S-90181A550 1/4"-20 x 2" Thumb Screws

Key Features & Benefits at a Glance

• Quick manual installation and removal with the large spade head design requiring no tools
• Superior durability and wear resistance from high-carbon steel with a Rockwell B55 hardness rating
• Reliable load-bearing performance supported by a robust 40,000 psi tensile strength
• Fast assembly and secure fit with coarse UNC threads and a precision Class 2A thread fit
• Maximum grip and engagement along the entire 2-inch length due to the fully threaded design
• Versatile right-hand threading compatible with standard industrial components and equipment
• Safe for regulated environments as it is fully RoHS 3 compliant, containing no restricted hazardous substances

Professional Applications & Engineering Value

This 1/4-20 UNC thumb screw is engineered to solve common industrial fastening challenges where tools are impractical or speed is critical. The steel construction and Rockwell B55 hardness ensure it withstands repeated use without stripping or deforming, making it ideal for access panels, machine guards, and electronic enclosures that require frequent maintenance. The coarse thread and Class 2A fit provide rapid installation and a secure hold in various materials, reducing assembly time while preventing cross-threading. Its spade head offers excellent leverage for hand-tightening, eliminating the need for drivers in tight spaces. This combination of high-strength materials and user-friendly design delivers reliable performance in manufacturing, aerospace, and automotive applications where both durability and accessibility are paramount.

Specification Summary & Compliance

This thumb screw adheres to Unified National Coarse (UNC) thread standards with a 1/4"-20 thread size and a Class 2A tolerance for consistent, interchangeable fits. Manufacturing complies with industry standards for dimensional accuracy, including a 2-inch length and fully threaded right-hand design. The product is RoHS 3 (2015/863/EU) Compliant, ensuring it meets strict environmental regulations for hazardous substance restrictions, making it suitable for global industrial and electronic applications.