Page 138 - Illustrated Pocket Dictionary of Chromatography

NUT 137

The photograph shows various nut-ferrule assemblies that have been set into the
same-make union. Note the difference in the length and pitch of the nut threads
(this makes nuts from one manufacturer incompatible with others). Also note the
distance that the tubing extends from the ferrule is different. Obviously, a nut-
ferrule couple fourth from the top will not seal well in a union design for a nut-
ferrule set shown second from the top (different tubing set distances, different
ferrule lengths, and different threading of the nut).

There are numerous nut-ferrule combinations. Pictured here are one-piece and
two-piece assemblies.