The Series 1404-SS Straight Male NPTF x Female NPSM hydraulic adapters, made from high-quality stainless steel, are essential components designed to create secure connections in hydraulic systems for the transfer of fluids and gases. Utilizing the National Pipe Taper (NPT) standard, these adapters feature tapered threads that seal through thread deformation, creating a reliable metal-to-metal connection when tightened. The nominal pipe size can be determined by measuring the thread diameter and subtracting 1/4". In contrast, NPSM (National Pipe Straight Mechanical) adapters have straight threads and are designed for sealing using a flat surface or O-ring rather than relying on deformation. This distinction means that while NPT and NPSM fittings can be used together in some systems, they are not interchangeable without proper adapters. Furthermore, NPTF (National Pipe Tapered Fuel) fittings also use tapered threads but have a slightly different design that allows for a leak-tight seal without relying on deformation, making them suitable for fuel applications. These adapters are ideal for professionals seeking efficient and reliable hydraulic solutions in various applications.