O-Ring Boss fittings (ORB) are precision-engineered hydraulic hose fittings designed to create what kind of connections?

• A. ORB
• B. Crimp fittings
• C. JIC
• D. BSP

Answer: (A)

The essential idea is that ORB fittings seal with an O-ring. O-Ring Boss fittings are designed so an O-ring sits in a groove on the sealing face, and when you tighten the nut, that O-ring is compressed between the mating surfaces to form a leak-tight hydraulic connection. This true O-ring seal is what defines this family of fittings, distinguishing them from other sealing methods.

Because the seal relies on the O-ring, these connections don’t use a flare or a crush gasket. That’s why ORB fittings are distinct from crimp fittings (which rely on deforming the hose), JIC fittings (which seal on a 37° flare surface), and BSP fittings (which use different thread forms and sealing methods). The result is a compact, reliable seal suitable for hydraulic hoses where a leak-tight connection is crucial.