A locking assembly for a ventilating window having a sash arranged to be openable with respect to a main frame by pivotal movement about a pivot axis parallel to a pair of opposed sash members, said locking assembly comprising: a strike plate with at least one stationary locking member secured to a main frame member opposite one of said pair of sash members, a casing secured to said one sash member opposite the strike plate, at least one pawl member arranged in said casing to be movable between a locking position, in which it is in locking engagement with said stationary locking member and an unlocked position, in which it is released from said locking engagement to allow opening of the window, the pawl member moving along first guide means in the casing, a locking control mechanism (43,44,45) arranged in said casing to control the movement of the pawl member(s) between said locking and unlocked positions, said locking control mechanism being operable by an operator member accessible from the inside of the window via at least one actuator slide displaceable in second guide means in the casing from a first end position defining the unlocked position of the pawl member to a second end position defining the locking position of the pawl member and vice versa, the operator member being connected with the actuator slide to occupy two distinct positions corresponding to the end positions of the actuator slide, a hinge being adapted for connecting the operator member to the top sash member, said hinge consisting of two hinge parts (91,92), which are connectable to the operator member and the top sash member, respectively, and which are interconnected by means of a pivot projecting through bent back edges (94,95) of the two hinge parts, characterized in that the locking assembly comprises a first part, which is moveable in relation to a second part of the locking assembly with a first surface of the first part facing a second surface of the second part, where at least the first surface is provided with a liner preventing direct contact between the first and second surfaces, that the strike plate is made entirely from plastic, and that the pivot is provided with a plastic coating preventing direct contact between the pivot and the hinge parts (91,92). a strike plate with at least one stationary locking member secured to a main frame member opposite one of said pair of sash members, a casing secured to said one sash member opposite the strike plate, at least one pawl member arranged in said casing to be movable between a locking position, in which it is in locking engagement with said stationary locking member and an unlocked position, in which it is released from said locking engagement to allow opening of the window, the pawl member moving along first guide means in the casing, a locking control mechanism (43,44,45) arranged in said casing to control the movement of the pawl member(s) between said locking and unlocked positions, said locking control mechanism being operable by an operator member accessible from the inside of the window via at least one actuator slide displaceable in second guide means in the casing from a first end position defining the unlocked position of the pawl member to a second end position defining the locking position of the pawl member and vice versa, the operator member being connected with the actuator slide to occupy two distinct positions corresponding to the end positions of the actuator slide, a hinge being adapted for connecting the operator member to the top sash member, said hinge consisting of two hinge parts (91,92), which are connectable to the operator member and the top sash member, respectively, and which are interconnected by means of a pivot projecting through bent back edges (94,95) of the two hinge parts, characterized in that the locking assembly comprises a first part, which is moveable in relation to a second part of the locking assembly with a first surface of the first part facing a second surface of the second part, where at least the first surface is provided with a liner preventing direct contact between the first and second surfaces, that the strike plate is made entirely from plastic, and that the pivot is provided with a plastic coating preventing direct contact between the pivot and the hinge parts (91,92).