A quick coupling for profiled or threaded terminals, comprising: - a substantially tubular main body internally delimiting a passage conduit for a fluid and extending along a main axis (X-X), the main body comprising a first end configured for being removably coupled to a terminal and a second end configured for being coupled to a circuit, - a jaw engaged to the main body, the jaw operating between a first unhooked position from the terminal, in which it does not constrain the terminal to the quick coupling, and a second hooked position to the terminal in which it constrains the terminal to the quick coupling, wherein said jaw comprises at least a pin housed in a radial seat defined at the first end of the main body, said at least a pin being configured for radially sliding internally of said radial seat, - at least an activating device (16, 17) operatively engaged with said at least a jaw for determining passage of the jaw between the first position and the second position, said at least an activating device (16, 17) comprising an auxiliary body configured for operating on said at least a pin, - hooking/unhooking devices (15, 18, 21, 31) configured for operating on the auxiliary body so as to regulate the relative axial position between the auxiliary body and the main body; wherein the hooking/unhooking devices (15, 18, 21, 31) comprise a plurality of spheres configured for operating between a first configuration in which they block the relative axial movement between the auxiliary body and the main body and a second configuration in which they enable the relative axial movement between the auxiliary body and the main body, the spheres being housed internally of housing seats fashioned in the main body and being configured for radially sliding internally of said housing seats in order to pass between said two configurations; wherein said at least a pin has a profiled or threaded radially internal end that is configured for being coupled to the profiled or threaded terminal; wherein in the second position of the jaw the profiled or threaded radially internal end of the pin is engaged to the terminal so as to retain the terminal in engagement to the quick coupling; wherein the profiling or threading of the radially internal end of said at least a pin is an integral part of the pin and extends over a whole base of the pin. - a substantially tubular main body internally delimiting a passage conduit for a fluid and extending along a main axis (X-X), the main body comprising a first end configured for being removably coupled to a terminal and a second end configured for being coupled to a circuit, - a jaw engaged to the main body, the jaw operating between a first unhooked position from the terminal, in which it does not constrain the terminal to the quick coupling, and a second hooked position to the terminal in which it constrains the terminal to the quick coupling, wherein said jaw comprises at least a pin housed in a radial seat defined at the first end of the main body, said at least a pin being configured for radially sliding internally of said radial seat, - at least an activating device (16, 17) operatively engaged with said at least a jaw for determining passage of the jaw between the first position and the second position, said at least an activating device (16, 17) comprising an auxiliary body configured for operating on said at least a pin, - hooking/unhooking devices (15, 18, 21, 31) configured for operating on the auxiliary body so as to regulate the relative axial position between the auxiliary body and the main body; wherein the hooking/unhooking devices (15, 18, 21, 31) comprise a plurality of spheres configured for operating between a first configuration in which they block the relative axial movement between the auxiliary body and the main body and a second configuration in which they enable the relative axial movement between the auxiliary body and the main body, the spheres being housed internally of housing seats fashioned in the main body and being configured for radially sliding internally of said housing seats in order to pass between said two configurations;