S-91185A827 1/4"-28 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Quick manual operation with multi-lobe thumb head design for tool-free tightening in confined spaces
• Superior corrosion resistance from 18-8 stainless steel construction for long-term reliability in harsh environments
• Enhanced grip comfort with black acetal plastic head that remains stable across 32°-180°F temperature ranges
• Precise thread engagement through UNF Class 3A fine threads ensuring vibration-resistant connections
• Full threading versatility allowing installation at any point along the 3/4" length for flexible positioning
• Regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Right-hand thread standardization providing familiar installation for maintenance personnel

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw delivers exceptional value in applications requiring frequent adjustments or tool-less maintenance. The multi-lobe black acetal plastic head combines ergonomic comfort with chemical resistance, while the 1/4"-28 UNF Class 3A fine thread maintains precise alignment in vibration-prone environments. Engineers specify this fully threaded design for industrial equipment, electronic enclosures, and precision instruments where reliable, hand-tightened fastening is critical. The stainless steel construction prevents galvanic corrosion when mating with dissimilar metals, extending service life in manufacturing and outdoor applications.

Specification Summary & Compliance

Manufactured to UNF Class 3A thread standards with precise 1/4"-28 fine thread spacing and right-hand direction. The 3/4" fully threaded length ensures consistent engagement depth. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety. The acetal plastic head maintains integrity across operational temperatures from 32° to 180°F.