S-92421A537 1/4"-20 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with a knurled round head and flared collar design for superior, slip-resistant grip without tools
• Durable and corrosion-resistant performance thanks to the solid brass construction, ideal for various environmental conditions
• Quick and reliable installation with UNC 1/4"-20 coarse threading and Class 2A fit, ensuring easy starts and consistent engagement
• Maximum fastening versatility from the fully threaded 1/2" length, providing full grip along the entire shank
• Secure and stable seating due to the flared collar, which helps distribute load and prevent over-tightening
• Compliance with stringent environmental standards, being RoHS 3 and REACH compliant for safe use in regulated industries
• Broad compatibility with right-hand thread direction and standard inch measurements for seamless integration into existing assemblies

Professional Applications & Engineering Value

This 1/4"-20 brass thumb screw is engineered to address common challenges in industrial settings where frequent adjustments and tool-less access are critical. The knurled round head and flared collar provide exceptional grip and stability, reducing the risk of stripping and enhancing user safety during manual operation. Made from brass, it offers inherent corrosion resistance and electrical conductivity, making it suitable for electronics, machinery panels, and laboratory equipment. The UNC coarse thread and Class 2A fit ensure quick assembly and reliable performance in vibration-prone environments, while the fully threaded design allows for adjustable clamping force. Ideal for access panels, fixtures, and prototypes, this screw streamlines maintenance and improves operational efficiency.

Specification Summary & Compliance

This thumb screw adheres to inch system dimensions, featuring a 1/4"-20 UNC coarse thread with Class 2A tolerance for precise fit and interchangeability. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for global industrial applications. The product meets standard specifications for right-hand thread direction and fully threaded length, providing consistent quality and reliability.