S-91185A833 1/4"-28 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual operation with multi-lobe head design for comfortable grip and tool-free tightening/loosening
• Superior corrosion resistance from 18-8 stainless steel construction, ideal for demanding industrial environments
• Precise thread engagement with Class 3A fine UNF threading ensuring secure, vibration-resistant fastening
• Durable head performance featuring black acetal plastic that withstands temperatures from 32° to 180°F
• Maximum fastening versatility through fully threaded design for consistent holding power across the entire length
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe industrial and commercial use
• Right-hand threading compatibility with standard assembly procedures for straightforward installation

Professional Applications & Engineering Value

This 1/4"-28 UNF thumb screw combines 18-8 stainless steel durability with acetal plastic multi-lobe head ergonomics to solve critical industrial fastening challenges. The Class 3A fine threading delivers exceptional precision in applications requiring repeated adjustments, while the corrosion-resistant material ensures longevity in humid or chemical-exposed environments. The black acetal plastic head maintains dimensional stability across temperature variations (32°-180°F), making it ideal for electronic enclosures, machinery panels, and instrumentation where tool-less access is essential. Its fully threaded design provides uniform clamping force, eliminating the need for multiple fastener types in assembly operations.

Specification Summary & Compliance

This thumb screw features 1/4"-28 UNF fine threads with Class 3A thread fit for precision tolerance, right-hand thread direction, and fully threaded 1-1/4" length. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for industrial applications.