S-91185A459 1/4"-28 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior hand-tightening grip with knurled acetal plastic head for secure operation without tools
• Exceptional corrosion resistance from 18-8 stainless steel construction for long-term reliability in demanding environments
• Precise thread engagement with Class 3A UNF fine threads ensuring vibration-resistant fastening
• Low-profile design with 5/16" head height for space-constrained applications
• Wide temperature compatibility (32° to 180°F) maintaining performance across various operating conditions
• Full threading providing maximum adjustment range and holding power
• Regulatory compliance with RoHS 3 and REACH standards for environmentally conscious manufacturing

Professional Applications & Engineering Value

This low-profile thumb screw combines the corrosion-resistant properties of 18-8 stainless steel with the excellent grip characteristics of a knurled acetal plastic head, making it ideal for frequent adjustment applications in electronics enclosures, industrial equipment panels, and precision instruments. The Class 3A UNF fine thread ensures precise fitment and vibration resistance, while the 3/4" head diameter provides ample surface area for comfortable manual operation. Engineers value this fully threaded thumb screw for its ability to maintain consistent performance across temperature variations from 32° to 180°F, eliminating the need for specialized tools in maintenance-heavy environments and reducing assembly time in production settings.

Specification Summary & Compliance

This thumb screw features precision 1/4"-28 UNF Class 3A threads with right-hand threading direction and fine thread spacing. The fastener is fully threaded with a length of 1/2" and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards. Manufacturing follows UNF thread standards with the Class 3A fit ensuring tight tolerances for reliable performance in industrial applications.