S-91746A764 1/4"-20 x 1 5/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and slip resistance from the knurled round head design, enabling secure hand-tightening without tools
• Superior corrosion resistance provided by 18-8 Stainless Steel, ideal for harsh or moist industrial environments
• High mechanical strength and durability with 80,000 psi tensile strength and Rockwell B83 hardness for reliable, long-term performance
• Quick and easy installation due to UNC coarse threading and Class 2A thread fit, ensuring smooth engagement and reduced assembly time
• Versatile low-profile design with a round head that fits in tight spaces while providing ample surface for manual operation
• Secure and stable fastening from partially threaded shank, minimizing cross-threading and improving alignment in applications
• Compliance with international environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use in regulated industries

Professional Applications & Engineering Value

This 1/4"-20 thumb screw in 18-8 Stainless Steel is engineered to address common industrial challenges such as frequent adjustments, corrosion in demanding settings, and the need for tool-free operation. The knurled round head offers exceptional manual grip, reducing slippage and operator fatigue during repeated hand-tightening in machinery, enclosures, or electronic assemblies. Its UNC coarse thread and Class 2A thread fit provide reliable engagement in various materials, preventing stripping and ensuring consistent clamping force. With a low-profile design and partial threading, it is ideal for applications requiring precise depth control and easy access, such as panel fastening, prototyping, and maintenance covers, where durability and user convenience are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufacturing specifications include a thread size of 1/4"-20, coarse thread spacing, and a length of 1 5/8", supporting reliable performance in industrial fastening applications.