S-90179A587 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual tightening and loosening with the large spade head design, eliminating the need for tools in frequent adjustment applications
• Enhanced load distribution and anti-slip performance thanks to the integrated flange that acts as a built-in washer
• Superior durability and resistance to wear provided by the steel construction with a Rockwell B55 hardness rating
• High mechanical strength for demanding applications, with a tensile strength of 40,000 psi to prevent stripping or failure
• Quick and reliable installation enabled by the coarse UNC thread and Class 2A fit, ensuring smooth engagement
• Maximum thread engagement and holding power from the fully threaded shank along the entire 1 1/2" length
• Safe for use in regulated environments as it is RoHS 3 compliant, meeting strict environmental and safety standards

Professional Applications & Engineering Value

This 5/16"-18 UNC Spade Thumb Screw is engineered to solve critical challenges in industrial assembly and maintenance. The steel construction and Rockwell B55 hardness provide exceptional resistance to deformation, making it ideal for high-vibration environments where fasteners can loosen over time. The flanged design eliminates the need for a separate washer, speeding up installation on panels, machinery access doors, and electronic enclosures. Its coarse UNC thread and right-hand direction offer quick, tool-free operation for applications requiring frequent disassembly, such as prototyping fixtures, industrial controls, and commercial equipment servicing. This combination of high tensile strength and user-friendly design delivers reliable performance while reducing labor time and tool dependency.

Specification Summary & Compliance

This thumb screw adheres to Unified Coarse (UNC) thread standards with a Class 2A thread fit for consistent, reliable engagement. The dimensional specifications include a 5/16"-18 thread size, 1 1/2" length, and a 0.563" flange diameter. It is manufactured to meet industry requirements and is fully RoHS 3 (2015/863/EU) Compliant, ensuring it is free of hazardous substances for use in various industrial and commercial settings.