S-93005A557 3/8"-16 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to the black-oxide steel finish, extending service life in demanding industrial environments.
• Exceptional mechanical strength with a Rockwell C40 hardness and 180,000 psi tensile strength for reliable performance under high stress.
• Effortless hand-tightening and loosening provided by the large four-arm head design, eliminating the need for tools in frequent adjustments.
• Precise and secure fastening ensured by the Class 2A thread fit and UNC coarse thread, offering excellent engagement and vibration resistance.
• Maximum thread engagement due to the fully threaded design, providing consistent clamping force along the entire 2 1/2" length.
• Easy alignment and insertion facilitated by the extended tip, speeding up assembly in hard-to-reach or blind applications.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.

Professional Applications & Engineering Value

This 3/8"-16 UNC thumb screw is engineered to solve critical fastening challenges in industrial settings. The black-oxide steel construction provides a durable barrier against rust and corrosion, making it ideal for machinery, electronic enclosures, and outdoor equipment where environmental exposure is a concern. The four-arm head offers a significant ergonomic advantage, allowing operators to apply high torque by hand without tools, which is crucial for maintenance panels, access doors, and frequently adjusted components. The fully threaded right-hand design and Class 2A thread fit ensure reliable, vibration-resistant connections, preventing loosening in dynamic applications. Its high tensile strength and hardness guarantee that it maintains integrity under heavy loads, providing long-term reliability and reducing downtime.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy and reliable performance. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries and international markets.