This document introduces Eaton Standard NB200 nut and NB300 front ferrule, core components of American JIC 37° Triple-Lok hydraulic tube fittings. NB200 is a hexagonal internally threaded nut (UNF fine thread, carbon/stainless steel) for torque transmission and tubing fixation. NB300 is a single front ferrule with a 37° cone and cutting edge, achieving sealing and gripping when tightened, with high-pressure and vibration resistance. It also covers size matching, comparisons with Metric 24° cone fittings, and key selection/installation tips for hydraulic, oil & gas, and marine applications.

If you work in hydraulics, you know that crimping is the most critical part of making a hose assembly.At RUIHUA HARDWARE, we see too many failures caused by uneven crimping—and that’s a much bigger problem than it looks. 

Hydraulic systems are the lifeblood of critical machinery. The reliability of every hydraulic fitting directly impacts system safety and performance. During installation and maintenance, a deceptively simple question arises: When tightening a hydraulic fitting, should you trust the precise click of

In extreme environments of high temperature, high pressure, and corrosion, traditional sealing methods often fail. Enter conical sealing technology—where metal meets metal in a direct, engineered union. This is the hardcore solution for absolute containment

Are you struggling with persistent hydraulic issues that hamper your productivity?A persistent hiss or drip of hydraulic fluid at connection points, creating mess and waste?Costly downtime during maintenance because new couplers won't fit the old ones?