S-91882A419 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip and torque application with a 1" diameter knurled head, reducing slippage during frequent adjustments
• Superior corrosion resistance and durability thanks to the black-oxide steel finish, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under heavy loads
• Easy installation and precise fit with Class 2A UNC coarse threads, providing consistent engagement in various materials
• Fully threaded 1/2" length offers maximum holding power and versatility across different assembly depths
• Raised round head with collar design increases surface contact and distributes pressure evenly, minimizing material damage
• Compliance with RoHS 3 and REACH regulations guarantees safe, environmentally responsible use in global markets

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common industrial challenges like tool-free maintenance and vibration resistance. The knurled head provides exceptional grip, enabling quick adjustments in tight spaces without specialized tools, while the UNC coarse threads and Class 2A fit ensure rapid assembly and reduced cross-threading risks. With a 70,000 psi tensile strength, it withstands dynamic loads in machinery, electronics, and automotive assemblies, offering a durable fastening solution that minimizes downtime and enhances operational efficiency in demanding applications.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a 1/4"-20 thread size, coarse spacing, and Class 2A thread fit for precise dimensional accuracy. It meets RoHS 3 (2015/863/EU) with exemption 6(a)-I and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for industrial use where regulatory standards are critical.