S-91185A847 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual tightening and loosening with an ergonomic multi-lobe head design, eliminating the need for tools in frequent adjustments.
• Superior corrosion resistance from the 18-8 stainless steel body, ensuring long-term reliability in humid or demanding industrial environments.
• Enhanced grip and durability with a black Acetal Plastic head that withstands temperatures from 32° to 180° F without cracking or deforming.
• Precise and secure fastening thanks to the UNC Class 3A thread fit, providing tight tolerances and reduced risk of cross-threading in coarse thread applications.
• Full threading for versatile installation allows the screw to be used along its entire length, offering flexibility in various assembly depths.
• Right-hand thread direction for standard operation, ensuring compatibility with common industrial practices and reducing assembly errors.
• Compliance with environmental and safety standards, including RoHS 3 and REACH, making it suitable for global markets and sensitive applications.

Professional Applications & Engineering Value

This heavy-duty thumb screw combines the strength of 18-8 stainless steel with the ergonomic advantages of a black Acetal Plastic multi-lobe head, addressing common industrial challenges such as rapid assembly and disassembly without tools. The fully threaded design and UNC coarse thread ensure quick engagement and high load distribution, ideal for applications in machinery, electronics, and enclosures where temperature fluctuations from 32° to 180° F occur. Engineers value its Class 3A thread fit for precision in high-vibration environments, reducing maintenance downtime and enhancing operational efficiency in industrial assembly settings.

Specification Summary & Compliance

This thumb screw features a 5/16"-18 UNC thread with Class 3A fit for precise dimensional accuracy, ensuring reliable performance in coarse threading applications. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming its suitability for environmentally conscious and regulated industries. The specifications include a right-hand thread direction and full threading for consistent fastening integrity.