S-91185A471 1/4"-28 x 7/8" Thumb Screws

Key Features & Benefits at a Glance

• Superior hand-tightening grip with knurled acetal plastic head that prevents slipping and allows for quick adjustments without tools
• Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for humid or washdown environments
• Precise thread engagement with Class 3A fine thread fit ensuring secure fastening and vibration resistance
• Low-profile design provides clearance in tight spaces while maintaining ample surface area for comfortable manual operation
• Wide temperature compatibility with head operating range from 32° to 180° F for diverse industrial settings
• Full threading capability enables maximum adjustment flexibility and consistent clamping force along entire length
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global manufacturing applications

Professional Applications & Engineering Value

This low-profile thumb screw combines the corrosion-resistant properties of 18-8 stainless steel with the exceptional grip of a knurled acetal plastic head to solve critical industrial challenges. The Class 3A thread fit and UNF fine threading provide superior vibration resistance in precision equipment, electronic enclosures, and medical devices where reliable, tool-free adjustments are essential. The acetal head material maintains dimensional stability across the operating temperature range while the knurled texture ensures positive grip even with gloved hands. Engineered for applications requiring frequent access panels, calibration adjustments, or modular component assemblies, this thumb screw delivers consistent performance in manufacturing, aerospace, and laboratory environments where precision and reliability are paramount.

Specification Summary & Compliance

This 1/4"-28 UNF thumb screw features precision Class 3A thread fit with fine thread spacing and right-hand threading. The assembly combines an 18-8 stainless steel fully threaded body with a 3/4" diameter acetal plastic knurled head in low-profile configuration. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for restricted substance-sensitive applications across global markets.