Abstract: A swivel coupling used to connect metal tubes to externally threaded fittings in hydraulic systems includes a swivel nut which is attached to a tail piece by deforming a collar portion of the swivel nut into a locking relationship with the tail piece. This is accomplished by having facing and aligned shoulders on the swivel nut and on the tail piece which prevent the swivel nut from axially disengaging from the tail piece when the swivel nut is rotated to thread onto the threaded fitting. The tail piece has a flat end face which engages a flat end face on the fitting so that a leak-proof joint is formed between the tube and the fitting. The nut includes a frusto-conical portion that is engaged by a frusto-conical die surface on a split die ring in order to cam the collar portion toward the tail piece and align the respective shoulders thereof.

Abstract: A hose coupling includes a crimping collar which is crimped about a reinforced rubber hose with an array of crimps which are offset in both the axial and circumferential directions. The array of the crimps thus assumes a "checkerboard" configuration. In accordance with the method of producing the array of crimps, the crimping operation is performed using first and second die segments wherein the die segments have ribs for forming the crimps, which ribs are placed at different axial locations. The die segments alternate; consequently, the resulting crimps are spaced both axially and circumferentially.