S-91185A398 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Superior grip and torque application with a knurled Acetal plastic head that resists slipping, even in oily or high-vibration environments
• Exceptional corrosion resistance provided by 18-8 Stainless Steel construction, ensuring long-term reliability in various industrial settings
• Precise and secure fastening with a Class 3A thread fit and 1/4"-20 UNC coarse threads, offering excellent engagement and reduced cross-threading risk
• Easy manual operation in tight spaces due to the low-profile, round head design, ideal for applications requiring frequent adjustments
• Broad thermal compatibility with a head temperature range of 32° to 180° F, suitable for many standard operating environments
• Full-threaded length for maximum holding power, ensuring the screw can be securely fastened along its entire 1/2" length
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications

Professional Applications & Engineering Value

This low-profile thumb screw is engineered to solve common assembly challenges where tool-less, manual fastening is preferred. The combination of a durable 18-8 stainless steel body and a knurled Acetal plastic head provides an optimal balance of strength and user comfort. The coarse UNC threads and Class 3A fit enable quick installation with high resistance to stripping, making it ideal for securing panels, access doors, and electronic enclosures in industries like electronics, automotive, and machinery. Its fully threaded design ensures consistent clamping force, while the right-hand thread direction offers intuitive operation for standard applications, enhancing workflow efficiency and reducing assembly time.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 3A thread fit for precision and reliability. Key dimensional specifications include a 1/4"-20 thread size, 1/2" length, and a low-profile round head. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated markets.