metal tubes , such as the small diameter metal tubes used in hydraulic braking systems , are connected to hoses also used in such systems by fittings which are configured to receive radially projecting beads on the metal tubes . each of the fittings includes a body portion with a bore therethrough and a crimping collar which is unitary with the body portion . the body portion receives an insertion end of the tube therethrough , which insertion portion projects into the unitary crimping collar . a radially extending bead on the tube is received in a recess adjacent the bore through the body portion . in one embodiment , the tube is held in place by another bead which is seated in another recess at the opposite end of the bore .