S-92741A204 1/4"-28 Thumb Nuts

Key Features & Benefits at a Glance

• Effortless manual installation and removal with a knurled round head design for superior grip without tools
• Enhanced load distribution and vibration resistance thanks to the integrated flange that acts like a built-in washer
li>Superior corrosion resistance and electrical conductivity from high-quality brass construction
• Reliable, precision fine threading with a 1/4"-28 UNF Class 2B thread fit for secure fastening in demanding applications
• Optimal thread engagement and strength due to the fully threaded design from end to end
• Compliance with major environmental and safety standards, including REACH and RoHS 3, for use in regulated industries
• Durable, long-lasting performance in a compact 3/8" height and 15/32" collar diameter for space-constrained assemblies

Professional Applications & Engineering Value

This brass thumb nut is engineered to solve critical challenges in manual fastening applications where tool access is limited or speed is essential. The flanged design eliminates the need for a separate washer, providing a larger bearing surface that prevents loosening under vibration and protects sensitive surfaces from damage. The knurled head texture offers a secure, non-slip grip even with oily hands or gloves, enhancing operator safety and efficiency on the production line. Made from corrosion-resistant brass, it is ideal for electrical enclosures, marine equipment, and plumbing systems where fine UNF threading ensures a tight, leak-resistant seal. Its fully threaded, right-hand design and Class 2B fit guarantee consistent performance and easy installation in prototypes, machinery panels, and frequently adjusted fixtures.

Specification Summary & Compliance

This thumb nut features a 1/4"-28 UNF fine thread with a Class 2B thread fit for standard tolerance and reliable engagement. It is manufactured to standard inch system specifications with a round, flanged profile, a collar diameter of 15/32", and a total height of 3/8". The product is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) directives, ensuring it is free from hazardous substances and safe for use in environmentally conscious and regulated industrial applications.