Nut (Fractional Tube)

The Nut (Fractional Tube) is a core component of a double-ferrule instrumentation fitting designed to provide the mechanical force necessary to secure fractional-sized tubing. When tightened onto the fitting body, the nut drives the front and back ferrules forward, creating a leak-proof, high-pressure seal through a controlled, torque-free swaging action. It is precision-machined with internal threads and a smooth internal geometry to ensure consistent alignment and prevent galling during installation. Typically manufactured from 316 stainless steel and often silver-plated on the internal threads to reduce friction, these nuts are essential for maintaining system integrity and allowing for repeated reassembly in high-pressure fluid systems, chemical processing, and analytical instrumentation.