S-91185A418 1/4"-20 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and comfort with knurled acetal plastic head for secure manual operation without tools
• Superior corrosion resistance from 18-8 stainless steel construction for long-lasting performance in demanding environments
• Precise, reliable fastening with Class 3A thread fit ensuring tight tolerances and reduced vibration loosening
• Easy installation in confined spaces thanks to the low-profile round head design requiring minimal clearance
• Durability across temperature variations with operational stability from 32° to 180°F
• Quick assembly and adjustment facilitated by coarse UNC 1/4"-20 threads and fully threaded shank
• Compliance with international standards including RoHS 3 and REACH for safe use in regulated industries

Professional Applications & Engineering Value

This low-profile thumb screw combines the strength of 18-8 stainless steel with the ergonomic advantage of a knurled acetal plastic head, addressing common industrial challenges such as frequent adjustments and tool-less access. The fully threaded design and coarse UNC threads ensure rapid installation and high resistance to cross-threading, making it ideal for electronics enclosures, machinery panels, and laboratory equipment where repeated access is required. Its right-hand thread direction and Class 3A fit provide consistent, reliable clamping force, reducing maintenance needs in vibration-prone applications while the material selection prevents galvanic corrosion when used with dissimilar metals.

Specification Summary & Compliance

This thumb screw features a 1/4"-20 UNC coarse thread with Class 3A fit for high precision in inch system applications. It is manufactured from 18-8 stainless steel with an acetal plastic head and is fully threaded for maximum engagement. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial components.