S-98816A216 4-40 x 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual torque application with knurled round head design for superior grip without tools
• Corrosion-resistant performance through brass construction ideal for various industrial environments
• Reliable thread engagement with Class 2A fit UNC coarse threading ensuring secure fastening
• Optimized mechanical strength featuring 50,000 psi tensile strength and Rockwell B78 hardness
• Quick installation and adjustment through fully threaded 1/4" length and right-hand thread direction
• Stable seating surface provided by raised head profile with integrated collar
• Environmental compliance meeting RoHS 3 standards for regulated applications

Professional Applications & Engineering Value

This 4-40 UNC brass thumb screw delivers exceptional value in applications requiring frequent adjustments and reliable clamping force. The knurled head texture provides maximum finger grip for high-torque manual tightening in confined spaces where tools are impractical. Made from durable brass material, it offers natural corrosion resistance for electronics, instrumentation, and marine applications. The coarse UNC threading with Class 2A fit ensures rapid installation and vibration resistance in industrial equipment, panel fastening, and prototype development. The fully threaded design maintains consistent engagement while the raised head profile with collar creates a stable bearing surface, preventing damage to sensitive materials during repeated use cycles.

Specification Summary & Compliance

This thumb screw features precision 4-40 UNC coarse threads with Class 2A thread fit for consistent engagement and 1/4" fully threaded length. Manufactured from brass with Rockwell B78 hardness and 50,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) regulations under exemption 6(c) for lead in copper alloys, ensuring environmental responsibility while maintaining performance standards for industrial fastening applications.