S-91185A241 4-40 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with knurled acetal plastic head for secure grip without tools
• Superior corrosion resistance from 18-8 stainless steel construction in humid or chemical environments
• Precise thread engagement with Class 3A fit ensuring reliable fastening in demanding applications
• Low-profile round head design minimizing protrusion while maintaining easy thumb adjustment
• Wide temperature compatibility (32° to 180°F) for stable performance across industrial settings
• Full threading along 1/2" length providing maximum adjustability and holding power
• Environmental compliance meeting RoHS 3 and REACH standards for global supply chain integration

Professional Applications & Engineering Value

Engineered for repetitive adjustment scenarios, this 4-40 UNC thumb screw combines the corrosion resistance of 18-8 stainless steel with the ergonomic advantages of a knurled acetal plastic head. The low-profile round head design prevents snagging in confined spaces while the coarse UNC threads enable rapid installation in soft materials or pre-tapped holes. Ideal for electronic enclosures, medical devices, and instrumentation panels, the Class 3A thread fit maintains positional accuracy under vibration, solving common loosening issues in precision assemblies. The fully threaded 1/2" length offers versatile engagement depth for prototyping and production applications alike.

Specification Summary & Compliance

Manufactured to UNC coarse thread standards with 4-40 thread size and Class 3A thread fit for precision tolerance. The 1/2" length features full threading with right-hand direction. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial markets.