S-91185A957 5/16"-18 x 5/8" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual operation with a comfortable two-arm thumb screw head design for maximum grip without tools
• Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
• Durable, lightweight head made of black acetal plastic that withstands temperatures from 32° to 180° F
• Precise, reliable fastening with Class 3A thread fit and UNC coarse threads for quick assembly and vibration resistance
• Full-length threading ensures consistent engagement and holding power across the entire 5/8" length
• Compliance with strict regulations including RoHS 3 and REACH, ensuring safe use in regulated industries
• Right-hand thread direction for standard, intuitive installation in common applications

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw combines the strength of 18-8 stainless steel with the ergonomic benefits of a black acetal plastic head, making it ideal for frequent-adjustment applications like machinery panels, electronic enclosures, and jig fixtures. The two-arm design provides excellent torque without specialized tools, reducing assembly time and operator fatigue. Its Class 3A thread fit and coarse threading deliver secure fastening even in high-vibration settings, while the fully threaded shank ensures uniform load distribution. Built to resist corrosion and comply with RoHS and REACH, this screw meets the demands of industrial maintenance, OEM equipment, and safety-critical assemblies.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a 5/16"-18 thread size and Class 3A thread fit for precise dimensional accuracy. It is fully threaded and features a right-hand thread direction. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted substances for safe industrial use.