S-91185A917 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Quick manual operation with two-arm thumb head design for tool-free tightening and adjustment in confined spaces
• Superior corrosion resistance from 18-8 stainless steel construction, ideal for demanding industrial environments
• Enhanced grip and durability with black acetal plastic head that withstands temperatures from 32° to 180°F
• Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
• Maximum holding power through fully threaded design providing complete engagement along the entire 1/2" length
• Environmental compliance meeting RoHS 3 and REACH regulations for safe use across various industries
• Right-hand threading compatibility with standard UNC 1/4"-20 equipment for easy integration

Professional Applications & Engineering Value

These 1/4"-20 thumb screws combine the strength of 18-8 stainless steel with the practical benefits of black acetal plastic heads to solve critical industrial fastening challenges. The Class 3A UNC coarse threads deliver exceptional grip in high-vibration applications, preventing loosening in machinery, electronic enclosures, and assembly fixtures. The two-arm thumb head design enables rapid manual adjustments without tools, significantly reducing maintenance downtime in production environments. With temperature resistance from 32° to 180°F, these thumb screws maintain performance in both indoor and moderate outdoor applications, while the fully threaded construction ensures maximum engagement depth for secure fastening in panel mounting, access covers, and adjustable components.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit standards with UNC 1/4"-20 coarse threading and right-hand thread direction. Features include 1/2" length, 1 1/4" head width, and 5/16" head height. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.