the partial view in accordance with fig1 shows , in outline , an electrical connector ( 10 ) in accordance with din 41 612 , in which the mounting distance ( 13 ) between the mounting bores in both the flanges ( 11 and 12 ) of the electrical connectors is , for example , 90 mm . the mounting depth ( 18 ) for electrical connectors ( 10 ) is defined by the distance between mounting surfaces of mounting flange ( 21 ) of both mounting bars ( 20 ) and the mounting plane of the front panel of the subrack . the distance of mounting depth ( 18 ) is , according to the size of the modules , 175 . 24 mm , if the modules support terminal strips in accordance with din 41 612 . mounting bars ( 20 ) are formed identically , however , with reversed ends , that is to say , rotated longitudinally 180 °, and connected with side walls ( 30 , 40 ) of the subrack . moreover , as the section in accordance with fig3 shows , blind - end bores ( 27 ) or blind - end threaded bores can be placed in the end areas . the mounting screws are inserted through bores ( 41 ) in side walls ( 30 , 40 ), and are screwed into blind - end bores ( 27 ) or blind - end threaded bores of mounting bars ( 20 ). in the example of construction given , mounting bars ( 20 ) serve simultaneously as rear cross - pieces of the subrack . mounting bars ( 20 ) can , however , also be additionally provided to rear cross - pieces ( 46 ), and connected with these as shown in fig4 . mounting bars ( 20 ) are each provided with two mounting flanges ( 21 and 22 ), which are positioned at right angles to one another , and are fitted to the two sides ( 23 and 24 ) adjacent one another of the essentially rectangular mounting bar ( 20 ), as is seen in fig3 . in this way , mounting flange ( 21 ) is fitted to side ( 23 ) and mounting flange ( 22 ) to side ( 24 ). sides ( 25 and 26 ) form contact spaces , which abut fitted bars ( 31 and 32 ) connected to side walls ( 30 , 40 ), to non - rotatably secure mounting bars ( 20 ). in the embodiment for electrical connectors ( 10 ) in accordance with din 41 612 , mounting bars ( 20 ) are so mounted that mounting flanges ( 21 ) are aligned opposite to one another , and , with the mounting surfaces turned to the forward side , form a rear mounting plane . the lateral displacement ( 34 ) of the mounting surfaces ( 44 ) of mounting flange ( 21 ) to a parallel corresponding plane ( 43 ) intersecting the central axis of blind - end bores ( 27 ) is thereby so selected , that mounting depth ( 18 ) occupies the specified distance of 175 . 24 mm or 235 . 24 mm , between mounting surface ( 44 ) and the mounting plane 50 of the front panel of the subrack . sides ( 25 ) of mounting bars ( 20 ) abut bars ( 31 and 32 ) connected to side walls ( 30 , 40 ), to non - rotatably secure mounting bars ( 20 ) in this first position . as fig2 shows , both mounting bars ( 20 ) may be detached from the side walls ( 30 , 40 ), rotated 90 ° around their longitudinal axes and fastened to side walls ( 30 , 40 ) again in the same manner as described above . the upper mounting bar ( 20 ) is thereby turned in a clockwise manner , and the lower mounting bar ( 20 ) is turned counterclockwise around the longitudinal axis . in this way , the second position , in which mounting flanges ( 22 ) are adjusted toward one another , is achieved , and , with the mounting surfaces turned toward the forward side , mounting depth ( 19 ) for electrical connectors ( 14 ) is defined in accordance with din 41 617 . the distance of mounting depth ( 19 ) for electrical connectors ( 14 ), from the rear mounting plane to the front panel , is accordingly spaced at 170 . 6 mm or 230 . 6 mm . the lateral displacement ( 35 ) of the mounting surfaces ( 45 ) of mounting flange ( 22 ) to a parallel corresponding plane ( 33 ) intersecting the central axis of blind - end bores ( 27 ) or blind - end threaded bores is correspondingly greater , in order to maintain the necessary smaller distance of mounting depth ( 19 ) for electrical connectors ( 14 ) from the mounting plane for the front panel , in accordance with din 41 617 . the difference of the displacements ( 34 and 35 ) of mounting flanges ( 21 and 22 ) corresponds approximately to the difference of the distances of mounting depths ( 18 and 19 ) for electrical connectors ( 10 and 14 ) from the mounting plane to the plane of the front panel in accordance with din 41 612 and din 41 617 . since electrical connectors ( 10 and 14 ), in accordance with din 41 612 and din 41 617 , also have varying mounting distances ( 13 and 17 ) between the mounting bores in their flanges ( 11 , 12 ) and ( 15 , 16 ), mounting flanges ( 21 and 22 ) must also undergo an adjustment . both mounting flanges ( 21 and 22 ) of mounting bar ( 20 ) exhibit a series of threaded apertures ( 28 and 29 ), which are placed at a specified spacing of , for example , 5 . 08 mm . the central axes of threaded apertures ( 28 ) in mounting flange ( 21 ) are parallel to plane ( 33 ) intersecting the central axis of blind - end bores ( 27 ) or blind - end threaded bores , at a distance ( 37 ), which is so measured that , with observation of the mounting points of mounting bars ( 20 ) at side walls ( 30 , 40 ), and lateral displacement ( 34 ) of mounting flange ( 21 ), the rows of threaded apertures ( 28 ), in the position of mounting bars ( 20 ), occupy , in accordance with fig1 mounting distance ( 13 ) for electrical connectors ( 10 ), in accordance with din 41 612 . the central axes of threaded apertures ( 29 ) in mounting flange ( 22 ) are parallel to plane ( 43 ) intersecting the central axis of blind - end bores ( 27 ) or blind - end threaded bores at a distance ( 36 ) which is so measured that , with consideration of the same mounting points of mounting bars ( 20 ) to side walls ( 30 , 40 ), and of lateral displacement ( 35 ) of mounting flange ( 22 ), the rows of threaded apertures ( 29 ) in the position of mounting bars ( 20 ), in accordance with fig2 occupy the mounting distance ( 17 ) for electrical connectors ( 14 ) in accordance with din 41 617 . as can further be seen from fig2 mounting bars ( 20 ) are fastened non - rotatably with their sides ( 26 ) abutting support bars ( 31 and 32 ) of side walls ( 30 , 40 ). the difference of the distances ( 36 and 37 ) corresponds to half the difference of mounting distances ( 13 and 17 ). sides ( 24 and 25 ) of mounting bars ( 20 ), in accordance with fig3 exhibit reception grooves ( 38 and 39 ), which can accommodate marking strips . mounting bars ( 20 ) are cut to length , as desired , from sections of a corresponding profile line , in which blind - end bores ( 27 ) and blind - end threaded bores , and the series of threaded apertures ( 28 and 29 ), are subsequently placed .