O-ring boss (ORB) fittings are a type of hydraulic fitting that uses an o-ring to create a seal between two connecting components. The o-ring is seated in a groove in the face of the male fitting, and it is compressed when the two fittings are tightened together. This creates a reliable, leak-free seal that is ideal for high-pressure hydraulic applications.

ORB fittings are commonly used in hydraulic systems, particularly in applications where high pressures are involved. They are often used in applications such as pumps, cylinders, and valves. The fittings are available in various shapes and sizes, including straight, elbow, and tee configurations.

NJ ORB fittings meet SAE J1926-1 standard, quite popular in North American, especially 6400, 6401, 6402, 6405, 6408, 6408-HHP, 6410, 6420, 6425, 6801, 6802, 6803, 6804, 6805, 6806, 6807, 6809, 6810, 6815, 6832, 6835, 6900, 6901, 6902 and ect.