(57) A hinge for metal door and window units comprises: two hinge bodies (2, 3) each presenting
a cylindrical hole (6, 7) and a flap (8, 9) by which it is secured to the respective
frame of a door or window unit (10); a hinge pin (17) that can be inserted coaxially
into the holes (6, 7) to allow the bodies (2, 3) to turn relative to each other about
a central axis (18) of the pin (17) itself; and fastening elements (11) to fix the
flaps (8, 9) to the respective frames of the door or window unit. Each of the hinge
bodies (2, 3) is made in a first and a second part (21, 22) which can be fitted together,
the first part (21) constituting a first element presenting the respective hole (6,
7) and the second part (22) constituting a second element presenting the respective
securing flap (8, 9) .
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