S-91185A803 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior hand-tightening grip with multi-lobe acetal plastic head design for tool-free operation and reduced assembly time
• Excellent corrosion resistance from 18-8 stainless steel construction, ideal for demanding industrial environments
• Precise thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Wide temperature tolerance (32° to 180°F) for reliable performance across various operating conditions
• Enhanced durability through fully threaded 1/2" length providing maximum holding power
• Chemical-resistant black acetal head maintaining appearance and functionality in harsh conditions
• Regulatory compliance meeting RoHS 3 and REACH standards for safe global usage

Professional Applications & Engineering Value

This 1/4"-20 thumb screw combines 18-8 stainless steel threading with an acetal plastic multi-lobe head to solve critical industrial challenges. The fully threaded UNC coarse thread design ensures rapid installation and removal in equipment maintenance, electronic enclosures, and machinery access panels where frequent adjustments are required. The Class 3A thread fit provides superior vibration resistance compared to standard fasteners, preventing loosening in dynamic applications. The black acetal head offers excellent electrical insulation and chemical resistance, making it ideal for electrical assemblies and corrosive environments. This right-hand threaded screw delivers reliable performance while meeting strict industry compliance requirements.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit standards with UNC 1/4"-20 coarse threading and fully threaded 1/2" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety. The 18-8 stainless steel construction ensures consistent performance while the acetal plastic head maintains integrity across specified temperature ranges.