S-93005A570 5/8"-11 x 3" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual torque application with a large four-arm head design (2 1/2" width) for superior grip and easy hand-tightening without tools.
• Exceptional durability and corrosion resistance due to black-oxide steel construction, offering reliable performance in demanding environments.
• High mechanical strength with 180,000 psi tensile strength and Rockwell C40 hardness, ensuring the screw withstands heavy loads and resists deformation.
• Quick and secure fastening enabled by coarse UNC threads and Class 2A fit, providing consistent engagement and reducing cross-threading risks.
• Full threading along the 2 11/16" length allows for maximum adjustability and holding power across the entire fastener.
• Extended tip design facilitates easier alignment and initial engagement in pre-tapped holes or nuts.
• Compliance with international environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use in global supply chains.

Professional Applications & Engineering Value

This heavy-duty thumb screw is engineered to solve common industrial fastening challenges where tool-free assembly and disassembly are critical. The black-oxide steel material provides a protective layer that minimizes rust and wear, extending service life in humid or abrasive conditions. Its coarse UNC thread and Class 2A fit ensure rapid installation with high vibration resistance, making it ideal for machinery covers, access panels, and adjustable fixtures. The four-arm head offers ergonomic handling, reducing operator fatigue during frequent adjustments. With full threading and an extended tip, it delivers precise alignment and consistent clamping force, supporting reliable performance in maintenance-heavy environments such as manufacturing, automotive, and electronic enclosures.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a 5/8"-11 coarse thread and Class 2A thread fit for consistent dimensional accuracy. It is fully threaded with a length of 3" and features a right-hand thread direction. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety requirements for industrial use.