains. All measurements conform to inch-system requirements for seamless integration with industrial fastening systems.