S-91185A831 1/4"-28 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Quick manual adjustments with ergonomic multi-lobe head design requiring no tools
• Superior corrosion resistance from 18-8 stainless steel construction for long service life
• Secure, vibration-resistant fastening with precision Class 3A fine thread fit
• Lightweight, durable head operation using black acetal plastic that withstands repeated use
• Broad temperature compatibility with head functioning from 32°F to 180°F
• Full-thread engagement for maximum holding power along the entire 1" length
• Environmental regulation compliance meeting RoHS 3 and REACH standards

Professional Applications & Engineering Value

This 18-8 stainless steel thumb screw combines the corrosion resistance of marine-grade alloy with the electrical insulation and chemical resistance of black acetal plastic multi-lobe heads. The Class 3A thread fit and 1/4"-28 UNF fine threading deliver exceptional clamping force retention in vibration-prone environments, making these thumb screws ideal for precision instrument panels, electronic enclosures, and medical equipment requiring frequent access. The right-hand threading follows industry standards while the multi-lobe design provides superior grip for technicians wearing gloves, solving the common problem of slippery fasteners in industrial maintenance scenarios.

Specification Summary & Compliance

Manufactured to precise UNF thread standards with Class 3A thread fit for superior dimensional accuracy. Features fully threaded 1" length with 0.25" thread diameter and fine thread spacing. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring restricted substance control.