S-90179A542 1/4"-20 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual operation with a wide spade head and thumb grip, enabling quick tool-free installation and removal in tight spaces.
• Enhanced load distribution and stability thanks to the integrated flange, which acts as a built-in washer to prevent loosening under vibration.
• Superior mechanical strength with a 40,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable performance in demanding industrial applications.
• Wide compatibility and easy engagement with a coarse UNC 1/4"-20 thread and Class 2A fit, facilitating fast assembly with standard components.
• Full-length threading provides consistent grip and holding power along the entire 1-inch shank for secure fastening.
• Durable and corrosion-resistant steel construction offers long-term reliability and repeated use without degradation.
• Environmentally responsible manufacturing with full compliance to RoHS 3 (2015/863/EU) regulations, ensuring safety in sensitive applications.

Professional Applications & Engineering Value

This steel thumb screw is engineered to solve common industrial challenges where speed, reliability, and tool-free access are critical. The flanged spade head design eliminates the need for separate washers, reducing part count and assembly time while providing a larger bearing surface to protect sensitive materials from damage. The coarse UNC thread and Class 2A thread fit ensure quick, secure engagement, even in environments with debris or minor misalignments. Made from high-strength steel with a Rockwell B55 hardness and 40,000 psi tensile strength, it withstands repeated adjustments and high-stress conditions in machinery, electronics enclosures, and jig and fixture applications. Its right-hand thread and full threading make it ideal for frequent assembly and disassembly, offering a robust, user-friendly fastening solution that enhances productivity and reduces maintenance downtime.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a 1/4"-20 thread size and a Class 2A thread fit for consistent dimensional accuracy and interchangeability. It is fully threaded along its 1-inch length and features a flange diameter of 0.438 inches. The product is manufactured in compliance with RoHS 3 (2015/863/EU), ensuring it is free from hazardous substances, and meets industrial specifications for mechanical performance, including the stated tensile strength and hardness ratings.