The Hy-Lok tube fitting design is functionally interchangeable with any other major brand of  tube fittings.  The definition of functional interchange is an existing swaged ferrule set and nut on the end of a tube from one manufacturer can be mated to the body of the other manufacturer with no performance concern.  The basis for this is in the fact that the common machined area inside the fitting body is the 40° cone angle where the ferrules insert.  This common thread allows total interchange and performance, not to mention COST SAVINGS.

Functional interchange is separate and apart from intermixing.  Intermixing is using any combination of the four components (nut, front ferrule, back ferrule, body) from the two manufacturers to assemble a connection.  Due to specific design differences between manufacturer's of  tube fittings from 1/2" O.D. size and up, individual components cannot be randomly intermixed to create an assembly.

HOWEVER, Hy-lok’s two ferrule design being widely accepted, it is totally interchangeable and individual component intermixable with the other most recognized brands in the industry.