S-93005A551 1/4"-20 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Tool-free operation with four-arm head design for quick manual tightening and loosening in confined spaces
• Superior corrosion resistance from black-oxide steel finish, extending service life in demanding industrial environments
• Exceptional mechanical strength with 180,000 psi tensile strength and Rockwell C40 hardness for heavy-duty applications
• Reliable thread engagement with Class 2A fit UNC coarse threads ensuring consistent fastening performance
• Full-length threading provides maximum grip along the entire 1" length for secure component attachment
• Precise alignment capability with extended tip design facilitating easier insertion and positioning
• Regulatory compliance meeting RoHS 3 and REACH standards for use in regulated industries

Professional Applications & Engineering Value

This black-oxide steel thumb screw delivers exceptional value in industrial settings where frequent adjustments and reliable fastening are critical. The four-arm head design eliminates the need for tools, enabling rapid maintenance and reducing downtime in equipment servicing applications. The UNC coarse thread pattern with Class 2A fit ensures smooth engagement and disengagement, even in high-vibration environments. With fully threaded construction and extended tip, installation becomes significantly faster while maintaining precise alignment in machinery, electronic enclosures, and fabrication jigs. The combination of 180,000 psi tensile strength and Rockwell C40 hardness provides durability against mechanical stress, making it ideal for repeated use in manufacturing, automation, and maintenance operations where reliability cannot be compromised.

Specification Summary & Compliance

This 1/4"-20 thumb screw features precise Class 2A thread fit according to UNC standards, ensuring dimensional accuracy and proper fastening performance. The manufacturing complies with RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in steel and REACH (EC 1907/2006) compliance as of June 14, 2023. The right-hand thread direction and coarse thread spacing provide optimal performance for industrial applications requiring robust threaded fasteners.