S-91404A540 1/4"-20 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with a 1 3/8" wide wing head design for easy hand-tightening without tools.
• Superior corrosion resistance provided by the zinc-plated iron construction, extending service life in various environments.
• Quick and reliable installation enabled by the coarse UNC 1/4"-20 thread and Class 2A fit for faster assembly and disassembly.
• Full-length threading ensures consistent engagement and holding power along the entire 3/4" length for secure fastening.
• Right-hand thread direction offers intuitive, standard operation compatible with most industrial applications.
• Compliance with strict environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use.
• Precise dimensional control with head diameter tolerance of -0.0156" to 0.0156" for consistent fit and performance.

Professional Applications & Engineering Value

This zinc-plated iron wing thumb screw is engineered to address the need for rapid, tool-free fastening in industrial settings. The UNC coarse thread and Class 2A fit provide excellent engagement in a variety of materials, reducing the risk of cross-threading and speeding up maintenance cycles. Its wing head design offers maximum leverage for hand-tightening, making it ideal for applications requiring frequent adjustments or quick release, such as access panels, machinery guards, and electronic enclosures. The zinc plating adds a protective layer that resists rust and corrosion, ensuring reliable performance in environments exposed to moisture or chemicals. By combining ease of use with robust construction, this thumb screw minimizes downtime and enhances operational efficiency in assembly lines, repair shops, and equipment manufacturing.

Specification Summary & Compliance

This thumb screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit, ensuring standard dimensional accuracy and reliable performance. The product is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for hazardous substances. Key specifications include a head diameter of 7/16" with a tolerance of -0.0156" to 0.0156", fully threaded design, and right-hand thread direction, providing consistent quality for industrial fastening applications.