S-91185A455 1/4"-28 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a knurled acetal plastic head for superior grip in assembly and disassembly without tools
• Exceptional corrosion resistance due to 18-8 stainless steel construction, ensuring longevity in various environments
• Space-saving low-profile design allows use in confined areas while maintaining easy manual operation
• Precise and reliable fastening with Class 3A fine UNF threads, offering tighter tolerances and secure fits
• Full threading for maximum engagement along the entire 3/8" length, providing consistent holding power
• Wide temperature compatibility with a head operating range from 32° to 180°F, suitable for many industrial settings
• Environmental and safety compliance with RoHS 3 and REACH regulations, ensuring safe use in regulated industries

Professional Applications & Engineering Value

This low-profile thumb screw is engineered to address common challenges in precision assembly, such as the need for quick adjustments without specialized tools. The combination of a knurled acetal plastic head and 18-8 stainless steel body delivers a durable, corrosion-resistant fastening solution ideal for electronics, machinery, and instrumentation. The fine UNF thread and Class 3A fit ensure minimal backlash and vibration resistance, critical in applications requiring repeated manual handling. Its fully threaded design and compact head profile make it perfect for access-limited environments, reducing installation time and enhancing operational efficiency in industrial maintenance and prototyping.

Specification Summary & Compliance

This thumb screw adheres to UNF thread standards with a Class 3A thread fit for high precision. It features a 1/4"-28 fine thread, 3/8" length, and is fully threaded. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets strict environmental and safety regulations for industrial use.