S-93005A581 1/4"-20 x 2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a four-arm thumb head design for maximum torque application without tools
• Superior corrosion resistance thanks to the black-oxide steel finish, extending service life in industrial environments
• High-strength durability with 180,000 psi tensile strength and Rockwell C40 hardness for reliable performance under heavy loads
• Quick and secure fastening enabled by UNC coarse threads and Class 2A fit, ensuring precise engagement and vibration resistance
• Full-threaded design for consistent grip along the entire 2" length, providing uniform clamping force
• Extended tip for easy alignment, reducing installation time and preventing cross-threading in assembly applications
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common industrial challenges such as frequent adjustments and high-torque requirements in machinery, electronics, and automotive assemblies. The four-arm head design allows for rapid hand-tightening, eliminating the need for tools in tight spaces and reducing assembly time. Made from high-strength steel with a Rockwell C40 hardness, it withstands repetitive use and mechanical stress, while the UNC coarse thread and Class 2A fit ensure reliable thread engagement and resistance to loosening under vibration. The black-oxide coating provides an added layer of corrosion protection, making it ideal for environments exposed to moisture or chemicals. Fully threaded and featuring an extended tip, this screw simplifies alignment and enhances clamping efficiency in industrial thumb screw applications, from panel fastening to equipment maintenance.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a Class 2A thread fit for precise dimensional accuracy and compatibility. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental safety. Manufacturing specifications include a thread size of 1/4"-20, full threading, and right-hand direction, designed for consistent performance in industrial fastening applications.